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 £17,924
Experienced extension builder ready to quote for your work. Claudiu Mihaila is the best extension builder in Forest Hill. No obligation free quotes...
From £17,580
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 Forest Hill. Experienced in all extension buildering work and keeping within budget and on quote. NKD...
From £17,884
Trusted and professional extension builder in Forest Hill. Experienced in all extension buildering work and keeping within budget and on quote. RM ...
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 £17,708
Need to find an Extension Builder near you for all your extension buildering work?
Albion Roofing Solutions provides a local, trusted exten...
From £17,748
Baseline Build and Renovate Ltd is an established extension buildering business in Forest Hill. We come highly recommended and provide competitive ...
From £17,492
Five Sextillion is an established and experienced local extension builder in Forest Hill. Please contact us for a free, no obligation quote and com...
From £17,772
BERNARD CONSTRUCTION LTD are here to help customers who need an Extension Builder in Forest Hill. We offer a competitive rate to complete all your ...

Underpinning ranges from £17,404 (STOYANOV CONSTRUCTION LTD based in SE23) to £17,924 (Claudiu Mihaila based in SE23), 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 Forest Hill by posting a job with HaMuch and we will send it to extension builders in Forest Hill.
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 - £17,657

Two storey extension - £88,235

Build a timber frame extension - £26,157

Build a swimming pool - £81,157

Single storey extension - £58,136

Side return extension - £43,264

Install an RSJ - £2,357

Outbuilding - £10,157

Build a Mansard loft conversion - £52,157

Loft conversion - £35,220

Build a kitchen extension - £42,157

Hip to gable loft conversion - £42,157

Granny annexe - £87,157

Garden office - £10,157

Convert a Garage - £16,157

Garage - £18,657

Build a flat roof extension - £22,157

Build a dormer loft conversion - £42,157

Concrete foundations - £6,407

Convert a bungalow loft - £29,157

Convert a basement - £39,264