House extension cost
in Barons Court.
Barons Court — the leafy pocket of W14 between Hammersmith and West Kensington. The grid of red-brick Queen Anne and Edwardian terraces makes it one of the most photogenic loft markets in west London.
What makes extension work in Barons Court distinct.
Housing: Red-brick Queen Anne and Edwardian three-storey terraces with bay windows and tile-hung gables.
Planning: Barons Court Conservation Area covers virtually all of W14. Expect full planning rather than PD on every loft application.
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 — W14 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Barons Court multiplier (1.08×) 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 Barons Court and beyond.
Send me the guide.
What Barons Court homeowners ask us.
How much does a house extension cost in Barons Court in 2026?
Typical 2026 Barons Court ranges (inc. design, planning, build, contingency & VAT): side-return extensions £97k–£173k; single-storey rear £119k–£227k; wraparound £184k–£346k; double-storey rear £194k–£410k; basement £270k–£810k. The Barons Court multiplier (1.08×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Barons Court?
Barons Court Conservation Area covers virtually all of W14. Expect full planning rather than PD on every loft application. 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 Barons Court houses?
Red-brick Queen Anne and Edwardian three-storey terraces with bay windows and tile-hung gables. 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 Barons Court?
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 Barons Court homeowners out on extensions?
In W14 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 fixed-price quote.
Does 2VP work on Barons Court extensions?
Yes — Barons Court is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 1.4km from Barons Court. We've delivered extensions across the W14 postcode and our subcontractor network covers Hammersmith & Fulham. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Barons Court’s neighbours.
Twenty minutes on site in Barons Court.
On us.
Nick Elias RIBA and Vladimir will visit your Barons Court 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 Barons Court extension using the same 2026 rate card we quote real clients with.
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