House extension cost
in Kensal Green.
Kensal Green — NW10 — north-west of Notting Hill across the canal. A mix of Victorian terraces, the famous cemetery, and pockets of newer housing developments.
What makes extension work in Kensal Green distinct.
Housing: Victorian and Edwardian terraces, with some 1920s housing on the northern edges.
Planning: Kensal Green Cemetery Conservation Area covers the cemetery and immediately adjacent streets; most of NW10 retains PD rights outside it.
Applications go to LB Brent. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — NW10 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Kensal Green 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 Kensal Green and beyond.
Send me the guide.
What Kensal Green homeowners ask us.
How much does a house extension cost in Kensal Green in 2026?
Typical 2026 Kensal Green 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 Kensal Green multiplier (0.92×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Kensal Green?
Kensal Green Cemetery Conservation Area covers the cemetery and immediately adjacent streets; most of NW10 retains PD rights outside it. 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 Brent.
What extension type works best for Kensal Green houses?
Victorian and Edwardian terraces, with some 1920s housing on the northern edges. 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 Kensal Green?
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 Brent processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Kensal Green homeowners out on extensions?
In NW10 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 Kensal Green extensions?
Yes — Kensal Green is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 6.5km from Kensal Green. We've delivered extensions across the NW10 postcode and our subcontractor network covers Brent. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Kensal Green’s neighbours.
Twenty minutes on site in Kensal Green.
On us.
Nick Elias RIBA and Vladimir will visit your Kensal Green 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 Kensal Green extension using the same 2026 rate card we quote real clients with.
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