House extensions
Building a single or two-storey extension onto a house, from the foundations and shell to the point it opens into the existing rooms. Of the 265 house extension builders on Tradehand, 34 are in London, followed by 21 in Poole, 17 in Walton-on-Thames, 14 in Banstead and 14 in Colchester. The work is also called house extension, single storey extension, rear extension or side return.
273
Builders listed
62
Register-listed
5
Areas
What needs doing?
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Builders who do house extensions
Worth knowing
- Among the London boroughs, Hillingdon has 4, Bromley 3, and Bexley, Camden and Croydon 2 each.
- Published rates recorded in Manchester range from £27,000 to £57,500, in Croydon from £29,000 to £60,250, in Ealing from £30,000 to £85,000, in Hackney from £14,650 to £90,400 and in Birmingham from £26,350 to £80,000.
- The national medians of the prices firms publish for 3 variants of this work across 12 UK towns, researched August 2026, give a price band of £42,000 to £52,300.
- 208 of the 265 have their own website.
- Companies House shows 30 of the 265 as active companies, incorporated between 1993 and 2025, with a median year of 2014.
- 158 also offer loft conversion and renovation and refurbishment, 99 garage conversion, 47 bricklaying and 46 new home construction, alongside 92 other services.