House extension cost
in Earls Court.

Typical 2026 Earls Court ranges (inc. design, planning, build, contingency & VAT): side-return extensions £104k–£184k; single-storey rear £127k–£242k; wraparound £196k–£368k; double-storey rear £207k–£437k; basement £288k–£863k. The Earls Court multiplier (1.15×) reflects local labour rates, scaffold logistics and finish expectations.

Earls Court Conservation Area covers the whole grid. Expect full planning, with conservation officer scrutiny on roofline visibility from the street. 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.

Tall Italianate stucco terraces, mostly converted to flats; remaining single-family homes are large four- and five-storey townhouses. 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.

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.

In SW5 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.

Yes — Earls Court is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 1.6km from Earls Court. We've delivered extensions across the SW5 postcode and our subcontractor network covers Kensington & Chelsea. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.