From £17,724
Volton Building & Paving is a trusted extension builder serving customers in Stanmore and the surrounding area. Contact us to today to get a compet...
From £17,924
Stanmore, HA7
Experienced extension builder ready to quote for your work. O DAMIEAN BUILDING SERVICES is the best extension builder in Stanmore. No obligation fr...
From £17,948
Mobile App Experts is a trusted extension builder serving customers in Stanmore and the surrounding area. Contact us to today to get a competitive ...
From £18,084
Stanmore, HA7
Need to find an Extension Builder near you for all your extension buildering work?
Filip Burla Ltd provides a local, trusted extension buil...
From £17,588
Arch Lucid Ltd ? Architectural Services was established with over twenty years? experience. We take pride in providing clients with a professional,...
From £17,660
Stanmore, HA7
BR Building Services Limited is a trusted extension builder serving customers in Stanmore and the surrounding area. Contact us to today to get a co...
From £17,892
Our building services company Pascariu Building Construction has been providing quality building services since 2017, helping customers in North an...
From £17,500
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,932
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...
From £18,028
We are one of the top residential building companies in London. We have built up a solid reputation for being the top builders in Harrow and London...

Underpinning ranges from £17,500 (Eternal Design and Build Ltd based in HA8) to £18,084 (Filip Burla Ltd based in HA7), 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 Stanmore by posting a job with HaMuch and we will send it to extension builders in Stanmore.
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 - £17,828

Two storey extension - £88,492

Build a timber frame extension - £26,328

Build a swimming pool - £81,328

Single storey extension - £61,560

Side return extension - £45,190

Install an RSJ - £2,528

Outbuilding - £10,328

Build a Mansard loft conversion - £52,328

Loft conversion - £36,825

Build a kitchen extension - £42,328

Hip to gable loft conversion - £42,328

Granny annexe - £87,328

Garden office - £10,328

Convert a Garage - £16,328

Garage - £18,828

Build a flat roof extension - £22,328

Build a dormer loft conversion - £42,328

Concrete foundations - £6,578

Convert a bungalow loft - £29,328

Convert a basement - £41,190