From £6,346
Need to find an Extension Builder near you for all your extension buildering work?
Pillar Contractors Ltd provides a local, trusted extensi...
From £6,722
We are a Design and Build Company, based in London.We focus on super prime and luxury residential renovations in and around London and internationa...
From £6,290
We Love Build - Three Arches is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quotes ...
From £6,274
Luxe Refurbs is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quotes for your work.
From £6,338
Dominic Payte - Design & Build is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quote...
From £6,650
Starfish Properties is a trusted extension builder serving customers in Mayfair and the surrounding area. Contact us to today to get a competitive ...
From £6,354
Trusted and professional extension builder in Mayfair. Experienced in all extension buildering work and keeping within budget and on quote. The May...
From £6,602
Experienced extension builder ready to quote for your work. Mayfair Design is the best extension builder in Mayfair. No obligation free quotes and ...
From £6,330
Experienced extension builder ready to quote for your work. Azur London is the best extension builder in Mayfair. No obligation free quotes and man...
From £6,634
Experienced extension builder ready to quote for your work. Future Homes Design and Build is the best extension builder in Mayfair. No obligation f...

Concrete foundations range from the £6,274 (Luxe Refurbs based in W1J) to £6,722 (We Love Build based in W1J) in Mayfair.
Comparing extension builders estimates for laying concrete foundations gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Find out the exact cost of laying concrete foundations in Mayfair by posting a job with HaMuch. We will send it to extension builders who can give you a detailed quote.
"Concrete foundation" - W1T, job posted 01/01/70
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 - £17,704

Two storey extension - £88,306

Build a timber frame extension - £26,204

Build a swimming pool - £81,204

Single storey extension - £59,080

Side return extension - £43,795

Install an RSJ - £2,404

Outbuilding - £10,204

Build a Mansard loft conversion - £52,204

Loft conversion - £35,663

Build a kitchen extension - £42,204

Hip to gable loft conversion - £42,204

Granny annexe - £87,204

Garden office - £10,204

Convert a Garage - £16,204

Garage - £18,704

Build a flat roof extension - £22,204

Build a dormer loft conversion - £42,204

Concrete foundations - £6,454

Convert a bungalow loft - £29,204

Convert a basement - £39,795