From £17,876
Greater London, SW19
Firman Reece Ltd is an established and experienced local extension builder in SW19. Please contact us for a free, no obligation quote and competiti...
From £17,620
Relax... you have found a reliable extension builder in SW19. Design Manage Build is a friendly and reliable company based in SW19 who consider no ...
From £17,772
London, SW19
DesignBox Architecture Ltd is a chartered architectural design practice based in South West London. We can offer a full range of architectural serv...
From £17,916
Silverain Limited is an established extension buildering business in SW19. We come highly recommended and provide competitive quotes for your work....
From £17,668
Wimbledon, SW19
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,820
Experienced extension builder ready to quote for your work. London Dream Building is the best extension builder in SW19. No obligation free quotes ...
From £17,540
Greater London, SW19
London Dream Building is a London based building and home improvement company, specialising in new build, full house refurbishments, extensions as ...
From £17,436
Trusted and professional extension builder in SW19. Experienced in all extension buildering work and keeping within budget and on quote. Westgate &...
From £17,916
Wimbledon, SW19
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,772
HJPM is an established and experienced local extension builder in SW19. Please contact us for a free, no obligation quote and competitive rates. Co...

Underpinning ranges from £17,436 (Westgate & Keele based in SW19) to £17,916 (Silverain Limited based in SW19), 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 SW19 by posting a job with HaMuch and we will send it to extension builders in SW19.
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 - £17,734

Two storey extension - £88,350

Build a timber frame extension - £26,234

Build a swimming pool - £81,234

Single storey extension - £59,672

Side return extension - £44,128

Install an RSJ - £2,434

Outbuilding - £10,234

Build a Mansard loft conversion - £52,234

Loft conversion - £35,940

Build a kitchen extension - £42,234

Hip to gable loft conversion - £42,234

Granny annexe - £87,234

Garden office - £10,234

Convert a Garage - £16,234

Garage - £18,734

Build a flat roof extension - £22,234

Build a dormer loft conversion - £42,234

Concrete foundations - £6,484

Convert a bungalow loft - £29,234

Convert a basement - £40,128