From £17,292
T Porter Buiding is an established and experienced local extension builder in CF23. Please contact us for a free, no obligation quote and competiti...
From £17,132
Relax... you have found a reliable extension builder in CF23. Charles Marshall Contracting Ltd is a friendly and reliable company based in CF23 who...
From £16,700
Very reliable honest and hard working guarantee all work clean and tidy first class work
From £17,260
Sharif General Builder is an established and experienced local extension builder in CF23. Please contact us for a free, no obligation quote and com...
From £17,228
Experienced extension builder ready to quote for your work. Limitlesskitchens is the best extension builder in CF23. No obligation free quotes and ...
From £17,380
Relax... you have found a reliable extension builder in CF23. A M I Construction is a friendly and reliable company based in CF23 who consider no j...
From £17,340
MOORLAND DESIGN & BUILD LTD are here to help customers who need an Extension Builder in CF23. We offer a competitive rate to complete all your exte...
From £17,228
Neil Causon & Son is an established and experienced local extension builder in CF23. Please contact us for a free, no obligation quote and competit...
From £17,260
Construction Jobs is an established and experienced local extension builder in CF23. Please contact us for a free, no obligation quote and competit...
From £17,316
Eric J Ivins is a trusted extension builder serving customers in CF23 and the surrounding area. Contact us to today to get a competitive quote for ...

Underpinning ranges from £16,700 (A.Gaddarn Builders based in NP11) to £17,380 (A M I Construction based in NP26), 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 CF23 by posting a job with HaMuch and we will send it to extension builders in CF23.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cardiff | £34 | £219 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Penarth | £35 | £218 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Newport | £41 | £233 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Barry | £33 | £218 |
| Underpin A Building near Cwmbran | £43 | £219 |
| 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 - £17,214

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