From £17,052
Need an Extension Builder in SA6? Calon Construction Ltd has been helping local clients (20 mile radius) with their extension buildering jobs for m...
From £17,436
A Room at the Top are here to help customers who need an Extension Builder in SA6. We offer a competitive rate to complete all your extension build...
From £17,132
Karina Lane Construction Ltd are here to help customers who need an Extension Builder in SA6. We offer a competitive rate to complete all your exte...
From £17,236
The Rod Squad is a trusted extension builder serving customers in SA6 and the surrounding area. Contact us to today to get a competitive quote for ...
From £17,276
KAW Developments is a trusted extension builder serving customers in SA6 and the surrounding area. Contact us to today to get a competitive quote f...
From £17,244
Local builder services CENTER "I, YOU, WE" CIC. Exterior building work build or repair a path or driveway construct or restore an ...
From £17,260
Marin Hughes General Builders is a trusted extension builder serving customers in SA6 and the surrounding area. Contact us to today to get a compet...
From £17,076
Homekare Building Services Ltd is an established and experienced local extension builder in SA6. Please contact us for a free, no obligation quote ...
From £17,212
Trusted and professional extension builder in SA6. Experienced in all extension buildering work and keeping within budget and on quote. Masterbuild...
From £17,396
Fit kitchens and more ltd is an established and experienced local extension builder in SA6. Please contact us for a free, no obligation quote and c...

Underpinning ranges from £17,052 (Calon Construction Ltd based in SA7) to £17,436 (A Room at the Top based in SA7), 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 SA6 by posting a job with HaMuch and we will send it to extension builders in SA6.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Swansea | £29 | £229 |
| Underpin A Building near Neath | £30 | £225 |
| Underpin A Building near Gorseinon | £29 | £228 |
| Underpin A Building near Neath Port Talbot | £31 | £224 |
| Underpin A Building near Port Talbot | £31 | £227 |
| Underpin A Building near Llanelli | £29 | £231 |
| Underpin A Building near Maesteg | £38 | £283 |
| Underpin A Building near Pyle | £34 | £262 |
| Underpin A Building near Porthcawl | £33 | £252 |
| Underpin A Building near Bridgend | £32 | £200 |
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 - £17,232

Two storey extension - £87,598

Build a timber frame extension - £25,732

Build a swimming pool - £80,732

Single storey extension - £49,640

Side return extension - £38,485

Install an RSJ - £1,932

Outbuilding - £9,732

Build a Mansard loft conversion - £51,732

Loft conversion - £31,238

Build a kitchen extension - £41,732

Hip to gable loft conversion - £41,732

Granny annexe - £86,732

Garden office - £9,732

Convert a Garage - £15,732

Garage - £18,232

Build a flat roof extension - £21,732

Build a dormer loft conversion - £41,732

Concrete foundations - £5,982

Convert a bungalow loft - £28,732

Convert a basement - £34,485