From £17,852
Chessington, KT9
Need an Extension Builder in KT9? FLUID CONSTRUCTION has been helping local clients (10 mile radius) with their extension buildering jobs for many ...
From £17,292
West Ewell flooring: covering all aspects of flooring supply and fitting service. please contact us for inquiries
From £17,540
Greater London, KT9
Need to find an Extension Builder near you for all your extension buildering work?
RMC Design & Build Ltd. provides a local, trusted extens...
From £17,772
Need to find an Extension Builder near you for all your extension buildering work?
OAK HOUSE BESPOKE BUILDERS provides a local, trusted ext...
From £17,908
Surrey, KT9
mardon is an established and experienced local extension builder in KT9. Please contact us for a free, no obligation quote and competitive rates. C...
From £17,500
All of our work is guaranteed and covered by public liability and third party insurance for £5 million, giving our customers absolute peace of min...
From £17,852
We are a London based Design & Build construction company offering the following :Property Extensions and Major RenovationsBespoke Kitchens - Desig...
From £17,596
Experienced extension builder ready to quote for your work. Martini Building Contractors is the best extension builder in KT9. No obligation free q...
From £17,892
solaes construction is an established extension buildering business in KT9. We come highly recommended and provide competitive quotes for your work...
From £17,636
Trusted and professional extension builder in KT9. Experienced in all extension buildering work and keeping within budget and on quote. Active Fox ...

Underpinning ranges from £17,292 (West Ewell flooring based in Kt9) to £17,908 (Mardon based in kt9), 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 KT9 by posting a job with HaMuch and we will send it to extension builders in KT9.
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 - £17,684

Two storey extension - £88,276

Build a timber frame extension - £26,184

Build a swimming pool - £81,184

Single storey extension - £58,680

Side return extension - £43,570

Install an RSJ - £2,384

Outbuilding - £10,184

Build a Mansard loft conversion - £52,184

Loft conversion - £35,475

Build a kitchen extension - £42,184

Hip to gable loft conversion - £42,184

Granny annexe - £87,184

Garden office - £10,184

Convert a Garage - £16,184

Garage - £18,684

Build a flat roof extension - £22,184

Build a dormer loft conversion - £42,184

Concrete foundations - £6,434

Convert a bungalow loft - £29,184

Convert a basement - £39,570