From £17,652
Prestige Build Services LTD is a trusted extension builder serving customers in SN5 and the surrounding area. Contact us to today to get a competit...
From £17,428
Need an Extension Builder in SN5? KP BUILDERS (SWINDON) LTD has been helping local clients (20 mile radius) with their extension buildering jobs fo...
From £17,228
SWIFT DESIGN & BUILD LTD are here to help customers who need an Extension Builder in SN5. We offer a competitive rate to complete all your extensio...
From £17,740
Experienced extension builder ready to quote for your work. Biocraft South West Ltd is the best extension builder in SN5. No obligation free quotes...
From £17,324
R & R BUILDERS is an established and experienced local extension builder in SN5. Please contact us for a free, no obligation quote and competitive ...
From £16,956
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,420
Complete Driveway Solutions is an established and experienced local extension builder in SN5. Please contact us for a free, no obligation quote and...
From £17,372
Craig Donnelly Building Contractors Ltd is a trusted extension builder serving customers in SN5 and the surrounding area. Contact us to today to ge...
From £17,596
MJ solutions is an established and experienced local extension builder in SN5. Please contact us for a free, no obligation quote and competitive r...
From £17,812
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,956 (Watts Builders based in SN25) to £17,812 (The trade collective ltd based in Sn1), 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 SN5 by posting a job with HaMuch and we will send it to extension builders in SN5.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Swindon | £38 | £238 |
| Underpin A Building near Thamesdown | £38 | £239 |
| Underpin A Building near Stratton St Margaret | £37 | £238 |
| Underpin A Building near Calne | £29 | £225 |
| Underpin A Building near Vale of White Horse | £36 | £271 |
| Underpin A Building near West Wiltshire | £32 | £242 |
| Underpin A Building near North Wiltshire | £32 | £242 |
| Underpin A Building near Chippenham | £34 | £258 |
| Underpin A Building near Devizes | £32 | £242 |
| Underpin A Building near Stroud | £33 | £249 |
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 - £17,453

Two storey extension - £87,929

Build a timber frame extension - £25,953

Build a swimming pool - £80,953

Single storey extension - £54,056

Side return extension - £40,969

Install an RSJ - £2,153

Outbuilding - £9,953

Build a Mansard loft conversion - £51,953

Loft conversion - £33,308

Build a kitchen extension - £41,953

Hip to gable loft conversion - £41,953

Granny annexe - £86,953

Garden office - £9,953

Convert a Garage - £15,953

Garage - £18,453

Build a flat roof extension - £21,953

Build a dormer loft conversion - £41,953

Concrete foundations - £6,203

Convert a bungalow loft - £28,953

Convert a basement - £36,969