House extensions & lofts in Chelsea
Chelsea's Georgian and Victorian townhouses demand conservation-grade work — our completed luxury apartment refurbishment in Chelsea shows the finish level we hold. Extensions, remodels and full refurbishments by one in-house team, at a fixed itemised price.
- Postcode SW3
- Borough Kensington and Chelsea
- Projects 1
- Free quote 2 min online
What we deliver in Chelsea
Every street sits differently — a period terrace, a post-war semi, a modern infill. We shape the recommendation around your actual house, its planning context and how you want to live.
Rear and lower-ground extensions are the most common way to add space in Chelsea, where footprints are tight and street frontages are protected. We handle the listed-building or conservation consent alongside the build.
Mansard and rear-dormer loft conversions add a floor without altering a protected street elevation — designed to sit correctly within the roofline and the planning constraints typical of the area.
Full new-builds are rare in Chelsea and usually mean sensitive infill or a rebuild behind a retained façade. We manage the design, consents and construction as one project.
SERVICE 01 House extensions in Chelsea
Single-storey, double-storey, side-return and wrap-around extensions — designed, planned and built by one in-house team.
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SERVICE 02 Loft conversions in Chelsea
Dormer, mansard, hip-to-gable and L-shape lofts — full-height ceilings, proper staircases, en-suites.
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SERVICE 03 New builds in Chelsea
Ground-up homes on infill plots, demolition-and-rebuild, and small multi-unit schemes.
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Common Chelsea questions
Things you might need to know about building in Chelsea.
Do I need planning permission for an extension in Chelsea?
Many extensions in Chelsea fall under permitted development. Where a full application is needed, it goes to Kensington & Chelsea Council — we assess your property type, the council's restrictions and any conservation status on the first visit, and handle the application ourselves.
How long does a project in Chelsea typically take?
From first consultation to handover: 6–9 months for a single-storey extension or loft, 9–14 months for double-storey or wrap-around. We give you a tighter estimate after the survey.
Are there conservation areas in Chelsea?
Several streets in Kensington & Chelsea Council's area fall within conservation areas that restrict materials and detailing. We check your exact address against the register on the first visit, and we have approved schemes in conservation areas nearby.
What is a typical extension cost in Chelsea?
Build cost in this part of London runs £2,500–£4,000 per square metre for a finished extension including kitchen and finishes. Our calculator gives a personalised estimate.
Ready to start your Chelsea project?
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