From £37,230
Greater London, UB6
Relax... you have found a reliable extension builder in UB6. LSD Design and Build Ltd is a friendly and reliable company based in UB6 who consider ...
From £40,380
A leading design and construction company, creating homes for clients who expect total attention to quality and detail. Our family business strives...
From £40,920
Greenford, UB6
Need to find an Extension Builder near you for all your extension buildering work?
Avon Ruby (UK) Limited provides a local, trusted extensi...
From £38,220
We focus mainly on major reconstructions of basements, lofts, extensions as well as new-build. We work with architects, construction site inspector...
From £41,910
Greater London, UB6
Insider Property is an established and experienced local extension builder in UB6. Please contact us for a free, no obligation quote and competitiv...
From £38,220
Experienced extension builder ready to quote for your work. GBG Building Services Ltd is the best extension builder in UB6. No obligation free quot...
From £42,990
Greater London, UB6
Established in 2005, we are London's main contractor with significant experience in prime property construction and refurbishment, delivering proje...
From £40,110
Caro Construction Ltd is an established and experienced local extension builder in UB6. Please contact us for a free, no obligation quote and compe...
From £42,360
perivale, UB6
With a wealth of experience, Mayfair Design & Build Limited can turn your dreams into reality. We are a family run organisation that specialises i...
From £38,040
EXTEND.HOUSE is a trusted extension builder serving customers in UB6 and the surrounding area. Contact us to today to get a competitive quote for e...

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost to convert a basement in UB6 by posting a job with HaMuch and we will send it to extension builders in UB6.
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 - £17,726

Two storey extension - £88,338

Build a timber frame extension - £26,226

Build a swimming pool - £81,226

Single storey extension - £59,512

Side return extension - £44,038

Install an RSJ - £2,426

Outbuilding - £10,226

Build a Mansard loft conversion - £52,226

Loft conversion - £35,865

Build a kitchen extension - £42,226

Hip to gable loft conversion - £42,226

Granny annexe - £87,226

Garden office - £10,226

Convert a Garage - £16,226

Garage - £18,726

Build a flat roof extension - £22,226

Build a dormer loft conversion - £42,226

Concrete foundations - £6,476

Convert a bungalow loft - £29,226

Convert a basement - £40,038