House extension cost
in Fulham.
Fulham is where we work from — the studio is on Dawes Road, SW6, and our directors visit every Fulham site on foot. The housing is overwhelmingly late-Victorian terrace, which means the same handful of questions come up on nearly every job: what the roof form allows, how far the rear can go, and which of the borough's designations your address sits inside.
What makes extension work in Fulham distinct.
Housing: Late-Victorian terraced homes on quiet residential streets, with period features, rear gardens and loft potential. Rear outriggers are common, and so are the side-return infills and L-shape dormers they invite.
Planning: Bishop's Park, Walham Green, Moore Park, Peterborough and Parsons Green are all conservation areas, so a large share of SW6 addresses sit inside one. Separately, Hammersmith & Fulham has a borough-wide Article 4 direction in force since 26 April 2018 which removes permitted development for basement development everywhere in the borough — a basement is a planning application wherever you are. It does not touch lofts or rear extensions; your conservation designation is what governs those.
Applications go to LB Hammersmith & Fulham. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — SW6 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Fulham multiplier (1.00×) reflects local labour, scaffolding logistics, conservation requirements and finish expectations.
The 2026 London Extension Cost Guide.
Borough-by-borough pricing, a full £200k cost breakdown, PD vs full planning explained, and the seven hidden costs to watch for in Fulham and beyond.
Send me the guide.
What Fulham homeowners ask us.
How much does a house extension cost in Fulham in 2026?
Typical 2026 Fulham ranges (inc. design, planning, build, contingency & VAT): side-return extensions £90k–£160k; single-storey rear £110k–£210k; wraparound £170k–£320k; double-storey rear £180k–£380k; basement £250k–£750k. The Fulham multiplier (1.00×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Fulham?
Bishop's Park, Walham Green, Moore Park, Peterborough and Parsons Green are all conservation areas, so a large share of SW6 addresses sit inside one. Separately, Hammersmith & Fulham has a borough-wide Article 4 direction in force since 26 April 2018 which removes permitted development for basement development everywhere in the borough — a basement is a planning application wherever you are. It does not touch lofts or rear extensions; your conservation designation is what governs those. Outside conservation areas, single-storey rear extensions up to 3m (terrace/semi) or 4m (detached) usually qualify for permitted development. Side-returns, wraparounds, double-storey extensions and anything in a conservation area need full planning. Applications go to LB Hammersmith & Fulham.
What extension type works best for Fulham houses?
Late-Victorian terraced homes on quiet residential streets, with period features, rear gardens and loft potential. Rear outriggers are common, and so are the side-return infills and L-shape dormers they invite. On this housing stock, the most common 2VP extension is a single-storey rear or wraparound — adding 20–35 m² of open-plan kitchen-diner. Double-storey extensions become viable on properties with rear gardens deep enough to absorb the additional volume without overshadowing.
How long does an extension take in Fulham?
Allow 8–12 weeks for design and planning (longer in conservation areas), then 16–22 weeks on site for a single-storey, 22–30 weeks for a wraparound or double-storey, and 28–40 weeks for a basement. LB Hammersmith & Fulham processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Fulham homeowners out on extensions?
In SW6 the top items are: party wall awards (£1,000–£3,000 per neighbour — common on terraced streets), build-over agreements with Thames Water (£300–£1,500 where drains run beneath the proposed extension), conservation officer consultations, structural engineer fees, drainage and asbestos surveys, and VAT at 20% on top of the base build cost. All of these are itemised in our itemised quotation.
Does 2VP work on Fulham extensions?
Yes — Fulham is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 0.0km from Fulham. We've delivered extensions across the SW6 postcode and our subcontractor network covers Hammersmith & Fulham. Free site visit, itemised quotation, 12-month workmanship warranty on second-fix fittings on the finished work — with an optional 10-year HomePro guarantee on request, arranged with HomePro and paid directly to them at 2.5% of the contract value.
Extension pricing for Fulham’s neighbours.
Twenty minutes on site in Fulham.
On us.
Nick Elias RIBA and Vladimir will visit your Fulham home, walk the site, check planning constraints, advise on PD vs full planning, and give you a realistic budget and programme — even if an extension isn’t the right move.
One number. Sixty seconds. No callback.
Price your Fulham extension using the same 2026 rate card we quote real clients with.
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