House extension cost
in Soho.
Soho — W1 — central London's entertainment and creative district. Residential stock is limited and predominantly upper-floor flats above commercial premises, plus a few intact Georgian terraces.
What makes extension work in Soho distinct.
Housing: Mixed-use Georgian terraces (upper-floor residential), small mews properties, and listed buildings.
Planning: Soho Conservation Area covers virtually the whole neighbourhood. High listed-building density.
Applications go to City of Westminster. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — W1 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Soho multiplier (1.22×) 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 Soho and beyond.
Send me the guide.
What Soho homeowners ask us.
How much does a house extension cost in Soho in 2026?
Typical 2026 Soho ranges (inc. design, planning, build, contingency & VAT): side-return extensions £110k–£195k; single-storey rear £134k–£256k; wraparound £207k–£390k; double-storey rear £220k–£464k; basement £305k–£915k. The Soho multiplier (1.22×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Soho?
Soho Conservation Area covers virtually the whole neighbourhood. High listed-building density. 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 City of Westminster.
What extension type works best for Soho houses?
Mixed-use Georgian terraces (upper-floor residential), small mews properties, and listed buildings. 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 Soho?
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. City of Westminster processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Soho homeowners out on extensions?
In W1 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 Soho extensions?
Yes — Soho is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 6.5km from Soho. We've delivered extensions across the W1 postcode and our subcontractor network covers Westminster. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Soho’s neighbours.
Twenty minutes on site in Soho.
On us.
Nick Elias RIBA and Vladimir will visit your Soho 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 Soho extension using the same 2026 rate card we quote real clients with.
Price my Soho extension →