From £17,860
MCCM BUILDING SERVICES LTD is an established and experienced local extension builder in Hillingdon. Please contact us for a free, no obligation quo...
From £17,708
Hillingdon Middlesex, UB10
GS Design & Developments Ltd is a well established, trustworthy, reliable and professional company covering the whole of West London, North London,...
From £17,532
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,860
Hillingdon Middlesex, UB10
Welcome to Homeworks Roofing Services, we work on roof tops of private homes and listed buildings across Middlesex, West London and Ruislip.
From £17,564
Sokhi Construction (UK) Ltd is a trusted extension builder serving customers in Hillingdon and the surrounding area. Contact us to today to get a c...
From £17,428
G S Builders are here to help customers who need an Extension Builder in Hillingdon. We offer a competitive rate to complete all your extension bui...
From £17,572
At CC Builders UK Development, we offer solutions for all aspects of construction for both domestic and commercial clients throughout London and th...
From £17,940
We specialize in residential and commercial developments , delivering a highly personalized and professional customer focused service.We have skil...
From £17,932
GMB BUILDING SERVICES is an established and experienced local extension builder in Hillingdon. Please contact us for a free, no obligation quote an...
From £17,380
Go Building ( London ) Ltd is a trusted extension builder serving customers in Hillingdon and the surrounding area. Contact us to today to get a co...

Underpinning ranges from £17,380 (Go Building ( London ) Ltd based in UB4) to £17,940 (PB Viking Construction Ltd based in UB8), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Hillingdon by posting a job with HaMuch and we will send it to extension builders in Hillingdon.
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