From £17,436
Need to find an Extension Builder near you for all your extension buildering work?
Barnes Design provides a local, trusted extension builde...
From £17,988
Tooting Greater London, SW17
We are an architectural & interior design consultancy. We're a little bit mad...but isn't there a fine line between sanity and genius?!!Barnes Desi...
From £17,524
Cristian Neacsu has over twenty years of experience in the home renovation & design industry specialising residential projects of all sizes and bud...
From £17,804
London, SW17
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,364
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,604
Tooting, SW17
Langston Builders is a trusted extension builder serving customers in Tooting and the surrounding area. Contact us to today to get a competitive qu...
From £17,444
Hughes Developments is a trusted extension builder serving customers in Tooting and the surrounding area. Contact us to today to get a competitive ...
From £17,588
Tooting, SW17
Trusted and professional extension builder in Tooting. Experienced in all extension buildering work and keeping within budget and on quote. TOUCH W...
From £17,372
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,852
Tooting Greater London, SW17
Global Building Contractor Ltd are a building and renovations company based in South West London. Our team of professional builders, provide compl...

Underpinning ranges from £17,364 (Apartment Renovation Limited based in sw17) to £17,988 (Barnes Design based in SW17), 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 Tooting by posting a job with HaMuch and we will send it to extension builders in Tooting.
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 - £17,598

Two storey extension - £88,146

Build a timber frame extension - £26,098

Build a swimming pool - £81,098

Single storey extension - £56,952

Side return extension - £42,598

Install an RSJ - £2,298

Outbuilding - £10,098

Build a Mansard loft conversion - £52,098

Loft conversion - £34,665

Build a kitchen extension - £42,098

Hip to gable loft conversion - £42,098

Granny annexe - £87,098

Garden office - £10,098

Convert a Garage - £16,098

Garage - £18,598

Build a flat roof extension - £22,098

Build a dormer loft conversion - £42,098

Concrete foundations - £6,348

Convert a bungalow loft - £29,098

Convert a basement - £38,598