Experienced extension builder ready to quote for your work. Proxile Solutions Limited is the best extension builder in TW17. No obligation free quo...
Experienced extension builder ready to quote for your work. J H CONSTRUCTION is the best extension builder in TW17. No obligation free quotes and m...
Experienced extension builder ready to quote for your work. AMD Building Services is the best extension builder in TW17. No obligation free quotes ...
From £17,836
We are a Design and Build company with more than 20 years experience. We can help you with your extension, loft conversion, refurbishment, basement...
From £17,628
TATEBERRY DESIGN&CONSTRUCTION is an established extension buildering business in TW17. We come highly recommended and provide competitive quotes fo...
From £17,772
At Method Build we take the stress out of home renovations. With transparent pricing, a systematic approach and regular progress updates, we ensure...
From £17,796
Offa Construction Ltd is an established extension buildering business in TW17. We come highly recommended and provide competitive quotes for your w...
From £17,812
Experienced extension builder ready to quote for your work. Aspire Design & Build Ltd is the best extension builder in TW17. No obligation free quo...
From £17,916
Need to find an Extension Builder near you for all your extension buildering work?
TOTUS provides a local, trusted extension buildering ser...
From £17,828
Experienced extension builder ready to quote for your work. GJ Design and Build Ltd is the best extension builder in TW17. No obligation free quote...

Underpinning ranges from £17,436 (J H CONSTRUCTION based in TW16) to £17,916 (TOTUS based in kt12), 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 TW17 by posting a job with HaMuch and we will send it to extension builders in TW17.
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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200