From £17,572
O Dent Carpentry & Building Services is an established and experienced local extension builder in SN4. Please contact us for a free, no obligation ...
From £17,428
Need an Extension Builder in SN4? KP BUILDERS (SWINDON) LTD has been helping local clients (20 mile radius) with their jobs for many years. Get a ...
From £17,300
Need an Extension Builder in SN4? SAXON DESIGN & BUILD LTD has been helping local clients (20 mile radius) with their jobs for many years. Get a q...
From £17,812
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of work in SN4 and...
From £17,372
Craig Donnelly Building Contractors Ltd is a trusted extension builder serving customers in SN4 and the surrounding area. Contact us to today to ge...
From £17,420
Complete Driveway Solutions is an established and experienced local extension builder in SN4. Please contact us for a free, no obligation quote and...
From £17,652
DP BUILDING is an established business in SN4. We come highly recommended and provide competitive quotes for your work.
From £17,652
Need to find an Extension Builder near you for all your work?
A S A BUILDING SERVICES LTD provides a local, trusted service in and around...
From £17,452
A D BUILDING SERVICES T/A is a trusted extension builder serving customers in SN4 and the surrounding area. Contact us to today to get a competitiv...
From £16,980
MR HOWELL are here to help customers who need an Extension Builder in SN4. We offer a competitive rate to complete all your jobs to professional s...

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 SN4 by posting a job with HaMuch and we will send it to extension builders in SN4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Swindon | £32 | £207 |
| Underpin A Building near Stratton St Margaret | £32 | £208 |
| Underpin A Building near Thamesdown | £32 | £208 |
| Underpin A Building near Calne | £26 | £201 |
| Underpin A Building near North Wiltshire | £29 | £218 |
| Underpin A Building near West Wiltshire | £29 | £218 |
| Underpin A Building near Devizes | £29 | £218 |
| Underpin A Building near Vale of White Horse | £32 | £242 |
| Underpin A Building near Chippenham | £29 | £218 |
| Underpin A Building near Trowbridge | £29 | £223 |
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 - £17,464

Two storey extension - £87,946

Build a timber frame extension - £25,964

Build a swimming pool - £80,964

Single storey extension - £54,280

Side return extension - £41,095

Install an RSJ - £2,164

Outbuilding - £9,964

Build a Mansard loft conversion - £51,964

Loft conversion - £33,413

Build a kitchen extension - £41,964

Hip to gable loft conversion - £41,964

Granny annexe - £86,964

Garden office - £9,964

Convert a Garage - £15,964

Garage - £18,464

Build a flat roof extension - £21,964

Build a dormer loft conversion - £41,964

Concrete foundations - £6,214

Convert a bungalow loft - £28,964

Convert a basement - £37,095