BI_Extension Bible_2018(1)

EXTENSIONS

BIBLE 2018

The ultimate guide to adding more BuildItBROUGHT TO YOU BY...
space and value to your home

07

45

08

BuildItBROUGHT TO YOU BY...

www.self-build.co.uk

03

EXTENSIONS 04
Make sure your project maximises the 12
property’s potential and comes in on time and 23

on budget with our essential guide

INSPIRING REAL HOMES
These innovative schemes elevated humble

dwellings into stunning, light-filled living
spaces that stand out from the crowd

PRODUCTS IN FOCUS
From structural esssentials through to stunning
glazing systems, these materials and services will

get the best out of your building project

DAVID BUTLER LOFTS 32
Expert tips on how to up your property’s value by 37
Build It Above & 40
cover: Build transforming untapped roof space into bright
EDITORIAL Digital account manager It readers and airy extra rooms or useful storage area 44
Stephen 49
Book editor Emily Smith Andrew Brandon 020 3627 3228 Cambell INSPIRING REAL HOMES 50
and Laura Thanks to creative thinking and careful planning,
Editor Chris Bates PUBLISHING Hilton have
Assistant editor Sofia Delgado successfully these beautiful loft conversion projects
Contributing editor Rebecca Foster Managing director transformed are shining success stories
Calum Taylor a rundown
Digital editorial assistant Victorian PRODUCTS IN FOCUS
Finance director property Make the most of those tricky sloping angles by
Shona Jackson into a specifying fixtures that utilise dead spaces and help
Katherine Taylor modern
Art editor David Flint family home to bring light and volume to this storey
Marketing director thanks to a
ADVERTISING SALES Claire Drakeford striking new BASEMENTS
Advertising director Accounts Sinead Charles extension Digging down could be the ideal route to
extending your home and adding more valuable
Nick Gillam 020 3627 3245 020 3627 3253
living space for your family to enjoy
Account manager
INSPIRING REAL HOMES
Sophie Gardiner 020 3627 3263 Published by Castle Media Ltd, Subterranean schemes embrace the
challenges of excavating a below-ground level
Gallery sales Peasemore House, Newbury, to achieve truly remarkable schemes

Richelle Rimmer 020 3627 3251 Berkshire, RG20 7JH PRODUCTS IN FOCUS
Whether you’re looking to inject light into a dark
Emily Neil 0203 553 2378 © Castle Media Ltd basement or fit out an impressive audio system,
these elements should be your first port of call

All the content in this book is governed by copyright and may not be CONTACTS 54
reproduced in any form without the prior written permission of the publisher. A directory of suppliers featured in this guide
Information published in this book is intended to provide general guidance
only, and the publishers do not accept liability for any loss or damage arising
from use of this information. Anyone contemplating a home building project
should seek appropriate professional advice before commencing.

c EXTENDING
YOUR HOME

IF YOU’VE GOT SPACE IN YOUR GARDEN, THEN
AN EXTENSION COULD BE THE BEST ROUTE TO
THE LIVING SPACE YOU’VE ALWAYS WANTED. FROM
PRODUCTS AND MATERIALS THROUGH TO COSTS
AND PLANNING, HERE’S WHAT YOU NEED TO KNOW
TO ENSURE YOUR PROJECT RUNS SMOOTHLY

EXTENSIONS 05

KEY CONSIDERATIONS

Awell-considered extension The best route Above & left: A
will breathe new life into a to success is contemporary-
building and could be the best to gain a clear looking 100m2
route to the size of property understanding extension by
you’re after without having to go through of what elements Gregory Phillips
the rigmarole of moving house. Before could end up being Architects makes
going ahead with your venture, here contentious. Start a striking contrast
are some initial things to carefully think by looking into to the grade II listed
about to ensure you make the most whether your house it adjoins. It
of your home improvement project. property has includes a living-
any protections kitchen space on
Budget & value in place, such as the upper floor
Before you get carried away with listed status or and an indoor
researching design ideas and product being positioned swimming pool
options, be sure to establish exactly how in a conservation on the lower storey
much you can afford to spend and if the area or area of
price of the works is going to equal the outstanding they should, both in terms of quality and
value it will ultimately add to your house. natural beauty. timing. Many homeowners choose to
If you’re seeing this as an opportunity to Investigate take on the role of project manager, but
create your forever home, then finished whether any if you do this then make sure you really
market price might not be a concern, but nearby extension understand the time and stress this can
it’s always sensible to make sure you’re proposals have add to your everyday life during the works
getting the best costs for what will be been refused by – especially if you work fulltime.
a considerable expense. Check out the council and, if
whether any similar-looking houses so, then why. Plus, check if what you’re
nearby have been extended and how after could be built under permitted
much they are valued at in comparison development (PD) rights. For more info
to your property as it currently is. For about planning, turn to page 9.
more detailed price info, go to page 10
for example project cost breakdowns. Project schedule & management
Most extensions will follow a similar
When you brief your designer, be clear flow in terms of what happens when,
and realistic about how much you can but remember that bumps do occur,
afford to spend – and remember to leave often causing unexpected delays and
money for a contingency fund in case of expenses. Be as organised as you can be
unexpected costs along the way. A good by breaking the works down into the key
professional will come up with a scheme stages and understanding how long each
that maximises potential wow factor as one is likely to take. This will help you to
well as your pennies. But it’s always best best schedule when different trades
to double check when presented with need to be in as well as accurately predict
plans – ensure they’re making the most timings for materials deliveries, so you
of your budget rather than pushing their don’t store products on site for too long
own design preferences, for instance. before they’re needed. For a clearer
picture, don’t miss the example schedule
Local planning rules we’ve put together on page 9.
While some homeowners experience a
smooth journey to achieving the green Regardless of how organised you are
light from their local authority, others face at the planning stage, you’ll always need
hurdles from the likes of fussy planning to allocate someone who will regularly be
officers and neighbours with objections. on site to make sure things progress as

06 EXTENSIONS

Single storey in the most suitable style for the addition.
Terrace and semi-detached properties
Extending your ground floor out into often have redundant space at the edges
the back garden is a popular way of that can be better utilised with a side-
creating spacious open-plan kitchen- return extension, for instance. If you’ve
living zones. You might even be able got more room to play with then a new
to do it under permitted development area that feels more separate from the
rights, which would mean no need to house could be best, perhaps linked to
submit a formal planning application. the original with a glazed connection.

The shape and space available to
extend into will have a key role to play

Left & above: This large Victorian villa has benefited from a new
modern-style rear extension by Lipton Plant Architects. Ample
glazing and tall ceilings make the addition feel bright and airy

Double storey FRENCH + TYE
Creating extra room across several
levels will maximise the potential
for extra floorspace in your home –
especially useful if you don’t want to
take too much away from your garden.
It could be good value for money, too,
because while you’ll need to pay for
twice the amount of materials, the
groundworks and roofing will cost
around the same as if you were only
extending on the lower level.

Some smaller multi storey additions
at the back of a house will fall under
permitted development rights, but
there are various restrictions, including
how tall they can be. So it’s always
worth thoroughly investigating the
best solution for your property.

Right: A small semi-detached Victorian
house has undergone a dramatic change
thanks to MW Architects. The two storey
extension is made predominantly of glass
and features large sliding doors

Glazed HEATHER HOBHOUSE EXTENSIONS 07
Many homeowners choose to include
large spans of glazing in their home Hut Architecture was the design brains behind
extension, ideal for creating a strong this sunken glass box extension, which brings
connection with the garden to boost natural light and wow factor to the listed cottage
that indoor-outdoor feel. It also helps
to maximise the amount of daylight
that pours into the new space and
through into the original building.

Whether you’re looking to build a
modern-looking glass box with
frameless corners that seem to defy
gravity or more of a conventional
extension that features large glazed
doors and rooflights, these minimalist
designs are great for highlighting
period character and are often
favoured by planners. You’ll need to
pay special attention to positioning to
make the most of daylight. There are
many super efficient glazing products
available that will enhance thermal
efficiency, but be sure to design in
suitable precautions to ensure
the room doesn’t overheat.

Conservatories & orangeries
The key difference between glazed
extensions and conservatories is that
the latter remain separate from the
rest of the house, meaning that
planning rules and Building Regs
aren’t as strict. In the past this meant
they could be built to poor standards
and gained somewhat of a bad
reputation for temperature extremes.
However, modern advancements in
glazing technology has resulted in
plenty of specialist companies out
there producing high quality results
suitable for 21st century living. This
means that conservatories and
orangeries can have more of a link
with the rest of the house, creating
open-plan spaces. There is also a
plethora of design options available,
both contemporary and traditional.

Right: A new large conservatory by Vale
Garden Houses hosts a living-dining
space in this period property

08 EXTENSIONS

Size & styleJACK HOBHOUSEof how much glass you’d like to include,
The most suitable careful consideration is needed to ensure
look and shape for you get the right result. Think about
your extension will where the best placements are to frame
come down to your views out onto the garden or over
brief, what will particularly impressive surroundings
work with the further afield. Investigate how light moves
original property, across the plot and what locations will
as well as how draw maximum natural light inside; but
much room there be careful to avoid overheating issues
is to play with. The (especially on south-facing elevations).
addition shouldn’t
dominate the main When placing windows on higher
building, which is storeys, consider whether they will cause
why lower ridge overlooking issues – both in terms of
heights and flat neighbours seeing inside your home and
roofs are favoured. you theirs. If it’s a particularly exposed
position, then cleverly designed solutions
If you’re creating – such as bespoke windows set at
large openings unconventional angles – can be the best
between the solution for bringing in plenty of natural
original building light without compromising privacy.
and the new
DESIGN & ASSESSMENT space, establishing
a seamless
Above & far right: Finding a designer transition can bePETER LANDERS
This late Georgian very effective; for instance, try to keep
property now On a simple project, you may be able to floor levels and ceiling heights the same.
features a 65m2 put together your own design with the In terms of external appearance, while
ground floor advice of a structural engineer. For more matching the original building’s material
extension and new complex extensions, you could use a palette can seem like the best way to
100m2 basement. design and build specialist to complete create something that feels right, be
Studio Octopi came the whole scheme, or work alongside a aware that this is hard to do well on a
up with the design, professional designer or architect at the period property and can leave you with
which includes wide planning stages. Whatever route you an awkward pastiche. Instead, something
spans of glazed take, you’re going to be investing a lot strikingly different
sliders and roof of trust, time and money in whoever you and modern will
windows. Right & employ, so it’s worth doing your research be an attractive
above right: What and finding the right professional for you. contrast, working
was previously a to complement and
compact, three A good starting point for finding a highlight the main
bedroom end-of- designer is via the various accreditation property’s character.
terrace is now a five schemes. Among the professional bodies
bedroom family offering searchable online lists are the Maximising
home. Chris Dyson Royal Institute of British Architects daylight
Architects came up (RIBA), the Chartered Institute of Large spans of
with the double- Architectural Technologists (CIAT) and glass are a popular
height extension, the Institution of Structural Engineers feature in extension
which is clad in (ISE). See if they’ve completed projects projects – whether
charred cedar on similar properties to yours and in the achieved by
weatherboarding kind of style you’re keen on, take up installing glazed
recommendations and – if at all possible doors and overhead
– visit finished houses, too. windows, or through
a completely glazed
addition. Regardless

EXTENSIONS 09

WHAT CAN I BUILD UNDER RULES & REGULATIONS
PERMITTED DEVELOPMENT?
Will I need planning permission? Building Standards if your house is in
If you’re sure your project fits under PD rights, you can start Scotland), and there are two main ways
work without making a planning application (or paying the Technically, all extension projects require to secure it. One option is to submit
relevant fee). Here’s a basic outline of what’s allowed; for a planning permission; but many homes structural drawings to building control for
full list of criteria go to www.planningportal.co.uk. already have it thanks to permitted full approval, which gives you peace of
l Extensions and outbuildings must not exceed 50% of development (PD) rights. These come mind the detailed design meets the
with a number of restrictions that must minimum standards. Alternatively, you
the total land area around the original house (as built or be followed, such as size and height can serve a building notice 48 hours
as it stood on 1st July 1948). thresholds – see the box opposite for ahead of breaking ground. In both cases
l You cannot build forward of the main elevation (or to more on this. In some circumstances the project will be checked by an
the side where it fronts the highway). PD rights will have been removed, for approved inspector at key stages of the
l S ingle storey rear extensions must be no more than 3m instance if the house has a protected build. If they’re happy then you’ll be issued
deep for terraces and semis, or 4m for detached houses status of some kind (ie if it’s listed or with a completion certificate at the end of
(the limits are currently doubled to 6m and 8m respectively positioned in a designation zone such as the project – a valuable document that
in England, subject to a prior approval procedure). an area of outstanding natural beauty). proves the work has been completed in
l M aximum height of 4m for a single storey rear extension. accordance with the Building Regs.
Additions within 2m of a boundary should have a If you need to make a full application,
maximum eaves height of no more than 3m. then it’s worth taking a look at the Local
l S ide extensions must be single storey, no higher than 4m Plan, which will have an influence on your
and no greater than half the width of the original building. planning department’s final decision on
l M ulti storey extensions should have a maximum eaves the outcome of your application. Be
and ridge height no taller than the existing house, and aware the language in these documents
must have a matching roof pitch. can be vague and different planners
l A multi storey addition can’t extend beyond 3m of the rear will interpret things differently.
of the original house or be within 7m of a rear boundary.
l Windows on upper floors of side elevations must be Another rule to bear in mind is the
obscure-glazed and non-opening (unless the openable Party Wall Act, which means you must
part is at least 1.7m above floor level). inform neighbours of your plans if they
l E xternal materials used must be similar in appearance to involve work on a joint wall, boundary or
the existing house (unless you’re adding a conservatory). below/near their property’s foundations.
If you want to be certain your scheme is classed as PD, you
can apply for a Certificate of Lawful Development. Building Regulations
Most extension projects will require
Building Regulations approval (or

Project schedule: Flat roof extension

This schedule Building Phase Week 1 2 3 4 5 6 7 8
accompanies our
single-storey, flat Commencement
roofed extension Foundations & footings
project (see Oversite & slabbing
page 11); but it Brickwork shell
reflects the kind Roof structure
of construction Roof covering
programme that Internal preparation
many similar Structural openings
projects would First fix
follow. We’d expect Plastering
the 20m2 scheme Second fix
to be completed Internal decoration
in eight weeks – External decoration
including fit-out to
a basic standard.

10 EXTENSIONS

EXTENSION COSTS

If you’ve got the garden space, then an BENCHMARK COSTS:
extension can be a great way to improve CONSERVATORY
your home and increase its value.
Location Midlands Type of project Conservatory Floorspace
As a rule, prices can start from as little added 20m2 Build cost £19,588 VAT £3,918 Total cost
as £1,000 per m2 for a straightforward £25,506 Total cost per m2 £1,175
conservatory; while a fairly basic single-
storey addition that’s fully integrated If you’re looking for a cost-
into the main house might begin at effective route to increasing
your home’s living space, then
DAVID BUTLER a conservatory could be the
best way forward. Provided a
scheme meets the relevant
criteria (see page 9), then
it can be completed under
permitted development rights
– plus you may not need to go
through the usual building
control rigmarole, either.
Our model conservatory, based on a design by Crystal Direct, will add
20m2 of space to an existing property. The zone will have to be separated
from the main house using external-quality doors and must be heated
independently, too, to avoid Building Regs inspections. For this reason, it
will be more of a garden room than an extension of the current living space.
The Build It Estimating Service prices the work at £23,506 including
labour, plant, materials and VAT – and we should be able to complete
the project in just seven weeks. The biggest outlay will be on the main
conservatory structure, at £8,282 before VAT, and payment for this will
be expected on delivery (around week three or four).

Elements Cost m2 Cost % Total cost

Above: Previously around £1,200 per m2. You can expect Commencement £27 3% £531
rundown, this this to rise to well over £2,500 per m2 Foundations & footings £137 14% £2,741
Victorian house has for a high-end design. Oversite & slabbing £66 7% £1,326
been transformed Brickwork £60 6% £1,194
thanks to a striking The three projects featured here Conservatory £414 42% £8,282
new extension offer a good indication of what you Internal preparation £1 <1% £25
can expect to pay for different types of Structural openings £74 8% £1,478
extension built to fairly standard quality First fix electrics & plumbing £34 4% £685
level. Note that we’ve not included Plastering £120 12% £2,398
figures for elements such as kitchen Second fix joinery, electrics
cabinets, appliances or sanitaryware, & plumbing £33 3% £666
as the prices for these can vary wildly Internal decoration £13 1% £262
according to your specification choices.
Subtotal
To get a detailed estimate for VAT @20% £979 £19,588
your extension project visit
www.self-build.co.uk/estimate Grand total £196 £3,918

Note: Build It Estimating Service figures are based on live costs for materials and labour. £1,175 £23,506
For the purpose of this article we have rounded to the nearest £1.

EXTENSIONS 11

BENCHMARK COSTS: BENCHMARK COSTS:
SINGLE STOREY EXTENSION DOUBLE STOREY EXTENSION

Location Midlands Type of project Single storey flat roof Location Midlands Type of project Double storey extension
extension Floorspace added 20m2 Build cost £28,885 VAT Floorspace added 40m2 Build cost £52,671 VAT £10,534
£5,777 Total cost £34,662 Total cost per m2 £1,733 Total cost £63,205 Total cost per m2 £1,580

Using the Build It Estimating Taking on a double-storey addition
Service, we’ve priced this single- can give you maximum bang for your
storey rear extension at £34,662 buck, adding considerable living space
including labour, plant, materials while minimising the potential impact
and VAT. The project features on garden amenity. From a cost
bifold doors and a roof lantern, perspective, you can think of a two-
and could be the perfect choice storey extension as equivalent to
for creating an open-plan kitchen stacking a couple of boxes on top
diner or a similar zone. of each other. There’s more wall than
We expect the works to take around eight weeks – so slightly with a single storey addition, but the
longer than adding a conservatory, plus we’re anticipating an extra amount of roofing and foundations
cost of just over £11,000. But the result will be more integrated into required will be very similar. Hence
the existing house, with a shared heating system and no need to at £1,580 per m2, this model project offers better value for money
separate the new space with external quality doors. than the flat roof extension – albeit the overall outlay is greater.
A similar design with a pitched roof would come in slightly The Build It Estimating Service gives a cost of £63,205 for our
more expensive, at around £36,388 including VAT. This is largely 40m2, double-storey extension. We’ll be on site for 13 weeks and
down to the extra costs involved in erecting and finishing a gable it will be more difficult to live in the house during the works, so
wall inside and out. In terms of the covering, while a flat roof we may need to pay for rental accommodation.
structure would cost more to build, surfacing it is significantly
cheaper – so the total price comes out around the same. Elements Cost m2 Cost % Total cost

Elements Cost m2 Cost % Total cost Commencement £57 4% £2,288
Foundations & footings £70 5% £2,790
Commencement £27 2% £531 Oversite & slabbing £34 3% £1,375
Foundations & footings £137 9% £2,741 Brickwork shell £372 28% £14,862
Oversite & slabbing £66 5% £1,326 First floor joists £22 2% £897
Brickwork shell £302 21% £6,045 Roof structure £106 8% £4,256
Roof structure £341 24% £6,825 Roof tiling £145 11% £5,798
Roof covering £79 6% £1,589 Internal preparation £2 <1% £100
Internal preparation £1 <1% £25 Structural openings £45 3% £1,797
Structural openings £74 5% £1,478 First fix £116 9% £4,639
First fix £60 4% £1,199 Plastering £155 12% £6,191
Plastering £159 11% £3,172 Second fix £155 12% £6,193
Second fix £175 12% £3,494 Internal decoration £33 3% £1,317
Internal decoration £19 1% £371 External decoration £4 <1% £142
External decoration £4 <1% £89 Completion £1 <1% £26

Subtotal £1,444 £28,885 Subtotal £1,317 £52,671
VAT @20% £289 £5,777 VAT @20% £263 £10,534

Grand total £1,733 £34,662 Grand total £1,580 £63,205

12 EXTENSIONS

OLD MEETS NEW
A selection of innovative glazing solutions, supplied by IDSystems,
ensure that this contemporary addition oozes wow factor

LOCATION Before embarking upon their extension scheme, MOOI ARCHITECTURE/ MATTHEW SMITH
Cambridge homeowners Dom and Marine believed that their
Victorian terraced dwelling in Cambridge was
EXTENSION SIZE awaiting its moment of glory. Situated at the heart
18m2 of the city’s conservation area, the property has since been
transformed via the construction of a striking contemporary
TOTAL GROUND addition, designed by MOOi Architecture.
FLOOR SIZE Dom and Marine's key aim was to create a bright and
68m2 contemporary open-plan kitchen and dining area with a strong
connection to the rear garden. Following five months on site,
CONSTRUCTION the finished project delivers an elegant living space flooded
METHOD with natural light. It complements the existing historic property
Masonry & and provides a distinctive, creative solution to their brief.
timber frame MOOi's design team addressed the couple's aspirations
by incorporating large expanses of glazing, generous ceiling
BUILDING WORK heights and a feature pocket door. A sliding glazed entrance
TOOK by IDSystems was also fitted, plus mahogany flooring
Five months reclaimed from a local school gymnasium.
The homeowners, who come from a design background,
also added a number of eye-catching finishing touches
themselves. A Scrabble-style kitchen splashback and several
garden sculptures are some of the most striking flourishes,
which add personality to the revamped space.

IDSystems’ theEDGE2.0 sliding door system was specified
for the kitchen area because of its narrow 20mm frames and
the ease with which the entrance operates. The versatility
of the setup means it can be used as a single leaf door that
glides smoothly back into its pocket.

In the living area, a three-panel version was chosen for its
ability to break down the boundaries between inside and the
decking beyond. Thanks to the doors’ narrow intermediate
frames, sunshine flows into the extension and original house,
even when the leafs are closed. This means the interiors
benefit from natural brightness all year round.

The glazed entrances are complemented by two large
frameless rooflights that run from front to back on either side
of the extension, creating pockets of light throughout. This
span of sunshine connects the addition to the rooms in the
original house, ensuring everywhere stays bright.

The flank walls are built using masonry construction, with
an internalised exposed Gault brick wall inside introducing
an additional design flourish. The rear infill elevation is of
timber frame construction, allowing flexibility in the integration

of the large sliding glazed panels and pocket door. This EXTENSIONS 13
glazed entrance provides a seamless connection to the
contemporary landscaped terrace, which features stylish TOP TIPS
wraparound seating and a cedar boarded fence.
Edward Stobart, head of projects at
Black render was chosen for the extension’s exterior IDSystems, shares his advice on choosing
finish, providing a striking yet relatively affordable covering. glazing solutions for your extension
Combined with IDSystems’ thin black-framed sliding doors
G Installing a panel sliding door as opposed to a
traditional rear entrance creates design consistency
across the back of an extension such as this. It also
allows the kitchen to seamlessly connect to the decking
and garden area beyond – perfect for establishing a
stylish and contemporary entertaining space.

G Slim framed sliding doors are ideally suited to the
British climate. These designs allow for larger
glass panels, meaning that even when closed during
colder months they enhance the sense of connection
between home and garden.

G Finishing touches are all important. In this instance
the door frames were colour matched precisely to the
render used on the extension, while the stainless steel
handles match the contemporary decor of the interior.

We had a vision of what we wanted IDSYSTEMS
to achieve, and the end result is even
better than we could have imagined For nearly 20 years IDSystems has manufactured,
supplied and installed award-winning glazing solutions
and Anthra Zinc copings, the combination of products forms for extensions, renovations and self build projects
a complementary palette of materials in varying tones of across the length and breadth of the UK. Renowned
black and grey. The extension is topped by a large green roof for their expert advice and innovative products,
system from Sarnafil, which has been planted with camomile. IDSystems’ range includes theEDGE2.0, an
Once established, its flowers will be visible from ground level, ultra-slim sliding door with incredibly narrow 20mm
creating a playful, fun contrast to the black structure below. sightlines; award-winning German-made Sunflex
bifolds and innovative Swiss-designed slide and turn
Dom and Marine are thrilled with the final design. “We had doors; plus windows, glass roofs, front doors, internal
a vision of what we were trying to achieve, and the end result glazing and stylish balustrades. Based in Norwich,
is even better than we could ever have imagined,” says Marine. the company’s dedicated team works closely with
“What we’ve learnt from our extension project is to seek clients, architects and builders to ensure each product
out expert advice throughout. We found two of the best in is custom made to the exact requirements of the project.
IDSystems and MOOi Architecture”.
IDSYSTEMS
Tel: 01603 408804
Web: www.idsystems.co.uk

14 EXTENSIONS

NATURALLY-LIT TOP TIPS
OPEN-PLAN LIVING
from Peter King, architect and
A new extension has created the large family space that this household was in need of, founder of The Rooflight Company
and carefully chosen rooflights make it a bright and inviting space throughout the day
l S eek advice on where to position
LOCATION With open-plan kitchen-dining-living areas the overhead windows in your
Surrey becoming increasingly popular as the focal new roof. Well placed rooflights
point of a property, many homeowners are can maximise light and create
PROJECT TYPE choosing to knock through walls and extend dramatic internal effects.
Extension existing rooms to establish capacious zones that can be used
by all the family. This was certainly the case for this dwelling l The CAD programme SketchUp
EXTENSION SIZE in Surrey, as a single storey rear addition links with the can analyse where light will fall at
33m2 remodelled living room to create a large, light-filled zone any given time of the day, month or
for occupants to spend time together. year. This is a great programme to
TOTAL HOUSE use when planning where the
SIZE Careful consideration is needed to ensure bigger living rooflights will be installed.
278m2 spaces are well-illuminated with sunshine. Adding overhead
glazing to a single-storey extension can provide vast amounts l If you own a listed property or are
PROJECT COST of top light. However, the unit's position on the roof can have building in a conservation area,
£86,000 a dramatic effect on the user experience. For example, don’t be afraid of extending. A
rooflights placed nearer to a side wall will provide ample sensitively designed addition will
BUILDING WORK illumination throughout the day and create an inverted sundial prolong the useful life of a historic
TOOK pattern on walls. This is a beautiful way to create brightness dwelling and can actually reinforce
22 weeks and shade in different areas of the room. and add to its character.

The family decided to employ The Rooflight Company to THE ROOFLIGHT
provide their new overhead glazing. The addition’s roof has COMPANY
been designed to incorporate varying slopes, so the Neo
Plateau Rooflight was chosen, as it can be installed into The Rooflight Company was
pitched structures of up to 10°. The large units have helped founded 25 years ago by architect
to create a bright and airy new kitchen-dining-living space, Peter King. Since then it has gone
where a partition wall helps to zone the different areas. on to develop an extensive range of
high quality rooflights, roof windows
and skylights.These include heritage
and contemporary products, as
well as pitched and flat units, which
means that there’s something to
suit every project. Underpinned
by an ethos of innovation, The
Rooflight Company has established
an outstanding reputation for
design excellence. Employing
approximately 60 people, the firm
is an award-winning organisation
based in West Oxfordshire.

THE ROOFLIGHT COMPANY
Tel: 01993 833108
Web: rooflightcompany.co.uk

WOW-FACTOR TOP TIPS
KITCHEN EXTENSION
from Mark Cosgrove,
Expansive glazing has been used in this new kitchen-living space, creating a light-filled managing director of
room that benefits from natural illumination throughout the day Haus Glass

LOCATION H  omeowner Matthew first visited Haus Glass's G When designing an extension, it’s
Chester showroom in Cheshire during a new product important to be sympathetic to the
launch. Impressed by what he saw there, he later property and its surroundings.
EXTENSION SIZE returned for a one-to-one to discuss his extension There are many glazing products
56m2 project and its glazing requirements with the team. He brought out there – something to suit every
along the architectural drawings for the scheme, which was home, both traditional and modern.
PROJECT TYPE to include a new industrial-style kitchen featuring lots of
Extension contemporary products and finishes. G Contemporary-style additions can
co-exist with a period property –
GLAZED DOORS, Designed specifically to keep in style with the original often working to highlight the
ROOF & FEATURE Victorian masonry house, the new addition features exposed building's character. However, it’s
WINDOWS brickwork, steel and expansive glazing. At the same time, the vital to specify the right door or
Haus Glass contemporary edge that the chosen industrial look offers window design; the wrong choice
complements the period details of the building; this design can make the whole scheme look
trend is particularly popular in urban extensions. and feel very out of place

Matthew opted for Haus Glass’s flat roof glazing; the large G Get the frame colour right. People
span of overhead glass floods the new living space with often play it safe with grey or black,
ample natural light, as well as offering spectacular sky views. but there are hundreds of options.
Clerestory windows positioned high on the walls stretch Ask for samples and take your time
the width of the new walls and meet in one corner, further to decide. Going for something a
maximising how much daylight enters the kitchen-living zone. bit different allows you to put your
stamp on your dream project.
Haus Glass’s grey Ral 7016 bifold doors open the new
extension onto the garden, helping to blur the boundaries HAUS GLASS
between inside and outside living areas. The glazed units
concertina back to expose the full aperture – perfect for Being a small family-run business,
entertaining on long summer evenings. Haus Glass offers a professional yet
personal service for a wide variety of
glazing projects. Starting out eight
years ago as The Bifolding Door
Company, the firm has installed
hundreds of bifolds across the
UK. Since then, Haus Glass has
broadened its product range to include
aluminium windows, glass roofs and
sliding glazed doors – each tailor
made to match your requirements. The
firm covers everything you need; from
the planning stage through to architect
plans and liasing with your builder and
project manager – offering a service
that's friendly and comprehensive.

HAUS GLASS

Tel: 01925 571557

Web: www.hausglass.co.uk

16 EXTENSIONS TOP TIPS

TWO-STOREY from Opinder Liddar,
TRANSFORMATION director of Lapd
Architects
Matt and Julie Barnes worked closely with the design team at Lapd Architects
to get round planning constraints and build the extension of their dreams G Engage an architect you trust and who
takes the time to understand you.
Before tackling their extension scheme, the owners Great communication and design are
of this semi-detached house – Matt and Julie Barnes the basis of any successful project that
– found themselves with a common problem. They works around the way you want to live.
lived in a property set in wonderful surroundings,
but wanted to incorporate an open-plan family lifestyle and G Take your first steps on the journey
improve the kerb appeal of the building. sooner rather than later. Gaining
planning approval and tendering
LOCATION Gaining planning approval for their two-storey extension, your scheme to contractors often
Oxfordshire with a basement and garage link, wasn’t easy. The couple had takes longer than you think.
previously tried to develop plans with another designer, but the
EXTENSION proposed scheme did not fit with their lifestyle or project goals. G Consider working with a firm – such
SIZE 158m2 as Lapd Architects – that will guide
Soon after, Lapd Architects stepped into the picture. They you through the entire project. Your
TOTAL HOUSE were able to accommodate the multiple factors at play: the chosen practice should keep you
SIZE 323m2 family’s unique requirements, the build budget and the strict informed along every step of the
planning guidelines in the area. After taking the time to listen to way. Cost control, as well as great
CONSTRUCTION Matt and Julie’s ideas, plus an extended correspondence with design, should go hand in hand.
METHOD the planning officers, a new application was approved.
Brick & block LAPD ARCHITECTS
The updated design incorporates the double-height space
TOTAL PROJECT that Matt and Julie wanted. Modern aluminium bifold doors This professional practice believes
COST provide a multi-functional, well-illuminated kitchen-diner and communication is at the heart of every
£300,000 living room. The spacious first floor ensuite bedrooms boast successful project. The firm works
vaulted ceilings and command a view of the surrounding with a range of clients, from those
HOW LONG landscape through large windows. The glazed gable at the who want extensions and interior
BUILDING WORK rear of the property is a feature in its own right, complemented alterations to those who require
TOOK by the contemporary render and brick detailing. high-end refurbishments and listed
One year building renovations. Lapd listens
Thanks to the Lapd team, a project that was almost resigned to you to gain an understanding of
to the failed ideas pile was totally turned around. This project what you want before guiding you
demonstrates the importance of working with the right firm through the whole process. From
in order to navigate the practical constraints of a scheme, initial design, through planning and
delivering your dream home on time and on budget. tendering, up to project management
and completion, the team works to
filter the noise and keep you in control
of the decisions that matter.

LAPD ARCHITECTS
Tel: 01865 407722
Web: www.lapdarchitects.co.uk

CHARACTERFUL TOP TIPS
ADDITION
from Charlie Mills,
Designed by GreenRooms by Oakwrights, this striking oak extension provides the manager of
perfect complement to Rachel and James Good's traditional home in Buckinghamshire GreenRooms
by Oakwrights
LOCATION K  een to embrace a quiet life in a rural area, Rachel
Buckinghamshire and James Good moved to Buckinghamshire in G To make an extension work, it's
2009. Some time later, the couple decided to extend vital to identify the drawbacks
EXTENSION SIZE their home to create extra living space. The Goods of the current arrangement and the
91m2 wanted to open up a large area for entertaining in the dining opportunities for the new zone. Is
and lounge zone. They were also keen to make the most the kitchen too small, for instance?
TOTAL HOUSE of family living by establishing a new kitchen. For Rachel, a Do you need a dining space or
SIZE new culinary zone was the top priority. “When we attained an additional lounge area?
390m2 planning consent, the first thing I did was to put a deposit
on a new Cotteswood suite,” she says. G Your intended use of the new room
METHOD OF should drive the design – whether
CONSTRUCTION Thanks to its aesthetic beauty and character, green oak you want bifolds leading to an
Green oak frame frame was selected as the structural system for the addition. outside eating area, or a sunny
The couple worked closely with a design consultant from spot to read and take in views.
PROJECT COST Oakwrights to develop the plans for their pitched roof garden
£180,000 room, which would accommodate the new kitchen. “In G When you open up and make
architectural terms, we wanted the original farmhouse to be a new space, using oak adds
BUILDING WORK positioned alongside a subservient extension,” Rachel says. wow factor, creating a tactile
TOOK After submitting their planning application to the local council, and visual presence. It also gives
Five months the scheme was approved and construction could begin. the property a unique selling point
for the future and adds value.
Keeping the stunning countryside views in mind, Rachel
and James opted to install large sliding windows to preserve GREENROOMS BY
the bright, open feel of the space. The addition has been clad OAKWRIGHTS
in oak, which helps it feel warm and welcoming.
With a deep knowledge of oak framing,
“The kitchen is a real focal point of the addition and the incorporating traditional and modern
oak frame gives it the most amazing character. It’s perfect techniques alongside a range of
for entertaining,” says Rachel. “I’m so pleased with the result architectural influences, GreenRooms
of the project – the design works very well.” by Oakwrights understands this type
of construction. The firm appreciates
how this build system has evolved
over the years and how it fits into 21st
century living. Its heritage is backed
by years of experience developing oak
frame homes, outbuildings and other
external structures. GreenRooms’
multi-award-winning parent company,
Oakwrights, designs and constructs
all styles of oak frame houses.

GREENROOMS BY
OAKWRIGHTS
Tel: 01432 353353
Web: greenroomsbyoakwrights.co.uk

18 EXTENSIONS

EYE-CATCHING OPEN-
PLAN EXTENSION
David and Sarah Thomas developed this striking new addition, bringing a modern edge to their traditional Edwardian property

LOCATION When they tackled their Glazed entrances were a key element
London extension scheme, David of the design from the start of the project.
and Sarah Thomas’ key Kloeber worked alongside the couple
EXTENSION SIZE goal was to improve and the architect to ensure the perfect
30m2 the layout of the existing dwelling to products were chosen to match the
establish an open-plan layout. The brief. While David and Sarah considered
TOTAL HOUSE two-bedroom ground floor flat forms several companies, Kloeber was able
SIZE part of a converted Edwardian house in to supply the handles, finish and high
111m2 north London. The couple’s short term performance the couple wanted, with
plan was to rent the property out, with a a simple and modern aesthetic.
METHOD OF view to creating a suitable forever home
CONSTRUCTION for when the time came to downsize. Two sets of aluminium Kloeber
Concrete beam KustomSlide Plus doors, measuring
and block floor, with The flat had an awkward layout almost 2.6m high, were installed in the
blockwork walls and with an existing lean-to rear addition, kitchen-diner. These form a stunning
an EPDM roof which comprised a small kitchen with feature, creating a sense of space and
separate dining and living rooms, and a seamless connection to the outdoors.
TOTAL PROJECT no easy access to the garden. One of A set of aluminium KustomFold doors, at 2.7m high, lead
COST the Thomases' priorities was to create directly from the living room to the decked terrace, which
A similar project a series of everyday living spaces that also links to the contemporary dining area.
would cost around would benefit from a strong connection Planning permission was required for the design, and
£150,000 (plus VAT) to the outdoors. discussions with the local authority led the Thomases to
They wanted the specify a crisp white external render for the extension walls.
HOW LONG space to be bright,
BUILDING WORK well-insulated and
TOOK energy-efficient.
12 months The result is an
open-plan living
area featuring
a contemporary
kitchen-diner. This
sleek zone leads
onto a raised,
decked terrace
with steps down
to the garden.

David and Sarah
worked closely
with the design team at Charlick + Nicholson Architects to
develop a project brief. As the couple already had a strong
idea of what they wanted to achieve, they were able to put
many of their own ideas forward and get involved with various
areas of the scheme. This included a visit to the Kloeber
showroom, where they selected their sliding and bifold doors.

Before they could proceed with the build, the planners also EXTENSIONS 19
required evidence of the age of the existing rear addition,
using historic plans and photographs to prove it was part of TOP TIPS
the original house. This meant that the architect could justify
a larger footprint for the new extension. Matt Higgs, director and co-owner
of Kloeber, shares his expert guidance on
In order to get Building Regulations approval for the specifying glazed doors for your extension
project's expansive areas of glazing, the insulation values
in the original part of the flat had to be improved – so the G To create a light and airy space, think about height
in addition to the footprint of your extension. Tall ceilings
e clever use of space and the and lots of glass always work well to establish a larger
contemporary design is well-suited to our zone that is bathed in sunshine. Plus, you can try to
aluminium products achieve the inside-outside feel by fitting the same flush
flooring on both sides of the threshold, connecting two
brick walls and timber floors were insulated. These upgrades separate spaces to be used as one.
mean the Thomases have also been able to establish a
comfortable property with low running costs. G Consider sliding doors for larger apertures, as these
designs have greater expanses of glass with less
“This was an ideal project for us,” says Matt Higgs, director frame. For smaller apertures measuring under 4m,
and co-owner of Kloeber. “The clever use of space and bifold products are great for opening up the whole
the contemporary design is extremely well-suited to our space and physically connecting with the outside.
aluminium products. Our KustomFold and KustomSlide Plus
doors bring in natural light and open the property out to the G Always plan for the future; what’s right for your current
additional living space, the raised terrace.” situation may not suit you in a few years’ time. Take
the time to ask yourself whether your choices on
materials, products and the way you use the space
will still be relevant in three to five years, for instance.

KLOEBER

For over a decade, Kloeber has offered homeowners
and self builders a range of bespoke glazing solutions,
helping them select the perfect doors and windows
for their projects. The award-winning firm supplies a
vast selection of high-end products, including bifold,
sliding, French and front doors. The company also offers
windows, rooflights and fixed glazed elements.

Kloeber specialises in providing their clients the
full package, from the initial meeting and showroom
visit through to liaising with architects and builders.
The company can also offer a site survey to guarantee
a high quality and efficient installation service, carried
out by its in-house fitting teams.

KLOEBER

Tel: 01487 740044

Web: www.kloeber.co.uk

20 EXTENSIONS TOP TIPS

LIGHT-FILLED from Josh Parkin,
KITCHEN-DINER general manager at
Alpine Aluminium
anks to the specification of glazed products in their new extension, Stefan
and Maggie Shaw have transformed their home into a light-filled gem G Think about how you'll use the
space. If you spend more time with
LOCATION U  nable to benefit from the sunny orientation of their the doors closed, sliding versions
West Yorkshire south-facing home, Stefan and Maggie Shaw were have slimmer frames and a less
keen to revamp the property by adding a single-storey interrupted view. Bifolds produce
EXTENSION SIZE extension. They worked with Alpine Aluminium to a wider aperture when fully open.
53m2 transform the dwelling from its original dark, multi-room layout
to establish a beautiful open-plan living space. G Select glass that suits your needs.
METHOD OF The Shaws were keen to fit the right combination of glazed The correct type can keep you
CONSTRUCTION features, and the new addition comprises an array of slimline cool in the summer, retain heat in
Brick & block aluminium products. Each of these elements was chosen for winter and even self clean.
its ability to maximise light, provide a contemporary finish and
TOTAL PROJECT improve the overall functionality of the living space. Maintaining G When specifying the configuration
COST a high level of security was also a top priority. of your bifolds, choosing an odd
£70,000 Given that the doors would remain closed the majority of the number of panels allows you to
time, Stefan and Maggie specified Alpine Aluminium’s AP45 have a single leaf that can be used
BUILDING WORK Slimline Sliding doors with thermal glazing. Combined with a when you want to pop in and out.
TOOK roof lantern, this allows the expansive glass features to create
Six months an open-plan room, bathed in natural light. The energy-efficient ALPINE ALUMINIUM
products keep bills to a minimum – retaining heat in the winter
months and keeping the living space cool during summer. With over 35 years of experience
The new extension provides the perfect modern floorplan in the glazing industry, Alpine
for the Shaws, ideal for entertaining guests and enjoying the Aluminium is recognised as one
garden. The sliders can be drawn back to open the home to of the UK's leading specialist
the outdoors, or create a private area inside by closing them. manufacturers of high quality
“We are delighted with the results!” says Stefan. “We spoke aluminium products. Customer
to a number of manufacturers before choosing Alpine. We service is at the heart of everything
couldn't fault the service and finish. Whilst the quality of the the company does. It provides
doors is exceptionally high, the quote was actually less than premium bifold, sliding and front
many we received. We would highly recommend!” doors, in addition to roof systems.
The firm’s range of products is
manufactured in the UK, with
premium grade aluminium used
at all times. It is known for
product innovation, technical
competence and high quality.
Alpine Aluminium’s service-led
approach has resulted in steady
growth over the past 15 years.

ALPINE ALUMINIUM
Tel: 0113 350 6588
Web: www.alpinealuminium.co.uk

ROOF WINDOWS EXTENSIONS 21
CREATE BRIGHT & AIRY
KITCHEN EXTENSION TOP TIPS

Curved rooflights from VELUX bring natural brightness right into the heart From Grant
of this stunning kitchen-diner – creating the perfect space for entertaining Sneddon, product
manager at VELUX
LOCATION Georgina and Mark Welsh bought their semi-detached
Leeds home in Leeds mainly because of the garden – an G Roof windows can let in twice as
important feature for a couple who enjoy spending much daylight as vertical glazing
PROJECT TYPE time outside with friends. But the property’s east- of the same size – and this can
Single-storey kitchen facing orientation made it too dim, and they were already looking help to make your new extension
and dining room at ways to make it brighter before they had even moved in. feel even more spacious.
extension
“When we viewed the house, we knew that the kitchen and G Always aim to realise your room’s
ROOF WINDOWS dining room were quite dark, but we loved the location and the full daylight potential – the more
VELUX curved glass garden, so went ahead with the purchase,” explains Georgina. roof windows you install (and the
“Over time, the lack of natural daylight began to dissuade us larger they are) the more natural
from using the dining room, and we missed the bright summer brightness you will enjoy in your
evenings we’d enjoyed so much in our previous property.” home's new extension.

The couple planned to add more usable living space and G If you’re building a flat roof
create a bright, airy kitchen-diner by installing VELUX curved extension, then you should
glass roof windows. The units feature CurveTech, an innovative prioritise daylight and fresh air
surface that allows rainwater to easily drain off the surface to as key elements of your design.
minimise maintenance. A programmable control pad allows If you choose the automatic
remote operation of out-of-reach windows. A pre-fitted sensor VELUX INTEGRA overhead
can shut the rooflight automatically in the event of rain. windows, then you can have all
of that at the touch of a button.
“We knew the overhead glazing would bring much-needed
light and fresh air into our home,” says Georgina. “My son and VELUX
I can sit at the piano for hours or in the corner under the roof
window and just gaze out. We don’t need to turn the electric For more than 75 years, the VELUX
lights on at all for most of the day. The difference they have Group has created better living
made to our environment has totally surpassed our expectations.” environments for people around the
world; making the most of daylight
and fresh air through the roof. The
company’s product offering includes
roof windows and modular skylights,
decorative blinds, sun screening
options and roller shutters, as well
as installation and smart home
solutions. These products help to
ensure a healthy and sustainable
indoor climate, where people
work, learn, live or play.

VELUX
Tel: 01592 778225
Web: www.velux.com

22 EXTENSIONS

A SHINING EXAMPLE TOP TIPS

Anne and Peter Hughes’ mirror-clad home is a light and spacious escape from city life Homeowners Anne and Peter
Hughes share their learning points
LOCATION Anne and Peter Hughes desperately wanted more for taking on a major project
South East London space for themselves and their young son, but
finding a dwelling in their price range was a struggle. l B uilding next to a listed property
TOTAL HOUSE They had almost given up hope when Anne stumbled proved to add complications when
SIZE across a property that ticked all of their boxes. Located in a it came to the planning process.
200m2 scenic South East London estate, the dated 1950s bungalow We faced a lot of backlash and
had plenty of promise but would require work, including a rear heard that some other residents
METHOD OF extension. “It was the worst house on the best street, but we around the corner from us had
CONSTRUCTION didn’t mind as we knew we could make it our own”, says Anne. exactly the same problems.
Brick & block
Securing planning permission in this protected conservation l Choose a designer who knows
TOTAL PROJECT area was a fraught process due to unsupportive neighbours, the local area and planning
COST but Anne and Peter’s persistence won them over. As the department well. Talk to people
£283,400 build began, however, it became clear that the architect’s who have worked with them
measurements were incorrect. Forced to make compromises, before and ask to look at previous
BUILDING WORK the couple were left disappointed by the finished result. jobs. The first time we saw Red
TOOK Squirrel’s work we felt we were
17 months Four years later, they decided to try again, this time on the same wavelength as them.
employing architectural firm Red Squirrel. The aim was to
create a light and spacious addition to remedy the previous l We absolutely love our poured
claustrophobic extension. Architect Miles Griffies designed a concrete floor, but having this
contemporary open-plan scheme, fitted with expansive glazing, surface on top of underfloor
to house the kitchen, diner and lounge. Outside, the Hughes’ heating wasn’t ideal, because the
settled on unusual mirror cladding. “I wanted something way it’s put together means lots of
reflective to add extra light,” Anne explains. layers need to be applied. We did
the curing process meticulously,
While they had their fair share of trials along the way, the but the floor still cracked a year
couple are very proud of the new space they’ve created. later. The result looks beautiful, but
“Although the journey was difficult at times, when the project we regret not doing more research
was finally finished the end result was so much better than on how to prevent it from cracking.
what I’d pictured in my imagination,” says Anne.
Closer look

Large panels of overhead glazing
were incorporated into the ceiling
of the extension, allowing daylight
to pour into the new open-plan
living zone. Small glimpses of
the natural world balance out
the kitchen’s industrial aesthetic.

EXTENSIONS 23

EXTENSION SPECIFIER

KEY With the right design and specifications, extending New life has been given to a tired seaside house
PRODUCTS your home can transform it into a spacious, light- thanks to a luxurious, open-plan extension
filled dwelling. It can add real value, too, but as
INSURANCE with any major structural work, careful thought is
needed when choosing materials. These will affect
MATERIALS how comfortable the finished space will be, both in
terms of looks and thermal efficiency. Before you
ROOFLIGHTS begin, make sure you have adequate site insurance
in place – few standard buildings insurance policies
GLAZED DOORS will cover this kind of work. When picking products
and services, consider your overall goals and project
budget – maximising daylight and creating a strong ALISTAIR NICHOLLS
connection with the outdoors are a key priority for
many homeowners, for instance. Here are some key
products to consider for your project.

Luxury glazed entrances The hook and shoot bolt locking mechanisms mean you can
be confident that your doors are secure. Glass providing a
For many homeowners, establishing a continuous connection U-value of 1.0 W/m2K is supplied as standard, but this element
between inside and out is a top priority. In lots of cases, bifold can be tailored to suit the scheme’s unique requirements.
doors provide an ideal solution. Folding Doors 2 U offers an
array of entrance designs, in various materials, to suit your project. FD2U offers a selection of glazed products at affordable prices,
Hardwood composite versions clad with aluminium are available, with other items including sliding doors and roof lanterns available.
in addition to those with aluminium or timber frames. It’s also You can choose between supply-only or a full installation service.
possible to tailor the look of your system by selecting from a
diverse range of RAL colours and stain finishes. FOLDING DOORS 2 U
Tel: 01621 834123 Web: www.foldingdoors2u.co.uk
In order to emphasise the seamless connection between the
garden and interior space, many people choose the company’s
slim 60mm sash profiles, which successfully maximise the outlook.

24 EXTENSIONS

Integrated window blinds HV 350 windows have the advantage of being able to be
equipped with Internorm’s I-tec shading. These work by including
Whether to frame views, draw maximum amounts of natural light a photovoltaic panel that harnesses energy from the sun –
inside, use the sun to boost indoor temperatures or simply offer a especially useful if there is no direct electricity supply available.
better connection with the outdoors, more and more homeowners This method contributes to better energy efficiency in the home
are looking to install wide spans of glass when extending a house. through the use of renewable tech. I-tec can even be controlled
Ensuring you have the right shading precautions in place is an conveniently on your smartphone via app. Alternatively, the motor
essential for thermal efficiency and to maintain privacy. blind can be battery operated. I-tec ventilation can also be fitted;
having this included in the window frame means ventilation can
One convenient option is to buy windows with blinds fitted be controlled for each room individually and as required.
between the panes – a subtle result that means you’re paying one
price for both glazing and shading. Their position sheltered within With Internorm integral blinds, you can open the window to
the unit also means they are a virtually maintenance-free option, allow access as one of the panes is on a hinge – perfect for
as you don’t need to worry about dust or moisture gathering cleaning the units; just a micro fibre cloth used without cleaner
between the slats. They can also help with sound protection – provides a flawless finish. Another advantage is that you need
something that’s especially important near busy roads. not worry if something goes wrong with the blinds, as it’s easy
to look inside to adjust the unit or have it replaced if necessary.
Internorm’s HV 350 windows with integrated blinds combine
sun protection and privacy in one unit. Available in PVCu or INTERNORM
a timber/aluminium design, you can choose from venetian or Web: www.internorm.com
opaque Duette blinds. Venetian-style units mean you simply
adjust the angle of the slats to regulate the amount of light coming
inside. Different colours are available to suit your decor; you can
also opt for blackout versions with an aluminium coating.

EXTENSIONS 25

Characterful oak frame extensions

A spacious, open-plan layout is often found high on the project
wish lists of many homeowners. However, in some cases a lack
of space, structural wall issues and rolled steel joists can get in
the way of the spacious floorplan people envision. To avoid this
kind of headache, an alternative solution is to extend outwards
into the garden by creating an eye-catching oak frame addition.

Not only do these structures exude characterful appeal from
the outside, but they have just as much visual allure when you
step inside, too. Exposed oak beams infuse the space with a
homely feel, while the use of glass and plaster helps to blend
traditional with contemporary, resulting in a striking aesthetic
that will attract admiration for years to come. Another prized
element that oak framing offers is high vaulted ceilings, which
are beautifully accentuated by curved oak trusses and beams.

Based in East Sussex, The Oak Designs Co. offer their services
on a nationwide basis. The firm has an extensive product range
and is renowned for its excellent quality.

THE OAK DESIGNS CO.
Tel: 01273 400411 Web: www.oak-designs.co.uk

Rooflights and custom made glass roofs by IDSystems

When completing an extension, some of the key decisions revolve
around how to fill the new addition with natural light. It’s important
to channel plenty of sunshine into the existing house, too.

IDSystems’ range of glass roofs offers an ideal solution,
whatever your requirements and the design of your extension.
From stylish, frameless flat rooflights and lanterns, to glazed infills
within tiled and pitched slate roofs, the company offers a range
of innovative solutions. It also provides complete structural glass
systems that are custom made to meet your unique requirements
in terms of shape, size and configuration.

IDSystems has been an industry leader for nearly 20 years, and
their range of glass roofs offers an innovative design solution to suit
an array of projects. Thanks to the use of unique integrated ring beam
technology, their structural glass roofs are capable of achieving an
uninterrupted glazed span of up to 6m. These systems can also be
incorporated alongside the company’s range of bifold, sliding and
glazed door setups to provide a seamless finish to your extension.

IDSYSTEMS
Tel: 01603 408804 Web: www.idsystems.co.uk/roofs

26 EXTENSIONS

Add a sense of light and space

If you want to maximise floor area and create a feeling of With a focus on quality, security, insulation and aesthetics,
connection between inside and out, bifold doors could be the Kloeber specialise in offering a full, tailored package with on-site
ideal glazing solution for your extension. Allowing you to open up surveys and installation services incorporated. The company’s
a wall of your home, around 90% of the aperture, they’re well- experienced sales advisors will be able to help you choose the
suited for entertaining and perfect for smaller openings. perfect bifold doors to suit your project and lifestyle.

Bifold door units can open inwards or outwards, the latter KLOEBER
option allowing you to take full advantage of space inside without Tel: 01487 740044 Web: www.kloeber.co.uk
the concern of furniture getting in the way. A level threshold with
similar flooring on both sides will help to establish a cohesive
living area with a seamless connection to the outdoors.

Kloeber’s bespoke bifold doors are made to order, using
high quality profiles and ironmongery with a choice of double
or triple glazing. They are PAS 24 tested and therefore compliant
with Part Q of the Building Regulations. Thanks to low U-values,
they are also a thermally-efficient option.

Available in thermally broken aluminium or solid engineered
softwood, hardwood or oak, you can choose from a variety of
opening configurations, cill details and paint or stain finishes.
There’s also a dual colour option where you can choose from over
200 RAL colours for the inside and outside frames, which is ideal
if you want to coordinate with your interior colour scheme.

EXTENSIONS 27

Insure your extension project and which will insure completed works against faults in design,
yourself against unforeseen losses workmanship or materials if they become defective in the future.
This is often a requirement of lenders or a prospective purchaser.
Most people don’t realise that home insurance is unlikely to
provide sufficient cover if you’re extending or altering a property. Protek’s team of experienced staff will be happy to guide you
Invariably, your contractor’s insurance won’t adequately protect through the risks you face and give you the protection you need.
you either. That’s why it’s so important to get specialist cover
for your scheme. By purchasing Protek’s extension insurance, PROTEK
you can be sure that the scheme and your home will be suitably Tel: 0333 456 8030 Web: www.protekselfbuild.co.uk
protected through the duration of the build programme. Packages
are available for a wide range of projects, including loft and
garage conversions, side extensions and basement additions,
irrespective of who is carrying out the works.

The product is specifically designed to include building works,
plant tools, materials and equipment and any consequential
loss or damage to the existing dwelling. For example; if there
is a collapse whilst the structure is temporarily being propped
to create a new opening, the unforeseen rebuilding jobs will
be covered. The insurance is available for short periods of time
and includes protection for public and Employers’ Liability.

If you need a Party Wall Agreement with a neighbouring
property, then you will be assuming liability for rectifying any
damage you cause, which can become quite serious. Protek
can include the optional cover required to adequately protect you
in these situations. A 10 year structural warranty is also available,

28 EXTENSIONS

Connect inside and out with ALPINE ALUMINIUM
glazed bifold doors Tel: 0113 350 6588 Web: www.alpinealuminium.co.uk

Ideal for creating a seamless connection between interior spaces
and the garden, Alpine Aluminium’s AP70 Slimline Bifolding Doors
provide a versatile solution that gives the homeowner maximum
control over the style and operation of the glazed entrance. Bifolds
are an ideal product if you’re keen to create an unbroken link
between inside and out, as the panels can be drawn back and
stacked compactly together to reveal a broad opening.

Manufactured using high quality materials and hand-finished
at Alpine Aluminium’s specialist factory in Leeds, the system
combines high security locking mechanisms with robust ultra-
smooth stainless steel roller designs. The lightweight nature
of the framing material means that the AP70 combines a sleek,
slimline aesthetic with reassuring hardiness. The product also
provides the security and reliability you’d expect from a premium
door setup. Plus, you can choose from a broad selection of
finishing options to suit your scheme.

Slim aluminium frames maximise the outlook, and the expansive
area of glazing massively increases natural light levels in your
extension. Open or closed, this type of entrance will make a
room both look and feel larger. Various panel configurations are
available, with leafs that stack either to the left or right of the
aperture. Little upkeep is required for the AP70 setup, thanks
to the low-maintenance qualities of aluminium. This product is
available on a fully-fitted or supply only basis.

EXTENSIONS 29

Glazing with heritage appeal This glazing range features an industrial metal-framed appearance,
but is made from slim aluminium with finish options including
If your extension is in the traditional style of the original property, different textures or RAL colour powder coatings. Although
then using similar building materials is key to achieving the desired inspired by traditional dwellings, the versatile units also look
period look. Haus Glass have worked alongside architects, interior stylish when applied to contemporary-looking buildings.
designers and homeowners needing something in-keeping with
the style and age of a house, which is why they have produced HAUS GLASS
a range of glazing that meets these requirements. The Haus Tel: 01925 571557 Web: www.hausglass.co.uk
Heritage door and window system works on many different period
properties, from Victorian and Art Deco through to 1950s homes.

Realise your dream property with
the Build It 3D Home Designer

Whether you’d like to try your hand at drawing your own plans or
bring an existing scheme to life, the Build It 3D Home Designer
offers a cost-effective way to engage with your project. The
intuitive, easy-to-use software allows you to quickly create
accurate floorplans, elevations and cross-sections that can be
viewed and exported in 2D and fully interactive 3D.

The program is suitable for homeowners looking to extend,
self build or renovate. It allows you to control even the smallest
of details including glazing styles, wall textures and lighting
conditions. Whether you’re planning to go it alone or simply

want to be able to better communicate
your project vision to your architect or
contractor, this powerful software can
help you streamline the design process
and save money along the way to
realising your dream home.

BUILD IT 3D HOME DESIGNER
Web: www.self-build.co.uk/3dsoftware

30 EXTENSIONS

I-tec SmartWindow technology as watching movies, entertaining friends etc. You can even set
from Internorm gives you full up holiday modes so the house looks lived in while you’re away.
control of your living environment
Whether you’re taking on an extension, renovation or new
If you want to make the rooms in your new extension a more home building project, Internorm’s I-tec SmartWindow technology
comfortable place to be, then Internorm’s I-tec SmartWindow gives you the ability to make quick, convenient adjustments to
could be the perfect solution. This intelligent building control the climate and atmosphere in your living spaces.
technology enables you to easily and conveniently operate
your fenestration’s ventilation and shading via your smartphone, INTERNORM
tablet or PC – whether you’re at home or away. Web: www.internorm.com

Convenience is at the heart of Internorm’s I-tec SmartWindow
design. The easy-to-install system can be hooked up via your
router to provide you with instant control of a range of features –
from I-tec ventilation (giving you fresh air with minimal heat loss)
and integral blinds through to fan light openings. So you can
roll shades up or down at the swipe of a screen and adjust the
internal climate to suit your requirements, for instance. The setup
can be fitted with weather, temperature and humidity sensors
to provide an intelligent ventilation solution, too.

What’s more, the technology can be extended to other home
automation elements, such as dimmer lighting, allowing you to
fully adjust the living environment according to how you want to
use a given room. Every element is controllable individually, but
you can also pre-program various modes to suit activities such

EXTENSIONS 31

Innovative, award-winning sliding doors by IDSystems

The ability to transform homes by maximising the amount of glass GRAND DESIGN. LONDON
– without compromising on security, performance and weather
tightness – is at the heart of IDSystems’ sliding door range. Products are available with a choice of handle options and
with frames in more than 200 RAL colours. Each setup is made
The company’s versatile and technically-advanced selection to the homeowner’s bespoke requirements, providing the perfect
of products extends from single panel options that glide into complement to the unique features of each extension scheme.
pockets, to setups measuring 24m wide. Narrow sightlines
of 20mm are designed so that homeowners can effortlessly IDSYSTEMS
move large glass leafs up to 3m wide. Tel: 01603 408804 Web: www.idsystems.co.uk/slidingdoors

Thanks to its attention to detail, smooth operation and
advanced technology, IDSystems’ ultra-slim sliding setup,
theEDGE2.0, won the Best Glazed Door category at the 2016
Build It Awards. The large panes of glass and minimal sightlines
are ideal for an array of projects, whether you’re trying to make the
most of a stunning rural view or are situated in a tight urban spot,
looking to maximise the amount of light that enters your home.

Alternatively, The Grand Slider offers a highly engineered,
heavy duty system with 83mm sightlines. The setup provides
an industry-leading combination of weather performance and
thermal efficiency, at the same time as maximising the glazed
area and seamlessly connecting home and garden.

Both of IDSystems’ aluminium sliders carries the BSI Kitemark
for quality, plus the prestigious Secured by Design certification
that highlights the doors’ advanced security protection.

LOFT
PROJECTS

IF YOUR PROPERTY IS BECOMING A TIGHT SQUEEZE,
PUTTING REDUNDANT ROOF SPACE TO USE COULD
BE THE PERFECT ROUTE TO IMPROVING YOUR HOME.
HERE ARE THE KEY CONSIDERATIONS TO BEAR IN
MIND WHEN CONVERTING AN ATTIC AREA

The new ACTIVE smart roof window from VELUX
can help create a more controlled, healthier living

environment. Find out more on page 41

LOFTS 33

LOFT CONVERSION BASICS LOFT CONVERSIONS: POPULAR PROJECTS

Asuccessful loft conversion can add around 30% Dormer Rooflight
more floorspace to a typical two-storey home,
and with the right design you can net an increase A popular and affordable option. Usually the most cost-effective and
in market value of 20% or more. So it’s perhaps Dormers are built up out of the roof straightforward route to creating
no surprise this type of project is getting more popular with plane to accommodate conventional habitable loft space, especially where
homeowners: recent research by insurer Hiscox (www.hiscox. windows. In doing so, they add more there’s a clear attic void and sufficient
co.uk) shows a 114% increase in the number of planning head height – increasing the usability headroom. Changes to the roof
consents awarded for loft conversions over the last five years. of the loft space and potentially structure are relatively minor, and
creating a great landing spot for a all the other works are internal, so
Attic extensions tend to be quick, affordable and less staircase. Modest rear dormers don’t planning permission isn’t normally
disruptive than many alternative routes to gaining space – usually need planning permission. required for this type of project.
but there are some considerations to bear in mind before you

press ahead. Is there enough head height, for instance, and if Mansard Hip-to-gable
not can this be easily remedied by adding dormers, or will you
need to invest more in a mansard or hip-to-gable? How can This route involves building out from With this type of conversion, your
you ensure the new zone works effectively with the rest of the existing roof slope, at an angle of property’s sloping side roof is rebuilt
the property? Do you really need a habitable space, or would around 70°, to create a sizeable living to form an upright gable end, thus
a storage zone be a more practical project for your family? space with plenty of floor to ceiling adding more space to your loft. If the
height. The structure can span the existing roof plane and ridge height
Read on for our beginner’s guide to lofts and find the ideas entire width of the building. Dormer is maintained, and the extension isn’t
and advice you need to make a success of your scheme. windows are inserted to gain natural too large, the project may not require
light. A mansard is likely to exceed formal planning consent. A hip-to-
Is a loft co nvers ion rig ht for me? the volume limits for permitted gable is often combined with the
development, so you’ll almost insertion of large rear dormers to
Here are five key signs that extending into your home’s certainly need planning consent. maximise the new living area.
roof could be the best option to add space and value:
1 There’s a large existing roof void with lots of room to Above left & dormer image: This project by Threefold Architects involved replacing two small
dormers with three larger versions to boost brightness and gain more space. Rooflight image:
stand up in, so conversion would be straightforward. Overhead windows can usually be fitted without planning permission. Mansard image: An
2 Stamp duty, moving fees etc mean it would cost L-shaped design by Absolute Lofts. Hip-to-gable image: This project by Econoloft combines
a new gable wall with a rear dormer extension to add a capacious new living area
more to up sticks than to extend into the loft.
3 There’s insufficient space to build into the garden;

or planning restrictions would make this difficult.
4 L iving space is unbalanced across the standard

storeys, or you own a bungalow with a generous attic.
5 You’re keen to create a room that stands alone and

benefits from plenty of natural daylight.

34 LOFTS

DESIGN & PLANNING

important to note that this approach will trusses. Cheap to produce, these use a
always require full planning consent. W-shaped web of bracing to reduce the
size of the main timbers. Reconfiguring
The alternative is to lower the floor level them to provide living space requires the
in the loft by sacrificing some height on input of a structural engineer. This will add
the storey below. This is disruptive work, time and cost, but thousands of people
as your team will be crafting a completely tackle this kind of project every year, so
new ceiling, but it’s usually cheaper than don’t be put off. Modern solutions such
building up and may be achievable under as TeleBeam (page 40) can help enable
permitted development rights. conversion of difficult roofs.

MATT CLAYTON Will there be sufficient What’s the structure like?
usable floor space? You might be put off tackling a loft project
Above: To gain Before you sink any cash into your attic, The pitch of the roof – and how it relates if you spot rotting timbers, defective roof
enough headroom you need to ensure you’re taking on a to the span from wall to wall at floor joist tiles or undersized joists in your attic. In
for this rooflight viable project and come up with a suitable level – will have a big impact on how much fact, these are common issues that a
conversion project, design. Here’s what to consider: area you can add. Generally, the steeper good builder or conversion specialist will
designers Scenario the pitch, the more likely you’ve got a real be used to dealing with. Nevertheless, you
Architecture Is there enough head height? project on your hands. For instance, at an should still get them properly investigated
lowered the loft You can check this yourself by measuring angle of 45°, a zone with a span of 6.5m in order to factor any extra costs into your
floor – creating a the distance between the top of the attic’s is readily convertible using rooflights or budget before you start on site.
spacious but cosy floor joists and the underside of the ridge small dormers. But at 35° or 40°, you
area for relaxation beam. If there’s at least 2.3m of space might struggle to create a worthwhile What will you use the loft for?
available, you should be able to create room unless you opt for a more involved Adding a new ensuite bedroom is one of
a comfortable finished room once the project, such as a mansard extension. the most popular loft projects; and often
new floor and ceiling finishes have been a good choice for increasing value. With
installed. You can get away with 2.1m, Is the roof cut or truss? this kind of project, you’ll need to ensure
but it won’t feel like a full storey. In the past, most roof structures were built there’s enough headroom for a decent
(cut) on site using thick timbers, which shower. Other common choices include
If the ridge height is too low, there are resulted in relatively clear attics without adding a cinema room or home office –
options to increase headroom. One is to too much bracing. So if you own an older in both cases, you’ll need to think through
simply replace the existing structure with property and the roof pitch is suitable, it elements such as network cabling.
a new roof – usually by craning in either may be straightforward to convert.
attic trusses or a full modular loft. It’s Who can design my loft?
If you’re dealing with a house built after There are three main routes to go down in
1960, the roof probably consists of Fink terms of planning the perfect conversion.
If your scheme is likely to be complex or
PLAN NING PERM ISSION DO YOU NEED CONSENT? high-value, using an architect could help
maximise the project’s potential.
Many loft conversions can be completed under permitted development (PD) rights. This is because most of the changes
– aside from inserting rooflights or adding a dormer window or two – are actually internal. Here are some of the key For more straightforward schemes, a
limits on what you can achieve under PD (anything outside of these will always require a formal planning application): specialist loft conversion company might
be a better fit. These one-stop shops are
l T he total volume of any additions (eg dormers, mansards etc) must not exceed 50m2 (or 40m3 for a terraced house). able take on the planning and design
Previous roof extensions count towards this figure, but any parts of the conversion within the original roof void do not. stages, including sorting out Building
Regulations, before handing over to their
l N o additions beyond the plane of the roof slope on elevations facing the highway (rooflights are usually acceptable). in-house construction team to complete
Similarly, you can’t extend above the highest part of the existing structure without full consent. the work. An experienced builder may be
able to offer a similar level of service.
l Dormers must be set back at least 200mm from the original eaves, unless this is impracticable.
Whoever you appoint, be sure to ask for
l No new elements are allowed to overhang the outer face of the original walls. Verandas, balconies and raised and follow-up on references, and secure
platforms are not permitted unless they have been given full planning permission. detailed quotes for comparison.

l Side windows must be obscure-glazed to maintain privacy, and opening sections must be at least 1.7m above floor height.

l You must use external materials that are similar in appearance to those used on the existing house.

l PD rights do not apply to properties affected by designations, such as listed buildings or those in conservation areas.

LOFTS 35

PRACTICALITIES & BUILDING REGULATIONS

Regardless of whether your project fits of the loft in the event of fire is relatively LOFT STO RAGE ESSE NTIALS
under PD or requires full householder straightforward. For a conversion to a
planning consent, it will always need to two-storey house, the normal route is If your attic isn’t suitable for full conversion into a habitable zone,
conform to performance codes set out to create a protected corridor down the don’t give up on the idea of putting it to good use. Storage is a real
in the Building Regulations (known as main stairway to the outside using fire- issue for many householders, especially if you’ve gone for open-
Building Standards in Scotland). resisting doors and partitions. Mains- plan living elsewhere. Boarding out some or all of your roof could
powered, interlinked smoke alarms give you the perfect hideaway for lesser-used items. And with the
Of course, many homeowners will be are also required. The floor may need proliferation of clever products such as Loft Leg (page 42) you can
looking to improve on the minimum to be upgraded, too. do so whilst also upgrading insulation. These products provide a
standards. Here are some of the key raised platform onto which you can affix your boarding – so there’s
considerations for loft projects: l Thermal performance of the loft no risk of squashing the thermal protection beneath. To make best
envelope. The brunt of this work involves use of your new storage, look to install a good-quality loft ladder
l Structural stability of the joists, insulating the structure to the necessary and get a lighting circuit installed (ideally with an indicator outside
roof, foundations and so on. Unless level to meet the Building Regs (or the hatch so you can tell if you’ve left the lights on accidentally).
your home was built with attic trusses to beyond) – creating what’s known as a
begin with, it’s likely at least some parts warm roof. Best performance can be maintain a healthy environment for Left: This project
of the house’s fabric will need to be occupants. Background ventilation by Studio Octopi
attained by stripping off the can be achieved using windows with features a stepped,
beefed up to support new structural existing roof covering so you trickle vents, with rapid extraction via L-shaped dormer
loads. Thicker joists and elements of can insulate above the rafters – fans in bathrooms or other wet zones. conversion, with the
steelwork may be required, for instance, creating a wrapper that’s free Alternatively, a mechanical system main zone housing
which may raise floor heights. from thermal bridges. As long could take care of both requirements. a reading room
as you add no more than
l Access The regs for loft staircases 150mm to the roof height, itJACK HOBHOUSEl Plumbing and electrics must
are basically the same as for any flight, may be possible to complete always meet the regs. The easiest
but with one important difference: head this work under PD rights. A way to ensure this happens is to engage
height can be reduced from the normal quicker and cheaper option is to fully qualified professionals who can
2m to 1.9m at the centre of the flight, and pack insulation between and check any existing setups (including
1.8m at the edges. The reason for this is under the rafters (maintaining a ascertaining whether your boiler and/or
to account for the slope of the roof – and void between the thermal consumer unit are able to handle any
in some cases the extra leeway can avoid material and the underside of the existing additional loads) and properly design,
the need to raise the roof or drop the roof to avoid condensation). A potential carry out and certify new work.
ceiling to create enough height. downside to this route, however, is that it
will encroach on the available headroom. Building control approval
If possible, it’s best to run on from an
existing staircase in order to avoid taking l Sound insulation is all about getting There are two main routes to securing
up additional space on the floor below – the fabric of the space right. Use sound- Building Regs sign-off. The first is to
but it’s not always possible to do this. deadening materials such as acoustic submit a full plans application, which is
plasterboard at ceilings, gables and party a good choice for complex schemes as
l Fire safety and means of escape. On walls – and consider specialist glazing if you’ll get detailed structural drawings for
most projects, providing a safe route out you’re facing a major highway. the contractors to quote on and follow
during the works. The second is to serve
Packing floors and partitions with a building notice, which must be done 48
Rockwool will minimise sound transfer hours before work starts on site. This is a
between rooms and storeys. But if you’re quick and cost-effective option, but really
planning a home cinema or similar space, only viable for straightforward schemes.
then look to robust solutions such as the
use of resilient bars in floor structures Either way, the work will be inspected
(see page 43) – and consider bringing at key milestones – such as once the
in a specialist consultant. insulation is installed. If it’s all approved,
at the end of the scheme you’ll receive a
l Ventilation of the structure and living completion certificate to show the project
space to prevent condensation and meets the minimum standards.

36 LOFTS

LOFT CONVERSION COSTS

A successful loft project can increase a scheme – but as a rule you should Of course, every project is unique and
property’s value by up to around 20%, budget at least £1,250 per m2 of living you should always ensure your design
making it one of the best ways to add space for a rooflight conversion; from team or loft conversion specialist works
space and value. Our benchmark dormer around £1,500 per m2 for a dormer within your budget and undertakes a full
conversion gives an in-depth guide to project; and from circa £2,000 for a costing process at the planning phases
what you can expect to pay for a typical mansard or hip-to-gable extension. to avoid surprises once you get on site.

BENCHMARK COSTS: DORMER LOFT CONVERSION

Location Midlands Type of project Dormer loft conversion Floorspace added 43m2 Build cost £56,224
VAT £11,245 Total cost £67,469 Total cost per m2 £1,569

head height, while a pair of rooflights such as timber windows and underfloor
will provide brightness above the heating would add to the overall costs.
stairwell and in the WC area.
This model loft conversion project will Far left and left:
create 43m2 of extra living space at a The house has a Fink trussed roof, 3D representations
cost of £1,569 per m2; representing so we’ll need to crane in supporting of the benchmark
very good value for money. Natural light steels, insert extra joists, and cut and dormer loft
will be brought in via two dormers in the strengthen the rafters to create a clear conversion by
main rooms, also adding some extra void. Most of this work, and the follow- The Build It
on task of retiling the roof, will occur Estimating Service
in weeks three and four – hence this
period will put greatest pressure on
cashflow (accounting for around a third
of the project budget). Product-wise,
we’ve selected affordable but good
quality items such as PVCu windows
and radiators. Upgrading to options

Loft conversion: project schedule Elements Cost m2 Cost % Total cost

Our loft conversion is a relatively straightforward scheme, and shouldn’t take longer than Site setup £45 3% £1,939
about eight weeks. The most involved phase of works will be to reconfigure the Fink trusses Demolition (strip roof) £57 4% £2,450
using steels and new supports, along with creating the two dormer windows. Erect scaffold £67 5% £2,875
Floor joists £50 4% £2,170
Building Phase Week 1 2 3 4 5 6 7 8 Roof structure £231 18% £9,917
Structural openings £171 13% £7,350
Site setup Roof tiling £117 9% £5,018
Demolition (strip roof) First fix £221 17% £9,523
Erect scaffold Plastering £117 9% £5,022
Floor joists Second fix £130 10% £5,592
Roof structure Decoration & fit-out £75 6% £3,234
Structural openings Cleaning £26 2% £1,134
Roof tiling
First fix Subtotal £1,308 £56,224
Plastering VAT@20% £261 £11,245
Second fix
Decoration & fit-out
Cleaning

To get a detailed estimate for your loft project Grand total £1,569 £67,469
log on to www.self-build.co.uk/estimate

Build It Estimating Service figures are based on live costs for materials and labour.
For the purpose of this article we have rounded to the nearest £1.

EXTENDING UP TOP TIPS

The homeowners of this semi-detached property have benefitted from a full-width from Ashley Freer, Carai

dormer loft conversion, which has provided a new bedroom, ensuite and storage space l I t's best to use a professional
engineer when establishing the
LOCATION When Gary and Linda wanted to provide enough structural calculations of new loft
Orpington room for an elderly relative to move in, they rooms. Having suspicious-looking
were keen to maximise the potential for extra elements checked by your building
ORIGINAL HOUSE habitable space in their home's loft. The idea contractors after the design stage
SIZE was to transform the unused attic into a large new bedroom can cause massive delays.
127m2 suite for their teenage daughter, freeing up space downstairs
for the extra family member. The couple received planning l C ommunication with your chosen
SIZE OF LOFT permission for the scheme, but waited a year and a half professionals/builders both before
CONVERSION before starting works in order to get finances in place. and throughout the project is really
35m2 important. The company should
After deciding loft conversion specialist Carai was the right always recognise that they are
METHOD OF company to take their building project forward, they set a brief working on your home and make
CONSTRUCTION to create a versatile space that their daughter could use as sure that you are 100% happy
Timber frame dormer more than just a place to sleep – it needed to be somewhere with the finished result.
that she could escape to with friends, for instance. They were
PROJECT COST also keen for the new bedroom to benefit from an ensuite. l I t’s vital to do a Building Control
£45,000 application. Knowing the project
The solution was a timber frame dormer extension that has followed Building Regulations
BUILDING WORK spans the width of the property. A larger-than-standard steel will bring peace of mind for both
TOOK beam was needed to work with the size of the roof area and you and your contractor.
8-9 weeks to accommodate the large bedroom and bathroom. Carai
made sure to check in with Building Control before starting CARAI
the works to confirm everything was suitable to go ahead.
A family-run business, Carai has
To ensure the family didn’t lose storage space the loft had over a decade of experience and
originally provided, a cross-gabled section of the conversion many more years worth of combined
project has been turned into a walk-in cupboard. It’s fully knowledge in the construction
floored, insulated and plastered, featuring downlighters. industry. The skilled team can
undertake an array of projects, from
The loft conversion project took around eight weeks to simply fitting a new kitchen through
be completed. The family were so thrilled with the work that to complete renovations of listed
Carai produced that they decided to employ the company buildings. Whatever the job, it’s
to convert their garage and refurbish three bathrooms. always carried out with that family
touch – approached with a helpful,
passionate and understanding
attitude. Carai works with a skilled
team of qualified tradesman, always
finishing your project to the highest
standards because they recognise
the importance of detail and care
when working with peoples’ homes.

CARAI

Tel: 0203 731 9048

Web: www.carai.co.uk

38 LOFTS

BIGGER AND BETTER
Looking for a new place to call home away from all the city’s hustle and bustle, Judith and Struan Mackenzie came
across a renovation opportunity with the potential for a loft conversion that they couldn’t pass up

LOCATION Judith and Struan Mackenzie moved from London to possibility to expand into the eaves to create extra living
East Sussex Brighton with their son in the summer of 2015. They space for the family was a big attraction.
looked for a house that was centrally located to give
TOTAL HOUSE them the urban lifestyle they had missed – without “We asked an estate agent who we’d been in contact with
SIZE compromising on space. The couple found three properties whether he knew any good architects. The person that he
230m2 for sale, all of which were located on the same road. In the suggested came to have a look at the house,” says Judith.
end they opted for the ‘project’ house – the one that required “We both really liked him. He was interested in the project
TOTAL PROJECT the most work, but also had the most potential. and understood what we wanted to achieve.”
COST
£392,000 The Mackenzies had done some renovation work to their The couple lived in the property for nine months without
previous homes, but nothing of this scale. They hadn’t been changing anything. Although they don’t look back on this
CONSTRUCTION looking for a big scheme, but this house ticked a lot of boxes, experience fondly, it was helpful for them to spend this time
METHOD despite its condition. Before making an offer, they consulted deciding on some of the design elements that they wanted
Masonry & an architect in order to get a good sense of what could be to incorporate. “During this time we also finalised plans with
timber frame done and whether it was feasible to extend into the loft. the architect and structural engineer, achieved planning
permission and found a contractor,” says Judith.
BUILDING WORK “There was a ladder going up into the space, but it didn’t
TOOK have any floorboards or insulation, it was just full of red Gaining consent was time-consuming, but straightforward.
18 months dust from the ancient roof tiles,” says Judith. However, the In fact, the couple’s proposed plans would have qualified
as permitted development (PD), but upon their architect's

BRUCE HEMMING

EXTENSIONS 39

recommendation they applied for formal permission so there TOP TIPS
was no chance of a dispute in the future.
Homeowners Judith and Struan share their learning
The flow of the house was an important part of the brief. points for taking on a major project
There had originally been an under-stairs WC, which needed
to be relocated. The culinary zone also had an extensive l Choose your trades and professionals carefully. Our
overhaul. It used to be three separate rooms – a utility room, architect and main contractor helped us to save money
by suggesting cost-effective solutions.
There was a ladder going up into the
space, but it didn’t have any floorboards or l I t really helped to live in the property before it was
insulation, it was just full of red dust from renovated. Even though it was difficult, it gave us
the ancient roof tiles a sense of how we wanted to use the spaces and
ideas for improving what was there.

l Don’t underestimate the number of decisions that have
to be made on a major renovation and loft conversion
project, and the quick turnaround needed. Make sure
you allocate enough time to the design and research
stages, as it will be much costlier to make changes
later. Some decisions can be hard, because you are
making them on a building site without walls.

l L iving near the house while the works progressed
meant that it was always easy to attend site meetings.
We’d sometimes pop in two or three times a week
to see how things were progressing. However, we
did spend a sum of £33,000 on storage and rental
accommodation during the works.

CLOSER LOOK

kitchen and living room, with a fireplace in the dividing wall Several large rooflights have been fitted in the pitched roof
between the food preparation area and lounge. The couple of the newly-converted loft, establishing a sun-drenched
removed the chimney stack dividing the spaces and built two zone. The space accommodates a spacious bedroom
pillars for support, creating the large kitchen-diner they have for Judith and Struan’s son, plus an ensuite.
today. “We also took out the bay window that had been in
the living room to maximise the space in there,” says Judith.

In the loft, the previously cold and uninsulated space has
had a new roof frame and tiles, and has been transformed
into an ensuite bedroom for Judith and Struan’s son.

So, how did the Mackenzies find taking on an extensive
renovation and loft conversion? They agree that this kind
of scheme can present big challenges, however, living in
the ‘project house’ for a while first helped them to achieve
the dream home they’d been looking for.

40 LOFTS

LOFTS SPECIFIER

KEY A loft conversion can add valuable living space,
PRODUCTS an extra bedroom or even home office to your
property, but designing this kind of scheme requires
ROOFLIGHTS careful planning. Even if you aren’t undertaking a
conversion, fitting your loft out as a good storage
STORAGE area is another way to maximise the space.
SOLUTIONS
Your choice of materials and fixtures is key to
STRUCTURAL utilising the room and light available. Opt for
SYSTEMS products that turn redundant areas under sloping
eaves into useable elements and ensure the storey is
INSULATION thermally and acoustically insulated. Select space-
saving storage and fixtures that sit flush with the
ceiling. Make the zone bright and airy with plenty This contemporary conversion features quirky
of strategically-placed glazing, from rooflights to gable storage designed by Neville Johnson
dormer windows and floor-to-ceiling glass.

An efficient new way to convert lofts

Forget heavy steel beams and cranes, TeleBeam offers an
exciting, hassle-free route to converting your loft. It is the first
totally bespoke, prefabricated system suitable for enabling a wide
range of loft conversion projects. TeleBeam has been specially
designed for use when dealing with roof trusses in modern
buildings. Its unique load-sharing arrangement makes it ideal
for converting lofts in timber frame properties, while it can also
be a really good solution for older cut roofs, offering a shallow
floor build up that will enable you to maintain good headroom.

Installation of the telescopic floor beams is straightforward,
as the system is designed for competent DIYers as well as small
building contractors, carpenters and roofers. Detailed instructions
and drawings are provided in a step-by-step, easy to follow format
following a site survey by TeleBeam. Free installation guidance
and support is available at the company’s base in Wiltshire. For
peace of mind, the system benefits from Local Authority Building
Control Registered Details approval.

TELEBEAM
Tel: 01380 739000 Web: www.telebeam.co.uk

LOFTS 41

VELUX launches smart roof windows to help
homeowners create a healthier living environment

Leading roof window manufacturer VELUX has released a smart of overhead windows, blinds and shutters. It can even be run with
sensor-based automated window system designed to create a Siri, giving you voice control over your home’s living environment.
better, more comfortable internal climate.
The system is designed to be easily installed by homeowners
VELUX ACTIVE uses the latest technology to deliver a plug- themselves, and comes with its own app that allows people to
and-play solution that can remotely operate your roof windows, manage their property’s entire indoor climate in line with their
blinds and shutters. Developed in collaboration with French smart personal needs and external weather data, with just a few touches
home specialist Netatmo – and compatible with Android and Apple of a phone. The smart home device is also pre-programmed to
HomeKit – the system thinks and acts on occupants’ behalf by automatically open to let fresh air into your property when required.
monitoring the temperature, humidity and CO2 concentration
within a home. It can then remotely operate your roof windows to Priced from £220, VELUX ACTIVE complements the company’s
improve air quality, temperature, ventilation and sun screening in range of other smart home solutions to meet expectations for
order to achieve healthier indoor living conditions. automated, comfortable living – such as air conditioning, heating,
lighting, alarms and home security.
The first roof window setup to connect with Apple HomeKit,
VELUX ACTIVE brings together a smartphone app, an indoor VELUX
climate sensor, a departure switch and an internet gateway run by Tel: 01592 778225 Web: www.velux.com
advanced algorithms in order to deliver fully-automated operation

42 LOFTS

Loft insulation and storage

The loft can be a good solution wool insulation and
for homeowners looking to create then secure loft
more storage space in the home. boards on top.
If you decide to use an attic for this
purpose, be careful not to squash Made from
your insulation. Compressing quilt recycled materials,
insulation reduces its efficiency this innovative
by more than half, allowing heat storage product
to escape through the roof. is manufactured
in the UK. Priced
Loft Leg is a product that from £10.90 for
works to raise boards above a box of 12, you
your insulation to produce an can purchase Loft
ultra-strong storage platform. Legs in Wickes,
This creates a space ideal for Homebase,
stashing away items like suitcases Toolstation and
and Christmas decorations. Travis Perkins.
Tested to withstand weights
of over 250kg per stand, Loft Legs work to establish a surface LOFT LEG
in your loft that is strong, durable and can even be walked on. Tel: 01282 861001 Web: www.loftleg.com
Installation is straightforward, too. Simply screw each leg
structure into your ceiling joists or roof trusses, lay the mineral

Take control of your budget with the
Build It Estimating Service

If you want your extension project to run smoothly, it’s important
to ensure your finances are in order before starting work on site
by breaking ground. The Build It Estimating Service, powered by
HBXL, can give you an accurate and detailed summary of your
project costs – right down to the last roof tile!

The service will provide you with a comprehensive tailored
report, which will include live material prices from leading builder’s
merchants, along with estimated labour costs to help you better
understand your build route options. This allows you to use
this thorough cost breakdown to plan your budget and make
adjustments to ensure you stay in control of cash flow.

If you plan on taking out a mortgage, an easy-to-understand
costings overview can streamline the financial application process.
An impartial report can also come in useful when your project is
put out to tender, providing a reliable estimate that will help you
to check that your builder’s quotes are fair.

BUILD IT ESTIMATING SERVICE
Web: www.self-build.co.uk/estimate

LOFTS 43

Enhance acoustic insulation with likely to be directly located above existing bedrooms. Allowing
British Gypsum’s Silent Floor teenagers to make noise while you rest in the bedroom below or
being able to watch a late night movie while your partner prefers
One of the most common complaints about properties are noise an early night with a good book, for instance, is nolonger a concern.
transfer, from outside sources, but also between the rooms
in the house itself. When planning a loft conversion it’s important BRITISH GYPSUM
that your new room has suitable sound insulation to produce an Tel: 0115 945 1000 Web: www.british-gypsum.com
enhanced acoustic design. This way the loft can be used for
whatever activity you have in mind without needing to worry about
any disruption the added space could introduce to rooms below.

Currently, Building Regs only require you to meet a minimum
of 40dB in England and Wales or 43dB in Scotland. With British
Gypsum’s Silent Floor you can exceed the minimum standards
by up to 15dB. By significantly enhancing the acoustic performance
of your loft conversion, you’ll be able to continue to enjoy your
home the way you want to. This zoning of noisy and quiet areas
is particularly important when planning a loft conversion as it is

BASEMENT
EXTENSIONS

CREATING A SUBTERRANEAN LEVEL CAN PRESENT
A SMART SOLUTION WHEN IT COMES TO BOOSTING
YOUR PROPERTY’S FLOORSPACE. WE SHARE THE
FACTS YOU YOU NEED TO KNOW IN ORDER TO
PLAN A SUCCESSFUL BASEMENT SCHEME

KIRKWOOD MACCARTHY

BASEMENTS 45

BASEMENT INSPIRATION

ANDREW BEASLEY

JACK HOBHOUSE In this project, by RISE Design Studio, large glazed doors flood Sun-soaked courtyard Spacious subterranean
the subterranean kitchen-diner with natural brightness Giles and Pike Architects developed culinary zone
the design for this spacious and Granit Architects were behind DAVID BUTLER PHOTOGRAPHY
Digging down can be an effective way to establish light-filled basement extension. the design of this kitchen-diner
extra space in your home – particularly if you’ve The subterranean storey features HEATHER HOBHOUSE basement extension. A glazed
already exhausted opportunities for expansion access to its own sunken outdoor double height space ensures the
above ground. If you live in an area where land courtyard, which is complete with underground zone is filled with
values are high, you may be keen to avoid eating into an external seating area. natural light throughout the day.
precious garden space by constructing a conventional
extension at ground floor level. Plus, houses in designated Underground living space Natural and artificial light
zones such as conservation areas, or those with listed status Flush walk-on rooflights have been This underground living room,
may struggle to attain planning consent for projects that fitted on the ground floor of this designed by Jo Cowan Architects,
alter the appearance of the streetscape. In these situations, house, both inside and out. This features a well thought-out electric
developing below ground can provide a viable alternative. creates a sleek, flush finish on that illumination scheme. Ambient and
“If you specifically want a darker room with good sound storey and bathes the subterranean accent fittings, as well as spotlights,
insulation, like a home cinema, gym or playroom, a new level in sunshine. The scheme have been incorporated to create a
basement can provide an excellent solution,” says Sophie was designed by Hut Architecture. visually appealing effect.
Determann, senior architect at Hut Architecture.
Whatever function the zone will perform, remember that
this type of project involves a raft of extra practicalities and
potential complications that don’t apply to typical extension
schemes. Ventilation, waterproofing and light are all key
components. Subterranean development tends to be more
expensive and time-consuming, too. That being said, a well-
designed space can provide a spectacular addition to your
home. Here are the main considerations to bear in mind.

46 BASEMENTS

DESIGN & ASSESSMENT

Above: In this Before you and boreholes, laboratory testing of soil Above: These basement plans were
scheme, by UV approach any samples and establishing groundwater developed by Hackett Holland Architects
Architects, natural architects, do your levels.” This information is vital when it
light is channelled research and comes to designing a suitable structure Waterproofing is a key practical issue.
into the basement dedicate time to for the site. Flood risk assessments and Though there’s a variety of systems that
via the addition your design brief, light surveys should be carried out, too. are designed to keep water out, most
of fixed walk-on focusing on the projects work on the principle that it will
rooflights functions the In many cases, the level of complexity get in. A plastic cavity drainage liner is
basement should involved in the project is linked to the applied to the internal face of the zone’s
perform. Will it be characteristics of the property you’re concrete wall. This catches any water that
used as a zone for extending. Access can be a common penetrates through the concrete, where
utility areas, plant issue, for instance, especially if you live it runs down into the ground to a sump
rooms and a gym, in the middle of a terraced row. “One of collection system. The water is then
or do you envision the most common logistical complications pumped up to a drain at ground level.
a bright and airy is getting the excavated soil out and
subterranean underpinning the existing structure in Light is a vital element for habitable
kitchen-diner? a safe, efficient way,” says James Munro, subterranean zones. Walk-on rooflights
a director at Granit Architects. that sit flush with the floor surface above
It’s worth doing – either internally or externally – are one
your homework to Many would-be extenders also need to solution. Sunpipes can also be fitted to
see if there are any overcome the hurdles involved in dealing channel natural brightness into the space.
constraints on your with disgruntled neighbours, as the works Another method is to lower part of the
property that could affect your route and are likely to cause disruption. If you live in outdoor zone to basement level and install
the permissions you’ll need. “See if any a terraced or semi-detached house, the glazed doors leading out to a patio, with
similar schemes have been carried out Party Wall Act will come into play. This external stairs leading up to the rest of the
in your area,” says Sophie. “If any of your safeguards adjoining properties by calling garden. If that’s not an option, a lightwell –
neighbours have basements, then you’ll on you to notify everyone involved two a waterproofed channel that leads up
know that it’s technically possible and months before excavation begins. If to the outside – can help direct sunlight
that there’s a planning precedent.” neighbours aren’t happy with the scheme, inside. “We also look at double height
As well as a professional designer, it’s you may need to bring in a specialist Party spaces to connect the ground floor to
likely that you’ll need to hire a structural Wall surveyor to negotiate a solution. the basement,” says James.
engineer to handle the calculations and
surveys. “A geotechnical assessment is In terms of construction, removing the
required at an early stage,” says Johnny ground floor to dig down is the most
Holland, director at Hackett Holland common route forwards if you’re building
Architects. “This involves digging trial pits a basement beneath an existing dwelling.
“You scoop out all the earth up to the line
Cellar conv ersion s of the walls around the sides of the house
before underpinning them,” says Sophie.
If your property already has a cellar, converting this zone into This involves building a concrete support
a habitable area can be a cost-effective way to boost your beneath the walls to ensure they’re
home’s floor space. Damp is one of the key issues likely to securely propped up, casting the concrete
come into play here. If waterproofing work is all that’s needed, in metre-long sections to hold back the
your project shouldn’t require formal planning consent. weight of the surrounding ground.

Ceiling heights are also a vital factor. As a minimum, you Alternatively, if you’re keen to retain the
want nothing less than 2.3m – and this is where many cellar ground floor structure and access is only
conversion schemes come unstuck. If excavation work is available from the front of the property,
required to gain the extra headroom, you’ll need to attain the construction team can dig trenches
formal planning consent. At this point, you’re likely to see beneath the house to excavate. “Then
the budget shoot up – particularly when you start factoring they can tunnel underneath and underpin
in other elements, such as access and natural light. that way. Sometimes this requires more
steelwork to support the ground floor
that’s being retained, so it can be slower
and more expensive,” says Sophie.

BASEMENTS 47

PLANNING & BUILDING REGULATIONS

must not be a situation where occupants Left: Designed by
could become trapped in the basement.” Hogarth Architects,
this capacious
Ideally, a separate flight leading out of basement extension
the zone should be installed. Alternative comprises an open-
solutions could be a ladder leading up plan sleeping and
to a window or door, if these units meet bathing zone, as
the requirements in terms of size. Some well as a walk-in
councils have accepted sprinkler and dressing area
misting systems as a substitute for an
approved exit. The basement’s ceiling
will also need to be made fire retardant,
which can be achieved by applying a
non-combustible material to its surface.

While it used to be possible to develop Building Regulations. “The zone should Left: Glazed doors lead out to a sunken courtyard area in this
subterranean zones without having to conform to the required standards for basement, which was designed by Jo Cowan Architects. Above:
apply for formal planning permission, waterproofing, drainage, ventilation and This contemporary scheme was designed by West Architecture.
the likelihood of that happening today insulation,” says Johnny. Providing a clear Glazed doors, floor to ceiling fixed windows and clerestory units
is extremely slim. Many local authorities – escape route in the event of a fire is also ensure the subterranean space is flooded with natural brightness
particularly those in built-up urban areas a key stipulation laid out in the guidelines,
– are tightening up on underground and is something your building control Vent ilation
development due to numerous issues officer or approved inspector will want
concerning the creation of luxurious, to see. “This is one of the most important Despite all the waterproofing techniques used in modern
multi-level iceberg basements. considerations at the design stage,” says basements, the air in this area of the home tends to contain
Johnny. “If a fire on the upper levels more moisture than spaces above ground. That’s why
“Historically, basements could often spreads to the access staircase, there an efficient ventilation system is essential, as laid out by
be constructed under your Permitted Building Regulations. If it’s not possible to install a door or
Development (PD) rights, provided there an opening window, some form of mechanical ventilation
were no visual alterations made above setup will be required. “On a recent project we used a
ground level, like lightwells or external kitchen extractor to purge stale air and installed a vent
windows,” says Johnny from Hackett that opened up beneath the garden decking to provide
Holland. “If these are necessary – as a fresh supply,” says Sophie from Hut Architecture. There
they often are if the space is to become are also systems that turn on automatically when they
a habitable room – planning consent is detect that humidity levels in the basement are too high.
automatically required. Some councils
have now withdrawn PD allowances
in any event.” Building work carried out
on existing underground storeys may
be covered by PD rights, but it is always
worth checking with your local authority
and attaining a Lawful Development
Certificate (LDC) before going ahead
with the construction work.

Like all other areas of the home, your
basement will need to comply with

48 BASEMENTS

BASEMENT CONVERSION & EXTENSION COSTS

Pound for pound, basement projects tend to be the most As a guide, a straightforward cellar conversion completed
expensive route to adding more space. Nevertheless, in on a largely DIY basis could cost as little as £1,000 per m2;
the right circumstances converting or extending to create but as soon as any underpinning is required, that figure will
a habitable basement can represent very good value for shoot up. If you’re retrofitting a completely new living space
money – especially in cities and other tight urban locations, then prices are likely to start from £2,500 per m2 and could
where garden space is likely to be at a premium and an rise above £4,000 per m2, depending on the waterproofing
above-ground addition might prove counterproductive. requirements and fit-out spec for your project.

BENCHMARK COSTS: BASEMENT CONVERSION

Location Midlands Type of Elements Cost m2 Cost % Total cost
project Basement conversion
Floorspace added 33.9m2 Preliminaries & site preparation £315 14% £10,668
Build cost £74,787 VAT Demolition works to ground floor £97 4% £3,277
£14,957 Total cost £89,744 Underpinning & foundations £993 45% £33,659
Total cost per m2 £2,647 Slab & waterproofing £78 4% £2,642
Brickwork, internal walls
Our model basement project & structural openings £129 6% £4,392
is a conversion of an existing Drainage £10 1% £350
cellar. The project involves lowering the floor slightly to create First fix work (incl. underfloor heating) £289 13% £9,781
sufficient headroom, which means we’ll need to underpin Plastering £134 6% £4,558
in addition to waterproofing and fitting out the space. The Second fix work
floorplan is 33.9m2, which gives us enough room to create (incl. door and staircase installation) £90 4% £3,058
a decent ancillary living area, a small bathroom and a store Internal fit-out & decoration £71 3% £2,402
– without making the property too bottom heavy.
Using the Build It Estimating Service, we’ve priced the Subtotal £2,206 £74,787
job at £89,744 including labour, plant, materials and VAT. VAT@20% £441 £14,957
We expect the works to take around 12 weeks including
preparation and clean up. A significant portion of the costs Grand total £2,647 £89,744
for this kind of extension will be for the underpinning (in this
case 45%) – so there’s a heavy cash flow requirement in
the first few weeks. Key works during this phase include
excavation, installation of temporary supports and the
concrete pour to form the new basement foundation walls.
To get a detailed estimate for your project log
on to www.self-build.co.uk/estimate

Project schedule: Building Phase Week 1 2 3 4 5 6 7 8 9 10 11 12
Basement conversion Preliminaries & prep

Our model scheme is a conversion, so it Demolition
should proceed quicker than a new basement Underpinning
extension. Nevertheless, we need to lower the Foundations
floor and underpin – so it will still take longer
than a typical above-ground addition. This 12- Slab & waterproofing

week schedule is based on the assumption Brickwork, internal walls & openings

that site conditions are favourable and there Drainage

is straightforward access for the work. First fix

Plastering

Second fix

Internal fit-out & decoration

SUBTERRANEAN EXTENSIONS 49
LIVING SPACE
TOP TIPS
Nicholas and Laura Turner boosted their London home’s living space by
developing a spacious new storey beneath their back garden from Darren Wilks,
managing director
LOCATION Keen to boost the living space in their London of Basement
London home, Nicholas and Laura Turner decided to add Structures
a basement as part of their renovation scheme.
EXTENSION SIZE They worked closely with Mitchell Berry Architects G It’s vital to engage a structural
100m2 to develop the design for the project, and brought Basement engineer with plenty of experience
Structures on board to handle the construction. working on basement projects. He
TOTAL HOUSE or she will be able to handle the
SIZE Planning permission was required for the project, as the surveys and calculations for you.
325m2 works involved excavation and underpinning of the original
house. The couple also had to bring in a Party Wall surveyor G Coordinate with a skilled architect
METHOD OF to negotiate agreements with the neighbours. to develop a detailed design that
CONSTRUCTION you are happy with, and that ticks
Excavation and In order to maximise available space, the new storey extends all the boxes on your brief.
underpinning beyond the footprint of the original house, underneath the
garden and right back to the rear boundary of the property. G Work closely with a specialist
PROJECT COST This strategy has allowed the Turners to enlarge the dwelling’s basement contractor before
£600,000 living area significantly, without eating into the existing outdoor starting on site. Try and get
zone. The spacious new subterranean level has been divided the finer details of the project
BUILDING WORK into several areas, including a gym, home office, cinema and nailed down early on, and most
TOOK utility room. A lightwell at the front of the basement bathes companies will be able to provide
Six months the underground storey with sunshine. The secondary fire you with a fixed cost for the job.
escape has also been positioned here in order to meet Changing your mind later on in
Building Regulations regarding fire safety. the process can lead to delays
and additional fees.
As the renovation work was so extensive, Nicholas and
Laura decided to move out for the duration of the build. In BASEMENT
order to excavate, the Basement Structures team removed the STRUCTURES
original ground floor of the property and tunnelled underneath
the garden. A cavity drain membrane system was used to Based in Wimbledon, this
waterproof the new subterranean structure. reputable company specialises
in subterranean conversions and
extensions, covering the M25 and
Home Counties region. The firm's
director, Darren Wilks, has more
than 20 years’ experience working
on this kind of project. Basement
Structures provides specialist
construction services for both
new builds and extensions.
Passionate about establishing
bespoke underground spaces to
suit homeowners’ requirements,
reliable customer service is at the
heart of the company’s ethos.

BASEMENT STRUCTURES
Tel: 020 8405 6400
Web: www.basementstructures.co.uk

50 BASEMENTS

BASEMENTS SPECIFIER

KEY The products chosen for your new basement storey Designed by Robert Dye Architects and built by
PRODUCTS should contribute towards creating a comfortable Peake Projects, this cellar was made habitable
and well-illuminated living space. An energy- by excavating down to create more headroom
FLOOR GLAZING efficient underfloor heating system is a popular
choice, for instance, while ensuring your space
UNDERFLOOR doesn’t fall foul of damp is a major consideration.
HEATING
Innovative glazing products, such as glass floors,
STAIRCASES can be a great way to increase the amount of natural
light in an underground room, while adding a wow-
FIRE SAFETY factor architectural feature. Alternatively, you could
opt to utilise a dark space by adding a state-of-the-
ENTERTAINMENT art entertainment suite for your very own home
SYSTEMS cinema experience. However you plan to use it,
don’t forget to protect your basement by including
safety solutions in your designs too. MARK NICHOLSON

Transform your basement into a home cinema and media room

Thanks to excellent sound insulation qualities and, in many cases,
less natural light, subterranean storeys provide an ideal space for
home entertainment suites. New Wave AV transforms basements,
lofts, garages and spare rooms into media zones and dedicated
home cinemas. As a result, occupants can experience film, gaming
and television on the big screen, just as the director intended.

The company’s full turnkey package provides property owners
with a one stop shop for home cinemas, carrying out the works for
audio, projection, seating, construction and decoration. New Wave
AV’s Kent showroom has a dedicated home cinema zone where
visitors can experience Dolby Atmos in action. Alongside the firm’s
demonstration rooms, there’s a wide range of inspirational projects
to help you get ideas for your own movie theatre suite.

New Wave AV’s experts can assist you in design, construction,
finish and installation. The team can also put together system
designs and 3D renders for you to visualise the final result.

NEW WAVE
Tel: 01732 852 500 Web: www.newwaveav.co.uk