House extension cost
in Acton.
Acton — W3 — west of Shepherd's Bush. A large, varied area with Victorian and Edwardian terraces around Acton Green and Acton Central, plus interwar housing on the western edges.
What makes extension work in Acton distinct.
Housing: Edwardian and inter-war terraces and semis, with some Victorian stock around the older village centres.
Planning: Acton Park, Bedford Park (overlapping with Chiswick) and Mill Hill Park conservation areas cover specific pockets.
Applications go to LB Ealing. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — W3 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Acton multiplier (0.92×) 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 Acton and beyond.
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What Acton homeowners ask us.
How much does a house extension cost in Acton in 2026?
Typical 2026 Acton ranges (inc. design, planning, build, contingency & VAT): side-return extensions £83k–£147k; single-storey rear £101k–£193k; wraparound £156k–£294k; double-storey rear £166k–£350k; basement £230k–£690k. The Acton multiplier (0.92×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Acton?
Acton Park, Bedford Park (overlapping with Chiswick) and Mill Hill Park conservation areas cover specific pockets. 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 Ealing.
What extension type works best for Acton houses?
Edwardian and inter-war terraces and semis, with some Victorian stock around the older village centres. 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 Acton?
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 Ealing processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Acton homeowners out on extensions?
In W3 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 Acton extensions?
Yes — Acton is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 5.0km from Acton. We've delivered extensions across the W3 postcode and our subcontractor network covers Ealing. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Acton’s neighbours.
Twenty minutes on site in Acton.
On us.
Nick Elias RIBA and Vladimir will visit your Acton 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 Acton extension using the same 2026 rate card we quote real clients with.
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