From £17,708
Need to find an Extension Builder near you for all your extension buildering work?
Albion Roofing Solutions provides a local, trusted exten...
From £17,484
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,572
Trusted and professional extension builder in SE26. Experienced in all extension buildering work and keeping within budget and on quote. NKD Contra...
From £17,812
Pure Building & Maintenance is a family run business with over 35 years' experience. Comprising a team of dedicated professionals who all have the...
From £17,404
Need to find an Extension Builder near you for all your extension buildering work?
STOYANOV CONSTRUCTION LTD provides a local, trusted exte...
From £17,748
Baseline Build and Renovate Ltd is an established extension buildering business in SE26. We come highly recommended and provide competitive quotes ...
From £17,452
Our building services company Ruspi Ltd has many years of experience.We have been helping customers in London and the surrounding area by p...
From £17,540
Need to find an Extension Builder near you for all your extension buildering work?
Smartroofingbuildingcontractorsltd provides a local, tru...
From £17,924
Experienced extension builder ready to quote for your work. Claudiu Mihaila is the best extension builder in SE26. No obligation free quotes and ma...
From £17,932
We are a family run local business that was founded in 2007. Universal Plastering Ltd provides a wide variety of building and plastering services i...

Underpinning ranges from £17,404 (STOYANOV CONSTRUCTION LTD based in SE23) to £17,932 (Universal Plastering Ltd based in SE19), 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 SE26 by posting a job with HaMuch and we will send it to extension builders in SE26.
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 - £17,658

Two storey extension - £88,236

Build a timber frame extension - £26,158

Build a swimming pool - £81,158

Single storey extension - £58,152

Side return extension - £43,273

Install an RSJ - £2,358

Outbuilding - £10,158

Build a Mansard loft conversion - £52,158

Loft conversion - £35,228

Build a kitchen extension - £42,158

Hip to gable loft conversion - £42,158

Granny annexe - £87,158

Garden office - £10,158

Convert a Garage - £16,158

Garage - £18,658

Build a flat roof extension - £22,158

Build a dormer loft conversion - £42,158

Concrete foundations - £6,408

Convert a bungalow loft - £29,158

Convert a basement - £39,273