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 £17,236
The Rod Squad is a trusted extension builder serving customers in SA18 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 SA18 and the surrounding area. Contact us to today to get a competitive quote ...
From £17,500
Experienced extension builder ready to quote for your work. Improve Not Move is the best extension builder in SA18. No obligation free quotes and m...
From £17,132
Karina Lane Construction Ltd are here to help customers who need an Extension Builder in SA18. We offer a competitive rate to complete all your ext...
From £17,076
Homekare Building Services Ltd is an established and experienced local extension builder in SA18. Please contact us for a free, no obligation quote...
From £17,516
Relax... you have found a reliable extension builder in SA18. Signature Project Solutions Ltd is a friendly and reliable company based in SA18 who ...
From £17,212
Trusted and professional extension builder in SA18. Experienced in all extension buildering work and keeping within budget and on quote. Masterbuil...
From £17,116
Need to find an Extension Builder near you for all your extension buildering work?
Max Sandford & San provides a local, trusted extension b...
From £18,524
Need an Extension Builder in SA18? KD Construction has been helping local clients (20 mile radius) with their extension buildering jobs for many ye...

Underpinning ranges from £17,076 (Homekare Building Services Ltd based in SA5) to £18,524 (KD Construction based in SA15), 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 SA18 by posting a job with HaMuch and we will send it to extension builders in SA18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Gorseinon | £29 | £228 |
| Underpin A Building near Neath | £30 | £225 |
| Underpin A Building near Llanelli | £29 | £231 |
| Underpin A Building near Neath Port Talbot | £31 | £224 |
| Underpin A Building near Swansea | £29 | £229 |
| Underpin A Building near Carmarthen | £26 | £205 |
| Underpin A Building near Carmarthenshire | £26 | £205 |
| Underpin A Building near Port Talbot | £31 | £227 |
| Underpin A Building near Maesteg | £38 | £283 |
| Underpin A Building near Pyle | £34 | £262 |
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 - £17,383

Two storey extension - £87,825

Build a timber frame extension - £25,883

Build a swimming pool - £80,883

Single storey extension - £52,664

Side return extension - £40,186

Install an RSJ - £2,083

Outbuilding - £9,883

Build a Mansard loft conversion - £51,883

Loft conversion - £32,655

Build a kitchen extension - £41,883

Hip to gable loft conversion - £41,883

Granny annexe - £86,883

Garden office - £9,883

Convert a Garage - £15,883

Garage - £18,383

Build a flat roof extension - £21,883

Build a dormer loft conversion - £41,883

Concrete foundations - £6,133

Convert a bungalow loft - £28,883

Convert a basement - £36,186