From £17,900
Our building services company May & Sons Building Solutions Limited is a family-run business established in 2019. Since then we have been helping c...
From £17,508
Kent, BR7
Experienced extension builder ready to quote for your work. OBC Building and Construction is the best extension builder in Chislehurst. No obligati...
From £17,540
R&K EVANS BUILDERS is an established extension buildering business in Chislehurst. We come highly recommended and provide competitive quotes for yo...
From £17,892
Greater London, BR7
Need an Extension Builder in Chislehurst? Synsera Homes has been helping local clients (10 mile radius) with their extension buildering jobs for ma...
From £17,516
Need to find an Extension Builder near you for all your extension buildering work?
Belmont Building Company Ltd provides a local, trusted e...
From £17,828
Chislehurst, BR7
Trusted and professional extension builder in Chislehurst. Experienced in all extension buildering work and keeping within budget and on quote. BEL...
From £17,612
Need to find an Extension Builder near you for all your extension buildering work?
Master Builders provides a local, trusted extension buil...
From £17,588
Chislehurst Kent, BR7
Our building services company SE One Builders Ltd was established in 1992. Since then, we have been helping customers in Chislehurst and the surrou...
From £17,716
Experienced extension builder ready to quote for your work. Aumosa Ltd is the best extension builder in Chislehurst. No obligation free quotes and ...
From £17,388
Need an Extension Builder in Chislehurst? P&A - Design and Build has been helping local clients (10 mile radius) with their extension buildering jo...

Underpinning ranges from £17,388 (P&A - Design and Build based in BR5) to £17,900 (May & Sons Building Solutions Limited based in BR7), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Chislehurst by posting a job with HaMuch and we will send it to extension builders in Chislehurst.
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 - £17,649

Two storey extension - £88,223

Build a timber frame extension - £26,149

Build a swimming pool - £81,149

Single storey extension - £57,976

Side return extension - £43,174

Install an RSJ - £2,349

Outbuilding - £10,149

Build a Mansard loft conversion - £52,149

Loft conversion - £35,145

Build a kitchen extension - £42,149

Hip to gable loft conversion - £42,149

Granny annexe - £87,149

Garden office - £10,149

Convert a Garage - £16,149

Garage - £18,649

Build a flat roof extension - £22,149

Build a dormer loft conversion - £42,149

Concrete foundations - £6,399

Convert a bungalow loft - £29,149

Convert a basement - £39,174