From £17,628
Greater London, CR8
Relax... you have found a reliable extension builder in CR8. CBK Design & Build is a friendly and reliable company based in CR8 who consider no job...
From £17,756
Relax... you have found a reliable extension builder in CR8. Neats General Builders is a friendly and reliable company based in CR8 who consider no...
From £17,516
Surrey, CR8
Need to find an Extension Builder near you for all your extension buildering work?
Harrington Builders Kenley Ltd provides a local, trusted...
From £17,748
We are a South London Based construction company with a passion for building. We pride ourselves in fast paced, high quality work to suit every bud...
From £17,284
We offer single room decorations to full house refurbishment using products and materials as discussed with clients
From £17,948
Experienced extension builder ready to quote for your work. Palatium Properties Ltd is the best extension builder in CR8. No obligation free quotes...
From £17,852
Gre, CR8
The Original Roofing Company are here to help customers who need an Extension Builder in CR8. We offer a competitive rate to complete all your exte...
From £17,476
R D Builders is an established extension buildering business in CR8. We come highly recommended and provide competitive quotes for your work.
From £17,564
Purley, CR8
EKJ Construction are here to help customers who need an Extension Builder in CR8. We offer a competitive rate to complete all your extension builde...
From £18,140
Trusted and professional extension builder in CR8. Experienced in all extension buildering work and keeping within budget and on quote. G&R CONSTRU...

Underpinning ranges from £17,284 (PGHomecare Ltd based in CR2) to £18,140 (G&R CONSTRUCTION LTD based in CR8), 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 CR8 by posting a job with HaMuch and we will send it to extension builders in CR8.
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 - £17,691

Two storey extension - £88,287

Build a timber frame extension - £26,191

Build a swimming pool - £81,191

Single storey extension - £58,824

Side return extension - £43,651

Install an RSJ - £2,391

Outbuilding - £10,191

Build a Mansard loft conversion - £52,191

Loft conversion - £35,543

Build a kitchen extension - £42,191

Hip to gable loft conversion - £42,191

Granny annexe - £87,191

Garden office - £10,191

Convert a Garage - £16,191

Garage - £18,691

Build a flat roof extension - £22,191

Build a dormer loft conversion - £42,191

Concrete foundations - £6,441

Convert a bungalow loft - £29,191

Convert a basement - £39,651