From £17,564
Trusted and professional extension builder in SN8. Experienced in all extension buildering work and keeping within budget and on quote. Bellamy Gro...
From £17,676
Need to find an Extension Builder near you for all your extension buildering work?
A4 BUILDING & RENOVATION LTD provides a local, trusted e...
From £17,652
Need to find an Extension Builder near you for all your extension buildering work?
A S A BUILDING SERVICES LTD provides a local, trusted ex...
From £17,508
WESTHILL BUILDERS is a trusted extension builder serving customers in SN8 and the surrounding area. Contact us to today to get a competitive quote ...
From £17,668
Trusted and professional extension builder in SN8. Experienced in all extension buildering work and keeping within budget and on quote. Sarsen Ener...
From £17,652
DP BUILDING is an established extension buildering business in SN8. We come highly recommended and provide competitive quotes for your work.
From £17,412
Quite simply we love all things design, build and interior design. Thats why we have spent the last fourteen years getting our hands dirty in our ...
From £17,452
A D BUILDING SERVICES T/A is a trusted extension builder serving customers in SN8 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 SN8. We offer a competitive rate to complete all your extension buildering jo...
From £17,300
Need an Extension Builder in SN8? SAXON DESIGN & BUILD LTD has been helping local clients (20 mile radius) with their extension buildering jobs for...

Underpinning ranges from £16,980 (MR HOWELL based in SN3) to £17,676 (A4 BUILDING & RENOVATION LTD based in RG17), 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 SN8 by posting a job with HaMuch and we will send it to extension builders in SN8.
| 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 Calne | £29 | £225 |
| 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 Thamesdown | £38 | £239 |
| Underpin A Building near Newbury | £37 | £262 |
| Underpin A Building near Andover | £40 | £248 |
| Underpin A Building near Vale of White Horse | £36 | £271 |
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 - £17,486

Two storey extension - £87,980

Build a timber frame extension - £25,986

Build a swimming pool - £80,986

Single storey extension - £54,728

Side return extension - £41,347

Install an RSJ - £2,186

Outbuilding - £9,986

Build a Mansard loft conversion - £51,986

Loft conversion - £33,623

Build a kitchen extension - £41,986

Hip to gable loft conversion - £41,986

Granny annexe - £86,986

Garden office - £9,986

Convert a Garage - £15,986

Garage - £18,486

Build a flat roof extension - £21,986

Build a dormer loft conversion - £41,986

Concrete foundations - £6,236

Convert a bungalow loft - £28,986

Convert a basement - £37,347