House extension cost
in Holland Park.
Holland Park — W11 — north of Kensington High Street. The grand stucco terraces around the park and the elegant garden squares behind it are some of the most architecturally significant housing in London.
What makes extension work in Holland Park distinct.
Housing: Five- and six-storey stucco-fronted villas and terraces, plus garden squares with large detached houses.
Planning: Holland Park Conservation Area covers the entirety of W11 around the park. Many properties are listed. Listed-building consent and full planning are standard requirements.
Applications go to Royal Borough of Kensington & Chelsea. We submit on your behalf and handle party wall awards, build-over agreements and conservation officer correspondence end-to-end.
The five extension types — W11 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Holland Park 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 Holland Park and beyond.
Send me the guide.
What Holland Park homeowners ask us.
How much does a house extension cost in Holland Park in 2026?
Typical 2026 Holland Park 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 Holland Park multiplier (1.22×) reflects local labour rates, scaffold logistics and finish expectations.
Do I need planning permission for an extension in Holland Park?
Holland Park Conservation Area covers the entirety of W11 around the park. Many properties are listed. Listed-building consent and full planning are standard requirements. 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 Royal Borough of Kensington & Chelsea.
What extension type works best for Holland Park houses?
Five- and six-storey stucco-fronted villas and terraces, plus garden squares with large detached houses. 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 Holland Park?
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. Royal Borough of Kensington & Chelsea processes planning applications in approximately 8–13 weeks depending on backlog.
What hidden costs catch Holland Park homeowners out on extensions?
In W11 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 Holland Park extensions?
Yes — Holland Park is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 2.6km from Holland Park. We've delivered extensions across the W11 postcode and our subcontractor network covers Kensington & Chelsea. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Extension pricing for Holland Park’s neighbours.
Twenty minutes on site in Holland Park.
On us.
Nick Elias RIBA and Vladimir will visit your Holland Park 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 Holland Park extension using the same 2026 rate card we quote real clients with.
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