From £17,252
Experienced extension builder ready to quote for your work. Kingsley Developments is the best extension builder in NP20. No obligation free quotes ...
From £17,420
Kingsley Developments is an established and experienced local extension builder in NP20. Please contact us for a free, no obligation quote and comp...
From £17,260
Sharif General Builder is an established and experienced local extension builder in NP20. Please contact us for a free, no obligation quote and com...
From £17,212
PMW Property Services Ltd is an established and experienced local extension builder in NP20. Please contact us for a free, no obligation quote and ...
From £17,500
Trusted and professional extension builder in NP20. Experienced in all extension buildering work and keeping within budget and on quote. A P FORD B...
From £17,556
Matthew O'Brien is an established and experienced local extension builder in NP20. Please contact us for a free, no obligation quote and competitiv...
From £17,412
Relax... you have found a reliable extension builder in NP20. Ace Paving is a friendly and reliable company based in NP20 who consider no job as to...
From £17,428
Experienced extension builder ready to quote for your work. DAYS BUILDING SERVICES LTD is the best extension builder in NP20. No obligation free qu...
From £17,492
Relax... you have found a reliable extension builder in NP20. RKD Maintenance & Construction is a friendly and reliable company based in NP20 who c...
From £17,292
T Porter Buiding is an established and experienced local extension builder in NP20. Please contact us for a free, no obligation quote and competiti...

Underpinning ranges from £17,212 (PMW Property Services Ltd based in NP20) to £17,556 (Matthew O'Brien based in NP19), 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 NP20 by posting a job with HaMuch and we will send it to extension builders in NP20.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Newport | £37 | £200 |
| Underpin A Building near Cwmbran | £39 | £190 |
| Underpin A Building near Risca | £27 | £185 |
| Underpin A Building near Pontypool | £26 | £183 |
| Underpin A Building near Caerphilly | £29 | £181 |
| Underpin A Building near Cardiff | £30 | £190 |
| Underpin A Building near Clevedon | £29 | £219 |
| Underpin A Building near Portishead | £29 | £221 |
| Underpin A Building near Penarth | £31 | £189 |
| Underpin A Building near Church Village | £30 | £188 |
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 - £17,382

Two storey extension - £87,824

Build a timber frame extension - £25,882

Build a swimming pool - £80,882

Single storey extension - £52,648

Side return extension - £40,177

Install an RSJ - £2,082

Outbuilding - £9,882

Build a Mansard loft conversion - £51,882

Loft conversion - £32,648

Build a kitchen extension - £41,882

Hip to gable loft conversion - £41,882

Granny annexe - £86,882

Garden office - £9,882

Convert a Garage - £15,882

Garage - £18,382

Build a flat roof extension - £21,882

Build a dormer loft conversion - £41,882

Concrete foundations - £6,132

Convert a bungalow loft - £28,882

Convert a basement - £36,177