From £17,412
Experienced extension builder ready to quote for your work. G & J BUILDING MAINTENANCE is the best extension builder in BS35. No obligation free qu...
From £17,532
Trusted and professional extension builder in BS35. Experienced in all extension buildering work and keeping within budget and on quote. M A Church...
From £17,684
Need to find an Extension Builder near you for all your extension buildering work?
WILSONS BUILDERS CO LTD provides a local, trusted extens...
From £17,668
Need an Extension Builder in BS35? Alistair McKenzie has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
From £17,268
JAS Building Services is an established and experienced local extension builder in BS35. Please contact us for a free, no obligation quote and comp...
From £17,564
Dybowski Building Services are here to help customers who need an Extension Builder in BS35. We offer a competitive rate to complete all your exten...
From £17,492
Relax... you have found a reliable extension builder in BS35. Singh Residentials is a friendly and reliable company based in BS35 who consider no j...
From £17,404
Need to find an Extension Builder near you for all your extension buildering work?
M J LLEWLLYN BUILDING SERVICES provides a local, trusted...
From £17,596
Stag Design & Build is the ultimate package for your Extension, New Build, Renovations and all other aspects involving the construction industry, d...
From £17,628
BM Builders UK are here to help customers who need an Extension Builder in BS35. We offer a competitive rate to complete all your extension builder...

Underpinning ranges from £17,268 (JAS Building Services based in BS34) to £17,684 (WILSONS BUILDERS CO LTD based in GL12), 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 BS35 by posting a job with HaMuch and we will send it to extension builders in BS35.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Bradley Stoke | £34 | £259 |
| Underpin A Building near South Gloucestershire | £34 | £260 |
| Underpin A Building near Yate | £34 | £263 |
| Underpin A Building near Kingswood | £34 | £257 |
| Underpin A Building near Bristol | £33 | £255 |
| Underpin A Building near Clifton | £33 | £255 |
| Underpin A Building near Portishead | £33 | £247 |
| Underpin A Building near Keynsham | £33 | £251 |
| Underpin A Building near Clevedon | £32 | £243 |
| Underpin A Building near Chippenham | £34 | £258 |
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 - £17,525

Two storey extension - £88,037

Build a timber frame extension - £26,025

Build a swimming pool - £81,025

Single storey extension - £55,496

Side return extension - £41,779

Install an RSJ - £2,225

Outbuilding - £10,025

Build a Mansard loft conversion - £52,025

Loft conversion - £33,983

Build a kitchen extension - £42,025

Hip to gable loft conversion - £42,025

Granny annexe - £87,025

Garden office - £10,025

Convert a Garage - £16,025

Garage - £18,525

Build a flat roof extension - £22,025

Build a dormer loft conversion - £42,025

Concrete foundations - £6,275

Convert a bungalow loft - £29,025

Convert a basement - £37,779