House extension cost
in Wimbledon.
Wimbledon — SW19 — south-west London with a mix of village character around the common and Victorian/Edwardian terraces on the slopes below. Strong loft-conversion demand from family buyers.
What makes extension work in Wimbledon distinct.
Housing: Edwardian terraces and semis on the slopes, Victorian villas around the village, and 1920s/30s housing on the southern fringes.
Planning: Wimbledon Village, John Innes and Hartfield Road conservation areas cover specific pockets. Most of central SW19 retains PD rights.
Applications go to LB Merton. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — SW19 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Wimbledon multiplier (0.93×) 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 Wimbledon and beyond.
Send me the guide.
What Wimbledon homeowners ask us.
How much does a house extension cost in Wimbledon in 2026?
Typical 2026 Wimbledon ranges (inc. design, planning, build, contingency & VAT): side-return extensions £84k–£149k; single-storey rear £102k–£195k; wraparound £158k–£298k; double-storey rear £167k–£353k; basement £233k–£698k. The Wimbledon multiplier (0.93×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Wimbledon?
Wimbledon Village, John Innes and Hartfield Road conservation areas cover specific pockets. Most of central SW19 retains PD rights. 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 Merton.
What extension type works best for Wimbledon houses?
Edwardian terraces and semis on the slopes, Victorian villas around the village, and 1920s/30s housing on the southern fringes. 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 Wimbledon?
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 Merton processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Wimbledon homeowners out on extensions?
In SW19 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 Wimbledon extensions?
Yes — Wimbledon is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 6.0km from Wimbledon. We've delivered extensions across the SW19 postcode and our subcontractor network covers Merton. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Wimbledon’s neighbours.
Twenty minutes on site in Wimbledon.
On us.
Nick Elias RIBA and Vladimir will visit your Wimbledon 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 Wimbledon extension using the same 2026 rate card we quote real clients with.
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