From £6,738
Barnard Interiors is an established and experienced local extension builder in Balham. Please contact us for a free, no obligation quote and compet...
From £6,354
Greater London, SW12
IDL Contractors Ltd are here to help customers who need an Extension Builder in Balham. We offer a competitive rate to complete all your extension ...
From £6,506
M. Watkins and Sons Ltd is an established and experienced local extension builder in Balham. Please contact us for a free, no obligation quote and ...
From £6,266
Balham, SW12
R C BUILDER is a trusted extension builder serving customers in Balham and the surrounding area. Contact us to today to get a competitive quote for...
From £6,354
Relax... you have found a reliable extension builder in Balham. Zenico is a friendly and reliable company based in Balham who consider no job as to...
From £6,290
Balham Surrey, SW12
Interior Space Solutions Ltd (Trading as Loft Concept ) are a trustworthy and reliable company that undertake Loft Conversion and Kitchen Extension...
From £6,450
Our building services company Basenet Ltd have sixteen years experience and have been helping customers in London and the surrounding area by provi...
From £6,194
Hughes Developments is a trusted extension builder serving customers in Balham and the surrounding area. Contact us to today to get a competitive q...
From £6,650
Need to find an Extension Builder near you for all your extension buildering work?
William Coles provides a local, trusted extension builde...
From £6,330
Renoview staff has over 24 years of experience can make your renovation process smoother and stress free for you. Our main focus is on renovation a...

Concrete foundations range from the £6,194 (Hughes Developments based in SW17) to £6,738 (Barnard Interiors based in SW12) in Balham.
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 Balham 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 - £17,663

Two storey extension - £88,245

Build a timber frame extension - £26,163

Build a swimming pool - £81,163

Single storey extension - £58,264

Side return extension - £43,336

Install an RSJ - £2,363

Outbuilding - £10,163

Build a Mansard loft conversion - £52,163

Loft conversion - £35,280

Build a kitchen extension - £42,163

Hip to gable loft conversion - £42,163

Granny annexe - £87,163

Garden office - £10,163

Convert a Garage - £16,163

Garage - £18,663

Build a flat roof extension - £22,163

Build a dormer loft conversion - £42,163

Concrete foundations - £6,413

Convert a bungalow loft - £29,163

Convert a basement - £39,336