House extension cost
in Ealing.
Ealing — W5 — known as the 'Queen of the Suburbs' for its leafy streets and Edwardian housing stock. One of west London's largest residential areas, with strong loft conversion demand.
What makes extension work in Ealing distinct.
Housing: Edwardian terraces and semis dominate, with pockets of Arts & Crafts villas and 1920s housing.
Planning: Ealing Common, Ealing Green and Brentham Garden Estate conservation areas. Brentham Garden Estate has full Article 4 in place.
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 — W5 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Ealing 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 Ealing and beyond.
Send me the guide.
What Ealing homeowners ask us.
How much does a house extension cost in Ealing in 2026?
Typical 2026 Ealing 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 Ealing multiplier (0.93×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Ealing?
Ealing Common, Ealing Green and Brentham Garden Estate conservation areas. Brentham Garden Estate has full Article 4 in place. 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 Ealing houses?
Edwardian terraces and semis dominate, with pockets of Arts & Crafts villas and 1920s housing. 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 Ealing?
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 Ealing homeowners out on extensions?
In W5 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 Ealing extensions?
Yes — Ealing is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 6.0km from Ealing. We've delivered extensions across the W5 postcode and our subcontractor network covers Ealing. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Ealing’s neighbours.
Twenty minutes on site in Ealing.
On us.
Nick Elias RIBA and Vladimir will visit your Ealing 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 Ealing extension using the same 2026 rate card we quote real clients with.
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