From £6,466
Dartford, DA2
Need to find an Extension Builder near you for all your extension buildering work?
A Tutton Building Services Limited provides a local, tru...
From £6,370
ForsBuild Construction Ltd is a trusted extension builder serving customers in DA2 and the surrounding area. Contact us to today to get a competiti...
From £6,642
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £6,074
callisto construction is an established extension buildering business in DA2. We come highly recommended and provide competitive quotes for your wo...
From £6,338
Need an Extension Builder in DA2? DP Construction has been helping local clients (10 mile radius) with their extension buildering jobs for many yea...
From £6,290
Ideal Loft Ladders South East (SE) Ltd is an established extension buildering business in DA2. We come highly recommended and provide competitive q...
From £6,570
ABAH Property Services Ltd is a trusted extension builder serving customers in DA2 and the surrounding area. Contact us to today to get a competiti...
From £6,578
AJW BUILDERS is a trusted extension builder serving customers in DA2 and the surrounding area. Contact us to today to get a competitive quote for e...
From £6,282
Trusted and professional extension builder in DA2. Experienced in all extension buildering work and keeping within budget and on quote. Reeve Renov...
From £6,666
Since 2010, we have provided clients with a wide range of specialist services. Reeve Renovations offers a bespoke service for all your residential ...

Concrete foundations range from the £6,074 (Callisto construction based in DA4) to £6,666 (Reeve Renovations based in BR8) in DA2.
Comparing extension builders estimates for laying concrete foundations gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Find out the exact cost of laying concrete foundations in DA2 by posting a job with HaMuch. We will send it to extension builders who can give you a detailed quote.
"Concrete foundation" - DARTFORD, job posted 04/03/2026
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 - £17,678

Two storey extension - £88,266

Build a timber frame extension - £26,178

Build a swimming pool - £81,178

Single storey extension - £58,552

Side return extension - £43,498

Install an RSJ - £2,378

Outbuilding - £10,178

Build a Mansard loft conversion - £52,178

Loft conversion - £35,415

Build a kitchen extension - £42,178

Hip to gable loft conversion - £42,178

Granny annexe - £87,178

Garden office - £10,178

Convert a Garage - £16,178

Garage - £18,678

Build a flat roof extension - £22,178

Build a dormer loft conversion - £42,178

Concrete foundations - £6,428

Convert a bungalow loft - £29,178

Convert a basement - £39,498