From £17,396
Fit kitchens and more ltd is an established and experienced local extension builder in SA1. Please contact us for a free, no obligation quote and c...
From £17,212
Trusted and professional extension builder in SA1. Experienced in all extension buildering work and keeping within budget and on quote. Masterbuild...
From £17,500
R.H Damp Proofing are here to help customers who need an Extension Builder in SA1. We offer a competitive rate to complete all your extension build...
From £17,436
24/7 EMERGANCY CALLOUT FOR BLOCKED DRAINS NO CALLOUT FEE
We are a family run business of over 30 years experience in the Swansea and sur...
From £17,220
Relax... you have found a reliable extension builder in SA1. MOUNT PLEASENT BUILDING is a friendly and reliable company based in SA1 who consider n...
From £17,076
Homekare Building Services Ltd is an established and experienced local extension builder in SA1. Please contact us for a free, no obligation quote ...
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 £17,276
KAW Developments is a trusted extension builder serving customers in SA1 and the surrounding area. Contact us to today to get a competitive quote f...
From £17,236
The Rod Squad is a trusted extension builder serving customers in SA1 and the surrounding area. Contact us to today to get a competitive quote for ...
From £17,500
Experienced extension builder ready to quote for your work. Improve Not Move is the best extension builder in SA1. No obligation free quotes and ma...

Underpinning ranges from £17,076 (Homekare Building Services Ltd based in SA5) to £17,500 (R.H Damp Proofing based in SA1), 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 SA1 by posting a job with HaMuch and we will send it to extension builders in SA1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Swansea | £29 | £229 |
| Underpin A Building near Gorseinon | £29 | £228 |
| Underpin A Building near Neath | £30 | £225 |
| Underpin A Building near Port Talbot | £31 | £227 |
| Underpin A Building near Neath Port Talbot | £31 | £224 |
| 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 - £17,310

Two storey extension - £87,714

Build a timber frame extension - £25,810

Build a swimming pool - £80,810

Single storey extension - £51,192

Side return extension - £39,358

Install an RSJ - £2,010

Outbuilding - £9,810

Build a Mansard loft conversion - £51,810

Loft conversion - £31,965

Build a kitchen extension - £41,810

Hip to gable loft conversion - £41,810

Granny annexe - £86,810

Garden office - £9,810

Convert a Garage - £15,810

Garage - £18,310

Build a flat roof extension - £21,810

Build a dormer loft conversion - £41,810

Concrete foundations - £6,060

Convert a bungalow loft - £28,810

Convert a basement - £35,358