Silicone Render System Ltd is a plastering company based in Porthcawl, with over 20 years’ experience in the plastering trade. W...
Barlam Drylining Ltd are here to help customers who need an Extension Builder in SA12. We offer a competitive rate to complete all your extension b...
Local builder services CENTER "I, YOU, WE" CIC. Exterior building work build or repair a path or driveway construct or restore an ...
The Rod Squad is a trusted extension builder serving customers in SA12 and the surrounding area. Contact us to today to get a competitive quote for...
KAW Developments is a trusted extension builder serving customers in SA12 and the surrounding area. Contact us to today to get a competitive quote ...
Experienced extension builder ready to quote for your work. Improve Not Move is the best extension builder in SA12. No obligation free quotes and m...
Karina Lane Construction Ltd are here to help customers who need an Extension Builder in SA12. We offer a competitive rate to complete all your ext...
Homekare Building Services Ltd is an established and experienced local extension builder in SA12. Please contact us for a free, no obligation quote...
Relax... you have found a reliable extension builder in SA12. Signature Project Solutions Ltd is a friendly and reliable company based in SA12 who ...
Trusted and professional extension builder in SA12. Experienced in all extension buildering work and keeping within budget and on quote. Masterbuil...

Underpinning ranges from £17,076 (Homekare Building Services Ltd based in SA5) to £19,580 (Silicone Rendering Systems Ltd based in CF36), 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 SA12 by posting a job with HaMuch and we will send it to extension builders in SA12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Port Talbot | £31 | £227 |
| Underpin A Building near Neath | £30 | £225 |
| Underpin A Building near Maesteg | £38 | £283 |
| Underpin A Building near Neath Port Talbot | £31 | £224 |
| Underpin A Building near Swansea | £29 | £229 |
| Underpin A Building near Pyle | £34 | £262 |
| Underpin A Building near Porthcawl | £33 | £252 |
| Underpin A Building near Bridgend | £32 | £200 |
| Underpin A Building near Gorseinon | £29 | £228 |
| Underpin A Building near Rhondda | £31 | £206 |
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 - £17,517

Two storey extension - £88,025

Build a timber frame extension - £26,017

Build a swimming pool - £81,017

Single storey extension - £55,336

Side return extension - £41,689

Install an RSJ - £2,217

Outbuilding - £10,017

Build a Mansard loft conversion - £52,017

Loft conversion - £33,908

Build a kitchen extension - £42,017

Hip to gable loft conversion - £42,017

Granny annexe - £87,017

Garden office - £10,017

Convert a Garage - £16,017

Garage - £18,517

Build a flat roof extension - £22,017

Build a dormer loft conversion - £42,017

Concrete foundations - £6,267

Convert a bungalow loft - £29,017

Convert a basement - £37,689