From £17,108
Relax... you have found a reliable extension builder in NP4. HEDLYN BUILDING CONTRACTORS is a friendly and reliable company based in NP4 who consi...
From £17,268
Our building services company JSP Carpentry & Building Services has 15 years of experience in the industry. Since then, we have been helping custom...
From £17,068
D BENDON CONSTRUCTION LTD is an established and experienced local extension builder in NP4. Please contact us for a free, no obligation quote and c...
From £17,244
OWEN BROTHERS CONSTRUCTION LTD are here to help customers who need an Extension Builder in NP4. We offer a competitive rate to complete all your ex...
From £17,300
Need to find an Extension Builder near you for all your extension buildering work?
A B CONSTRUCTION provides a local, trusted extension bui...
From £17,060
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,484
Need to find an Extension Builder near you for all your extension buildering work?
PARTRIDGE - WILSON BUILDERS provides a local, trusted ex...
From £16,916
Trusted and professional extension builder in NP4. Experienced in all extension buildering work and keeping within budget and on quote. M2 Building...
From £17,324
LEE BAILEY BUILDING SERVICES are here to help customers who need an Extension Builder in NP4. We offer a competitive rate to complete all your exte...
From £17,364
, NP44
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,916 (M2 Building & Landscaping based in NP13) to £17,484 (PARTRIDGE - WILSON BUILDERS based in NP44), 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 NP4 by posting a job with HaMuch and we will send it to extension builders in NP4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Pontypool | £30 | £210 |
| Underpin A Building near Cwmbran | £43 | £219 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Ebbw Vale | £28 | £218 |
| Underpin A Building near Newport | £41 | £233 |
| Underpin A Building near Tredegar | £28 | £218 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Merthyr Tydfil | £33 | £220 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Church Village | £34 | £214 |
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 - £17,214

Two storey extension - £87,570

Build a timber frame extension - £25,714

Build a swimming pool - £80,714

Single storey extension - £49,272

Side return extension - £38,278

Install an RSJ - £1,914

Outbuilding - £9,714

Build a Mansard loft conversion - £51,714

Loft conversion - £31,065

Build a kitchen extension - £41,714

Hip to gable loft conversion - £41,714

Granny annexe - £86,714

Garden office - £9,714

Convert a Garage - £15,714

Garage - £18,214

Build a flat roof extension - £21,714

Build a dormer loft conversion - £41,714

Concrete foundations - £5,964

Convert a bungalow loft - £28,714

Convert a basement - £34,278