Build Team Blog

Bonham Road is a 52 sqm ground floor rear extension on a Victorian terrace in Brixton, SW2. It took 16 weeks to build and cost £109,000 plus VAT. The brief was to replace a dark, cut-off rear with one open-plan kitchen, dining and living space that opens onto the garden. Below i...

A fully insulated garden office in London costs roughly £16,000 to £35,000+ in 2026, at about £1,500 to £2,500 per m², including the base, insulation, glazing, certified electrics and installation. A small basic office starts from around £8,000, and a large made-to-measure one can pass £45,000. Most garden offices do not need planning permis...

A single-storey rear extension in London costs roughly £80,000 to £150,000 all-in in 2026, at about £2,800 to £5,500 per square metre, including the build, glazing, fees and 20% VAT. A wraparound, which adds the side return alongside the rear, is the largest single-storey footprint and costs £90,000 to £170,000+, a premium o...

A loft conversion in London costs roughly £25,000 to £100,000+ all-in in 2026, set mainly by type: a Velux conversion is cheapest at about £25,000 to £45,000, a rear dormer runs £45,000 to £75,000, and a mansard is the dearest at £60,000 to £100,000+. Per square metre that is about £2,000 to £2,800 for simpler lofts and £3,500 to £4,...

A kitchen extension in London costs roughly £80,000 to £150,000 all-in in 2026 for a typical 20 to 30 m² rear extension, at about £2,800 to £5,500 per m², including the build, the new kitchen, glazing, fees and 20% VAT. The kitchen itself usually accounts for about a quarter to a third of the total budget, from £15,000 for a...