From £6,650
Buckinghamshire, W3
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £6,554
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £6,754
London, W3
At Ferdas Design & Build Ltd we have been fitting bespoke bathrooms since 2013. We pride ourselves on being the go-to bathroom fitters for discerni...
From £6,274
Need to find an Extension Builder near you for all your extension buildering work?
Nomex Design provides a local, trusted extension builder...
From £6,482
London, W3
Our building services company Fox Construct Ltd is a family-run business based in West London with a solid team of professionals dedicated to compl...
From £6,250
Relax... you have found a reliable extension builder in W3. Raremade is a friendly and reliable company based in W3 who consider no job as too big ...
From £6,458
Greater London, W3
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £6,442
PJS Building & Maintenance Ltd is a trusted extension builder serving customers in W3 and the surrounding area. Contact us to today to get a compet...
From £6,282
Acton, W3
LINE BUILDERS LTD is an established extension buildering business in W3. We come highly recommended and provide competitive quotes for your work.
From £6,466
R Burton & Sons Builders are here to help customers who need an Extension Builder in W3. We offer a competitive rate to complete all your extension...

Concrete foundations range from the £6,250 (Raremade based in W3) to £6,754 (Ferdas Design & Build Ltd based in W3) in W3.
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 W3 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 - £17,711

Two storey extension - £88,317

Build a timber frame extension - £26,211

Build a swimming pool - £81,211

Single storey extension - £59,224

Side return extension - £43,876

Install an RSJ - £2,411

Outbuilding - £10,211

Build a Mansard loft conversion - £52,211

Loft conversion - £35,730

Build a kitchen extension - £42,211

Hip to gable loft conversion - £42,211

Granny annexe - £87,211

Garden office - £10,211

Convert a Garage - £16,211

Garage - £18,711

Build a flat roof extension - £22,211

Build a dormer loft conversion - £42,211

Concrete foundations - £6,461

Convert a bungalow loft - £29,211

Convert a basement - £39,876