
House extensions in South West London.
Fulham · SW6 · Fulham Victorian houseCase study
Glazed kitchens, infilled side passages and garden rooms for SW terraces. Our studio sits on Fulham High Street, close to every site.
Wider kitchens, brighter backs.
- Outriggers
- The slim back wing on Victorian terraces
- Three boroughs
- Each with its own tests for additions
- Steel and glass
- Made to measured site drawings
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle house and kitchen extensions in South West London SW, under one contract. A rear kitchen extension typically runs £160k to £250k. A side return extension typically runs £140k to £220k. Call 020 7731 6841, and a budget estimate typically follows within seven days.
Behind most Victorian terraces between Belgravia and Parsons Green sits a slim outrigger. Beside it runs a dark, damp passage nobody uses. Infilling that strip gives a kitchen real width.
Glazing does the rest. A frameless rooflight along the old boundary pulls daylight deep into the plan. Sliding doors then open the dining space onto the garden.
Each borough draws its line differently. Kensington and Chelsea compares your proposal with neighbouring additions along the row. Hammersmith and Fulham allows some modest single storey schemes under permitted development.
Our engineers size the steels before the groundworkers arrive. Drainage is rerouted, footings poured and the shell made weathertight before joinery begins.
Where the line falls for SW additions.
- Council
- Royal Borough of Kensington and Chelsea for Chelsea and South Kensington. Hammersmith and Fulham for Fulham.
- Garden level
- Policy CD13 holds a rear addition to the line set by neighbouring extensions.
- Rear additions
- Policy CD13. Keep to the neighbours’ rear line, and stay below the eaves.
- Merging flats
- Policy HO1 does not allow existing self-contained homes to be merged into one.
- Mansion blocks
- Flats there carry no householder rights to extend.
Source: Kensington and Chelsea’s Local Plan 2024, Policies HO1 and CD4 to CD13. Read on 7 October 2026. Policies change, so we read them again for your address.
Extensions built in the SW postcodes.

Fulham·House
Fulham Victorian house
A glazed rear extension on a Victorian house in Fulham, SW6.
See the project
Fulham·New build
Fulham, four new-build houses with basements
A kitchen under a long rooflight, in a new Fulham house, SW6.
See the project
Fulham·House
Fulham house, refurbished throughout
A galley kitchen under a rooflight in a Fulham house, SW6.
See the projectCase study
What a house extension costs in South West London.
£160k to £250kA rear kitchen extension. A project total, from our 2026 cost guide.
£200k to £320kA wraparound extension. A project total, from our 2026 cost guide.
SW extensions often wait on conservation consent before the build starts.
Both figures are project totals.
Fees, party wall costs, contingency and VAT sit outside them.
What South West London owners ask about extensions.
In South West London
- Every service in Chelsea
- Loft conversion in South West London
- Party wall surveying in South West London
- Planning consultants in South West London
- Architectural design in South West London
Extensions nearby
- House extensions across London
- House extensions in Fulham
- House extensions in Chelsea
- House extensions in Kensington
- House extensions in Clapham
- House extensions in Notting Hill
- House extensions in South Kensington
- House extensions in Knightsbridge
- House extensions in Belgravia
- House extensions in Mayfair
- House extensions in Holland Park
- House extensions in Marylebone
- House extensions in St John’s Wood
- House extensions in Hampstead
- House extensions in Highgate
- House extensions in Primrose Hill
- House extensions in Earl’s Court
- House extensions in Pimlico
- House extensions in Westminster
- House extensions in Weybridge
- House extensions in Cobham
- House extensions in Oxshott
- House extensions in West London
- House extensions in North London
- House extensions in South London
- Chelsea
- Fulham
- South Kensington
- Belgravia
Further reading, from the blog
Can a Fulham side passage be infilled without an application?
Some modest rear schemes qualify as permitted development.
Conservation areas such as Parsons Green narrow those rights considerably.
What sets the depth of an extension in Chelsea or Earl’s Court?
Neighbouring additions along the row usually do.
Policy CD13 holds yours to the line they establish.
Can a garden flat in a converted SW house be extended?
Possibly, though flats lack householder permitted development rights.
Full planning consent and the freeholder’s licence are both required.
Which neighbours receive notices before footings are dug?
Owners sharing the boundary wall, plus those near the excavation.
Notice periods run one or two months, so we serve early.
How much does a wraparound cost across the SW postcodes?
Our 2026 cost guide gives £200k to £320k as a project total.
Professional fees and VAT come on top.
See it builtNear South West London
See it built.
Finished homes, designed, priced and built by NU.

Chelsea · SW3 Townhouse
Chelsea basement and extension
A new basement, a kitchen extension and a full interior renovation.
Case study

Kensington · W8 New build
Kensington new-build houses
Two new-build houses with triple basements, built under one contract.
Case study

Marylebone · W1 Apartment
Marylebone listed apartment
A modern marble kitchen, set inside Georgian rooms.
Case study
Tell us about your home in South West London.
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- Already have an architect or designer? We build to their design. Working with your designer
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