Dartford, DA1
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,508
Dartford, DA1
OAK BUILDERS is a trusted extension builder serving customers in DA1 and the surrounding area. Contact us to today to get a competitive quote for e...
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 £17,828
Dartford, DA1
AJW BUILDERS is a trusted extension builder serving customers in DA1 and the surrounding area. Contact us to today to get a competitive quote for e...
From £17,820
ABAH Property Services Ltd is a trusted extension builder serving customers in DA1 and the surrounding area. Contact us to today to get a competiti...
From £17,540
Dartford, DA1
Ideal Loft Ladders South East (SE) Ltd is an established extension buildering business in DA1. We come highly recommended and provide competitive q...
From £17,620
ForsBuild Construction Ltd is a trusted extension builder serving customers in DA1 and the surrounding area. Contact us to today to get a competiti...

Underpinning ranges from £17,508 (OAK BUILDERS based in DA1) to £17,892 (Amberly Builders based in DA1), 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 DA1 by posting a job with HaMuch and we will send it to extension builders in DA1.
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 - £17,699

Two storey extension - £88,299

Build a timber frame extension - £26,199

Build a swimming pool - £81,199

Single storey extension - £58,980

Side return extension - £43,739

Install an RSJ - £2,399

Outbuilding - £10,199

Build a Mansard loft conversion - £52,199

Loft conversion - £35,616

Build a kitchen extension - £42,199

Hip to gable loft conversion - £42,199

Granny annexe - £87,199

Garden office - £10,199

Convert a Garage - £16,199

Garage - £18,699

Build a flat roof extension - £22,199

Build a dormer loft conversion - £42,199

Concrete foundations - £6,449

Convert a bungalow loft - £29,199

Convert a basement - £39,739