From £17,196
Swindon, SN1
CORE CONSTRUCTION is an established extension buildering business in Swindon. We come highly recommended and provide competitive quotes for your wo...
From £17,812
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,388
Relax... you have found a reliable extension builder in Swindon. Ktirio is a friendly and reliable company based in Swindon who consider no job as ...
From £17,388
ABC Builders is a trusted extension builder serving customers in Swindon and the surrounding area. Contact us to today to get a competitive quote f...
From £17,372
Swindon, SN1
Craig Donnelly Building Contractors Ltd is a trusted extension builder serving customers in Swindon and the surrounding area. Contact us to today t...
From £17,420
Swindon, SN1
Complete Driveway Solutions is an established and experienced local extension builder in Swindon. Please contact us for a free, no obligation quote...
From £17,300
Swindon, SN1
Need an Extension Builder in Swindon? SAXON DESIGN & BUILD LTD has been helping local clients (20 mile radius) with their extension buildering jobs...
From £17,452
A D BUILDING SERVICES T/A is a trusted extension builder serving customers in Swindon and the surrounding area. Contact us to today to get a compet...
From £16,980
Swindon, SN3
MR HOWELL are here to help customers who need an Extension Builder in Swindon. We offer a competitive rate to complete all your extension builderin...
From £17,652
DP BUILDING is an established extension buildering business in Swindon. We come highly recommended and provide competitive quotes for your work.

Underpinning ranges from £16,980 (MR HOWELL based in SN3) 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 Swindon by posting a job with HaMuch and we will send it to extension builders in Swindon.
"Underpin a building" - SN3, job posted 09/05/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Swindon | £38 | £238 |
| Underpin A Building near Stratton St Margaret | £37 | £238 |
| Underpin A Building near Thamesdown | £38 | £239 |
| 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 Devizes | £32 | £242 |
| Underpin A Building near Chippenham | £34 | £258 |
| Underpin A Building near Witney | £32 | £244 |
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 - £17,396

Two storey extension - £87,844

Build a timber frame extension - £25,896

Build a swimming pool - £80,896

Single storey extension - £52,920

Side return extension - £40,330

Install an RSJ - £2,096

Outbuilding - £9,896

Build a Mansard loft conversion - £51,896

Loft conversion - £32,775

Build a kitchen extension - £41,896

Hip to gable loft conversion - £41,896

Granny annexe - £86,896

Garden office - £9,896

Convert a Garage - £15,896

Garage - £18,396

Build a flat roof extension - £21,896

Build a dormer loft conversion - £41,896

Concrete foundations - £6,146

Convert a bungalow loft - £28,896

Convert a basement - £36,330