House extension cost
in Roehampton.
Roehampton — SW15 — south-west of Putney towards Richmond Park. A mix of post-war housing estates, 1930s semis and pockets of older village housing around Roehampton Lane.
What makes extension work in Roehampton distinct.
Housing: 1930s semis with hipped roofs, post-war estate housing, and a small core of older village cottages.
Planning: Roehampton Village Conservation Area covers the historic core; the estates around it sit outside it but have specific design policies.
Applications go to LB Wandsworth. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — SW15 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Roehampton multiplier (0.90×) 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 Roehampton and beyond.
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What Roehampton homeowners ask us.
How much does a house extension cost in Roehampton in 2026?
Typical 2026 Roehampton ranges (inc. design, planning, build, contingency & VAT): side-return extensions £81k–£144k; single-storey rear £99k–£189k; wraparound £153k–£288k; double-storey rear £162k–£342k; basement £225k–£675k. The Roehampton multiplier (0.90×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Roehampton?
Roehampton Village Conservation Area covers the historic core; the estates around it sit outside it but have specific design policies. 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 Wandsworth.
What extension type works best for Roehampton houses?
1930s semis with hipped roofs, post-war estate housing, and a small core of older village cottages. 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 Roehampton?
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 Wandsworth processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Roehampton homeowners out on extensions?
In SW15 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 Roehampton extensions?
Yes — Roehampton is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 4.0km from Roehampton. We've delivered extensions across the SW15 postcode and our subcontractor network covers Wandsworth. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Roehampton’s neighbours.
Twenty minutes on site in Roehampton.
On us.
Nick Elias RIBA and Vladimir will visit your Roehampton 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.
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Price your Roehampton extension using the same 2026 rate card we quote real clients with.
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