Home Extension Builders in Clapham

Home extension cost in Clapham typically ranges from £50,000 to £120,000+. A single-storey rear extension (3m x 4m) costs £50,000–£70,000, larger single-storey extensions run £70,000–£90,000, side returns £40,000–£58,000, and double-storey extensions £90,000–£120,000+. Costs vary based on groundworks, finishes, and conservation requirements. Buildaway provides full itemised home extension cost Clapham breakdowns before work starts.

Home extension cost in Clapham runs 25–30% above the UK national average due to South West London labour rates and premium material costs across SW4 and SW11. A single-storey rear extension averaging £35,000–£50,000 nationally sits at £50,000–£70,000 in Clapham. Buildaway offers transparent, no-hidden-fee estimates throughout.

Most home extensions in Clapham complete within 12 to 20 weeks. Single-storey rear extensions take 12–14 weeks, side returns 10–12 weeks, and double-storey extensions 16–20 weeks. Conservation area consents and party wall agreements are common in Clapham and may add further lead time. Buildaway sets clear programme dates from the outset and keeps you informed at every stage.

Buildaway offers single-storey rear extensions, side return extensions, double-storey additions, wrap-around extensions, and garage conversions across Clapham. Our home extension specialists assess your property's footprint, boundaries, and local planning constraints before recommending the best approach and creating tailored home extension plans in Clapham.

We begin with a free site survey covering structure, boundaries, drainage, and any planning or conservation requirements specific to Clapham. We talk through your home extension ideas and work through costs for your property type. Buildaway manages all architectural drawings, structural calculations, and submissions to Lambeth Council — through to Building Control completion certificates.

Yes — our in-house team of architects, structural engineers, and tradespeople handles everything: planning applications, party wall agreements, conservation consents, Building Control submissions, and all construction trades. As a fully integrated home extension company in Clapham, you have one point of contact from first consultation to final handover.