Loft conversion cost
in West Brompton.

The Earls Court and Brompton Cemetery conservation areas overlap parts of SW10; expect full planning on most loft applications. Outside conservation areas, most rear-dormer conversions in West Brompton qualify for permitted development (PD) within the 40m³ (terrace) or 50m³ (semi/detached) volume limits. Mansards always need full planning. We check your specific address before quoting and submit the application on your behalf.

On Victorian four-storey terraces — yes, often. A mansard wraps the entire rear roof and gains 30–40% more floor area than a dormer alone, and on RBKC's planning preferences a well-detailed mansard often clears planning faster than a contested dormer. The premium is typically £40–£60k.

Typical timeline: 6–10 weeks for design and planning (longer in conservation areas like much of West Brompton), then 8–14 weeks on site for a standard dormer, 12–18 weeks for an L-shape or hip-to-gable, and 14–20 weeks for a mansard. Royal Borough of Kensington & Chelsea processes PD-route Lawful Development Certificates in approximately 8 weeks.

In SW10, a well-executed loft conversion typically adds 15–25% to property value — often more in prime postcodes. The ROI is strongest when you add a double bedroom plus en-suite, which is the standard L-shape dormer configuration. Property uplift on a £50k–£246k build commonly exceeds the build cost by 30–60%.

Yes — West Brompton is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 1.4km from West Brompton. We've delivered loft conversions across the SW10 postcode and our subcontractor network covers Kensington & Chelsea. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.