From £17,460
Palmers Green, N13
Homeowners look no further if you want a qualified extension builder to work in your home. The00Company Ltd are tidy and neat, providing a quality ...
From £17,620
Acacia Gardens Ltd are here to help customers who need an Extension Builder in N13. We offer a competitive rate to complete all your extension buil...
From £17,500
Greater London, N13
Noel’s Design was established in 1997 by Aaron Noel, its roots is in the Caribbean (Grenada and the British Virgin islands), branched off to Lon...
From £17,908
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £18,004
London, N13
Our building services company CESV Ltd was established in 2020, but have been helping customers in North London and the surrounding areas for over ...
From £17,796
Trusted and professional extension builder in N13. Experienced in all extension buildering work and keeping within budget and on quote. Oaks Build ...
From £17,548
By Design London Ltd are here to help customers who need an Extension Builder in N13. We offer a competitive rate to complete all your extension bu...
From £17,484
We are an experienced team dedicated to designing property in a way that is both beautiful and practical. For most people buying a property is an e...
From £17,716
Hassco Building Ltd is an established extension buildering business in N13. We come highly recommended and provide competitive quotes for your work...
From £17,732
We specialise in high quality residential refurbishment and new build works. We are experienced in traditional, and design and build contracts that...

Underpinning ranges from £17,460 (The00Company Ltd based in N13) to £18,004 (CESV Ltd based in N13), 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 N13 by posting a job with HaMuch and we will send it to extension builders in N13.
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 - £17,677

Two storey extension - £88,265

Build a timber frame extension - £26,177

Build a swimming pool - £81,177

Single storey extension - £58,536

Side return extension - £43,489

Install an RSJ - £2,377

Outbuilding - £10,177

Build a Mansard loft conversion - £52,177

Loft conversion - £35,408

Build a kitchen extension - £42,177

Hip to gable loft conversion - £42,177

Granny annexe - £87,177

Garden office - £10,177

Convert a Garage - £16,177

Garage - £18,677

Build a flat roof extension - £22,177

Build a dormer loft conversion - £42,177

Concrete foundations - £6,427

Convert a bungalow loft - £29,177

Convert a basement - £39,489