From £17,508
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,924
Coulsdon, CR5
Relax... you have found a reliable extension builder in Coulsdon. Cynosure Construction Ltd is a friendly and reliable company based in Coulsdon wh...
From £17,628
Need to find an Extension Builder near you for all your extension buildering work?
BCW BUILDERS provides a local, trusted extension builder...
From £17,540
Surrey, CR5
Need to find an Extension Builder near you for all your extension buildering work?
Duo Builders provides a local, trusted extension builder...
From £17,460
Duo Builders, offers customers a high end service for all domestic building works. Our highly qualified team undertake Design, Build and Maintenan...
From £17,932
Coulsdon, CR5
BnC are a family-run business with an outstanding reputation throughout our trade, we love our job and take pride in every aspect of our work. We s...
From £18,140
Trusted and professional extension builder in Coulsdon. Experienced in all extension buildering work and keeping within budget and on quote. G&R CO...
From £17,820
Coulsdon, CR5
G F Hobbs t/a G & N Builders is an established and experienced local extension builder in Coulsdon. Please contact us for a free, no obligation quo...
From £17,852
The Original Roofing Company are here to help customers who need an Extension Builder in Coulsdon. We offer a competitive rate to complete all your...
From £17,796
Surrey, CR5
Need an Extension Builder in Coulsdon? AJ Building Group has been helping local clients (10 mile radius) with their extension buildering jobs for m...

Underpinning ranges from £17,460 (Duo Builders based in CR5) 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 Coulsdon by posting a job with HaMuch and we will send it to extension builders in Coulsdon.
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 - £17,760

Two storey extension - £88,390

Build a timber frame extension - £26,260

Build a swimming pool - £81,260

Single storey extension - £60,200

Side return extension - £44,425

Install an RSJ - £2,460

Outbuilding - £10,260

Build a Mansard loft conversion - £52,260

Loft conversion - £36,188

Build a kitchen extension - £42,260

Hip to gable loft conversion - £42,260

Granny annexe - £87,260

Garden office - £10,260

Convert a Garage - £16,260

Garage - £18,760

Build a flat roof extension - £22,260

Build a dormer loft conversion - £42,260

Concrete foundations - £6,510

Convert a bungalow loft - £29,260

Convert a basement - £40,425