From £16,128
Experienced extension builder ready to quote for your work. Top Builders is the best extension builder in Thornton Heath. No obligation free quotes...
From £16,264
Peng Construction & Property Maintenance is an established extension buildering business in Thornton Heath. We come highly recommended and provide ...
From £17,200
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
From £16,216
Building Plus Company London Ltd is an established extension buildering business in Thornton Heath. We come highly recommended and provide competit...
From £16,240
Need to find an Extension Builder near you for all your extension buildering work?
VDL Construction Ltd provides a local, trusted extension...
From £15,968
Experienced extension builder ready to quote for your work. Croft Structural Engineers is the best extension builder in Thornton Heath. No obligati...
From £16,216
Experienced extension builder ready to quote for your work. Atkins Builders is the best extension builder in Thornton Heath. No obligation free quo...
From £16,520
Need an Extension Builder in Thornton Heath? Fredibuilder has been helping local clients (10 mile radius) with their extension buildering jobs for...
From £15,952
Experienced extension builder ready to quote for your work. A & P Master Construction is the best extension builder in Thornton Heath. No obligatio...

Garage conversions in Thornton Heath typically range from £15,576 (M & J Building Construction based in CR7) to £17,200 (Banga Decoration based in CR7), but the only way to get an accurate cost for your specific project is to get quotes.
Post a job with HaMuch and we'll send it to extension builders in Thornton Heath who will be happy to help.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,728

Two storey extension - £88,342

Build a timber frame extension - £26,228

Build a swimming pool - £81,228

Single storey extension - £59,560

Side return extension - £44,065

Install an RSJ - £2,428

Outbuilding - £10,228

Build a Mansard loft conversion - £52,228

Loft conversion - £35,888

Build a kitchen extension - £42,228

Hip to gable loft conversion - £42,228

Granny annexe - £87,228

Garden office - £10,228

Convert a Garage - £16,228

Garage - £18,728

Build a flat roof extension - £22,228

Build a dormer loft conversion - £42,228

Concrete foundations - £6,478

Convert a bungalow loft - £29,228

Convert a basement - £40,065