From £18,044
GARY G BOND LIMITED are here to help customers who need an Extension Builder in SN15. We offer a competitive rate to complete all your extension bu...
From £17,356
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,580
HYATT BUILDING SERVICES are here to help customers who need an Extension Builder in SN15. We offer a competitive rate to complete all your extensio...
From £17,300
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
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 £17,652
Prestige Build Services LTD is a trusted extension builder serving customers in SN15 and the surrounding area. Contact us to today to get a competi...
From £17,252
Concept Solutions Bristol Ltd is an established and experienced local extension builder in SN15. Please contact us for a free, no obligation quote ...
From £17,324
24 7 BUILDING SOLUTIONS LTD is a trusted extension builder serving customers in SN15 and the surrounding area. Contact us to today to get a competi...
From £17,036
Need an Extension Builder in SN15? R PEARCE BUILDING has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
From £17,596
MJ solutions is an established and experienced local extension builder in SN15. Please contact us for a free, no obligation quote and competitive ...

Underpinning ranges from £17,036 (R PEARCE BUILDING based in SN15) to £18,044 (GARY G BOND LIMITED based in BS16), 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 SN15 by posting a job with HaMuch and we will send it to extension builders in SN15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Calne | £29 | £225 |
| Underpin A Building near Chippenham | £34 | £258 |
| Underpin A Building near West Wiltshire | £32 | £242 |
| Underpin A Building near North Wiltshire | £32 | £242 |
| Underpin A Building near Devizes | £32 | £242 |
| Underpin A Building near Trowbridge | £34 | £266 |
| Underpin A Building near Swindon | £38 | £238 |
| Underpin A Building near Thamesdown | £38 | £239 |
| Underpin A Building near Yate | £34 | £263 |
| Underpin A Building near Stratton St Margaret | £37 | £238 |
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 - £17,482

Two storey extension - £87,974

Build a timber frame extension - £25,982

Build a swimming pool - £80,982

Single storey extension - £54,648

Side return extension - £41,302

Install an RSJ - £2,182

Outbuilding - £9,982

Build a Mansard loft conversion - £51,982

Loft conversion - £33,585

Build a kitchen extension - £41,982

Hip to gable loft conversion - £41,982

Granny annexe - £86,982

Garden office - £9,982

Convert a Garage - £15,982

Garage - £18,482

Build a flat roof extension - £21,982

Build a dormer loft conversion - £41,982

Concrete foundations - £6,232

Convert a bungalow loft - £28,982

Convert a basement - £37,302