From £17,820
Cliden Construction (London) is a trusted extension builder serving customers in SW1V and the surrounding area. Contact us to today to get a compet...
From £17,756
F & F Building Services is an established extension buildering business in SW1V. We come highly recommended and provide competitive quotes for your...
From £17,836
Luxury Movement is an established extension buildering business in SW1V. We come highly recommended and provide competitive quotes for your work.
From £17,476
A to Z Builders Ltd are here to help customers who need an Extension Builder in SW1V. We offer a competitive rate to complete all your extension bu...
From £17,492
Relax... you have found a reliable extension builder in SW1V. London Projects Ltd is a friendly and reliable company based in SW1V who consider no ...
From £15,708
Here at London Design and Build, our team of architects, interior designers, structural engineers and contractors, offer a bespoke, turn-key servic...
From £17,524
At Alt Construction we provide a complete and professional turnkey construction service for internal alterations, extensions, including detailed de...
From £17,892
Trusted and professional extension builder in SW1V. Experienced in all extension buildering work and keeping within budget and on quote. Property R...
From £17,396
Trusted and professional extension builder in SW1V. Experienced in all extension buildering work and keeping within budget and on quote. Sloane Ave...
From £17,908
Our building services company Autas Developments have fifteen years' experience of helping customers in Central London and the surrounding areas by...

Underpinning ranges from £15,708 (London Design And Build based in SW1A) to £17,908 (Autas Developments based in SW1W), 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 SW1V by posting a job with HaMuch and we will send it to extension builders in SW1V.
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 - £17,481

Two storey extension - £87,971

Build a timber frame extension - £25,981

Build a swimming pool - £80,981

Single storey extension - £54,616

Side return extension - £41,284

Install an RSJ - £2,181

Outbuilding - £9,981

Build a Mansard loft conversion - £51,981

Loft conversion - £33,570

Build a kitchen extension - £41,981

Hip to gable loft conversion - £41,981

Granny annexe - £86,981

Garden office - £9,981

Convert a Garage - £15,981

Garage - £18,481

Build a flat roof extension - £21,981

Build a dormer loft conversion - £41,981

Concrete foundations - £6,231

Convert a bungalow loft - £28,981

Convert a basement - £37,284