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Select your affordable KT23 extension builder
From £6,586
Leatherhead, KT23
Hallmark Construction and Development Ltd are here to help customers who need an Extension Builder in KT23. We offer a competitive rate to complete...
From £6,378
Need an Extension Builder in KT23? Albany Roofing & Guttering has been helping local clients (10 mile radius) with their extension buildering jobs ...
From £6,650
Thomas Jensen
Please visit our web site at for full detailed photos of previous projects and clients testimonials.
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From £6,618
Trusted and professional extension builder in KT23. Experienced in all extension buildering work and keeping within budget and on quote. St Peter T...

Concrete foundations range from the £6,378 (Albany Roofing & Guttering based in KT22) to £6,650 (TH Jensen based in KT22) in KT23.
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 KT23 by posting a job with HaMuch. We will send it to extension builders who can give you a detailed quote.
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 - £17,808

Two storey extension - £88,462

Build a timber frame extension - £26,308

Build a swimming pool - £81,308

Single storey extension - £61,160

Side return extension - £44,965

Install an RSJ - £2,508

Outbuilding - £10,308

Build a Mansard loft conversion - £52,308

Loft conversion - £36,638

Build a kitchen extension - £42,308

Hip to gable loft conversion - £42,308

Granny annexe - £87,308

Garden office - £10,308

Convert a Garage - £16,308

Garage - £18,808

Build a flat roof extension - £22,308

Build a dormer loft conversion - £42,308

Concrete foundations - £6,558

Convert a bungalow loft - £29,308

Convert a basement - £40,965