Alan Gaddarn
Very reliable honest and hard working guarantee all work clean and tidy first class work
Barlam Drylining Ltd are here to help customers who need an Extension Builder in Blackwood. We offer a competitive rate to complete all your extens...
Need an Extension Builder in Blackwood? P.D.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
Experienced extension builder ready to quote for your work. Limitlesskitchens is the best extension builder in Blackwood. No obligation free quotes...
Need to find an Extension Builder near you for all your extension buildering work?
PARTRIDGE - WILSON BUILDERS provides a local, trusted ex...
D BENDON CONSTRUCTION LTD is an established and experienced local extension builder in Blackwood. Please contact us for a free, no obligation quote...
Gareth Thorpe
G T Brickwork is an established extension buildering business in Blackwood. We come highly recommended and provide competitive quotes for your work...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
, 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 £16,700 (A.Gaddarn Builders based in NP11) 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 Blackwood by posting a job with HaMuch and we will send it to extension builders in Blackwood.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Pontypool | £30 | £210 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Cwmbran | £43 | £219 |
| Underpin A Building near Tredegar | £30 | £217 |
| Underpin A Building near Ebbw Vale | £30 | £217 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Merthyr Tydfil | £33 | £220 |
| Underpin A Building near Rhondda, Cynon, Taff | £31 | £209 |
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 - £17,228

Two storey extension - £87,592

Build a timber frame extension - £25,728

Build a swimming pool - £80,728

Single storey extension - £49,560

Side return extension - £38,440

Install an RSJ - £1,928

Outbuilding - £9,728

Build a Mansard loft conversion - £51,728

Loft conversion - £31,200

Build a kitchen extension - £41,728

Hip to gable loft conversion - £41,728

Granny annexe - £86,728

Garden office - £9,728

Convert a Garage - £15,728

Garage - £18,228

Build a flat roof extension - £21,728

Build a dormer loft conversion - £41,728

Concrete foundations - £5,978

Convert a bungalow loft - £28,728

Convert a basement - £34,440