We design, plan and build house extensions across Chelsea and the wider Kensington and Chelsea borough — one team, one fixed price, one project manager from sketch to handover.
Chelsea is one of London's most architecturally controlled neighbourhoods — Georgian and Victorian townhouses, garden squares, mews and mansion blocks, with a high proportion of listed buildings and conservation areas. Work here is as much about consent and craftsmanship as construction, which suits our in-house design-and-build approach.
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.
Planning drawings, building-regulations and party-wall paperwork are prepared and submitted by our own team — including for conservation-area or listed properties where extra consent is needed. One point of contact owns both the approvals and the build, so nothing falls between an architect and a separate contractor.
No subcontractor juggling. From the first sketch through structural engineering to final snagging, your project moves through people who all sit in the same office and answer to the same project manager.
You pay in stages, only after each stage is signed off. Variations only happen when scope genuinely changes — and they go through written authorisation, never a verbal "while we are at it".
extensions We have completed a luxury apartment refurbishment in the heart of London, transforming the space into a stunning, high-end home with breathtaking views of the city.
extensions Side-return rear extension on a Victorian terrace, opening up the kitchen and dining space onto the garden.
extensions One of our recent Surrey project involved large double storey side and rear house extension, creating a spacious open plan kitchen, snug, and dining area with massive sliding and bifold door.
Yes — Chelsea (SW3) is well within our Kensington and Chelsea working area. We typically deliver several house extensions projects across this borough each year.
End-to-end (consultation → handover) usually 12–22 weeks. Build phase alone is shorter — most house extensions sites complete in 8–18 weeks depending on scope and finishes.
Typical range: From £2,500 / m². Our online calculator gives you a tighter figure based on your house type and ambitions; the fixed quote follows a free site visit.
It depends on the property. Many house extensions fall under permitted development, especially in Kensington and Chelsea. Where planning is needed (conservation areas, listed properties, larger schemes), we handle the application end-to-end.
Many extensions fall under permitted development. We assess your property and tell you exactly what you need on the first visit.
A single-storey extension takes 12–16 weeks from breaking ground to completion. Double-storey runs 16–22 weeks.
For most rear extensions, yes. We dust-seal the working area and maintain access to your kitchen and bathroom.
Free 2-minute calculator + a fixed-price quote within one working day after a site visit
