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 £17,404
Need to find an Extension Builder near you for all your extension buildering work?
M J LLEWLLYN BUILDING SERVICES provides a local, trusted...
From £17,684
Need to find an Extension Builder near you for all your extension buildering work?
WILSONS BUILDERS CO LTD provides a local, trusted extens...
From £17,508
Gastropod Services is an established and experienced local extension builder in GL12. Please contact us for a free, no obligation quote and competi...
From £17,700
Trusted and professional extension builder in GL12. Experienced in all extension buildering work and keeping within budget and on quote. C M M Buil...
From £17,764
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,452
Need to find an Extension Builder near you for all your extension buildering work?
All Point Building provides a local, trusted extension b...
From £17,412
Experienced extension builder ready to quote for your work. G & J BUILDING MAINTENANCE is the best extension builder in GL12. No obligation free qu...
From £17,708
E R HEMMINGS (BUILDING) LTD is an established and experienced local extension builder in GL12. Please contact us for a free, no obligation quote an...
From £17,396
E R HEMMINGS (BUILDING) LTD are here to help customers who need an Extension Builder in GL12. We offer a competitive rate to complete all your exte...

Underpinning ranges from £17,396 (E R HEMMINGS (BUILDING) LTD based in BS37) to £17,764 (CJW BUILDING SERVICES LIMITED based in BS37), 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 GL12 by posting a job with HaMuch and we will send it to extension builders in GL12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Yate | £34 | £263 |
| Underpin A Building near South Gloucestershire | £34 | £260 |
| Underpin A Building near Bradley Stoke | £34 | £259 |
| Underpin A Building near Stroud | £33 | £249 |
| Underpin A Building near Kingswood | £34 | £257 |
| Underpin A Building near Chippenham | £34 | £258 |
| Underpin A Building near Quedgeley | £32 | £247 |
| Underpin A Building near Bristol | £33 | £255 |
| Underpin A Building near Clifton | £33 | £255 |
| Underpin A Building near Keynsham | £33 | £251 |
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 - £17,562

Two storey extension - £88,094

Build a timber frame extension - £26,062

Build a swimming pool - £81,062

Single storey extension - £56,248

Side return extension - £42,202

Install an RSJ - £2,262

Outbuilding - £10,062

Build a Mansard loft conversion - £52,062

Loft conversion - £34,335

Build a kitchen extension - £42,062

Hip to gable loft conversion - £42,062

Granny annexe - £87,062

Garden office - £10,062

Convert a Garage - £16,062

Garage - £18,562

Build a flat roof extension - £22,062

Build a dormer loft conversion - £42,062

Concrete foundations - £6,312

Convert a bungalow loft - £29,062

Convert a basement - £38,202