From £17,716
Need to find an Extension Builder near you for all your extension buildering work?
A Tutton Building Services Limited provides a local, tru...
From £17,620
ForsBuild Construction Ltd is a trusted extension builder serving customers in DA9 and the surrounding area. Contact us to today to get a competiti...
From £17,364
HYDER CONSTRUCTION LTD is a trusted extension builder serving customers in DA9 and the surrounding area. Contact us to today to get a competitive q...

Underpinning ranges from £17,364 (HYDER CONSTRUCTION LTD based in DA11) to £17,716 (A Tutton Building Services Limited based in DA2), 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 DA9 by posting a job with HaMuch and we will send it to extension builders in DA9.
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 - £17,567

Two storey extension - £88,100

Build a timber frame extension - £26,067

Build a swimming pool - £81,067

Single storey extension - £56,333

Side return extension - £42,250

Install an RSJ - £2,267

Outbuilding - £10,067

Build a Mansard loft conversion - £52,067

Loft conversion - £34,375

Build a kitchen extension - £42,067

Hip to gable loft conversion - £42,067

Granny annexe - £87,067

Garden office - £10,067

Convert a Garage - £16,067

Garage - £18,567

Build a flat roof extension - £22,067

Build a dormer loft conversion - £42,067

Concrete foundations - £6,317

Convert a bungalow loft - £29,067

Convert a basement - £38,250