Barlam Drylining Ltd are here to help customers who need an Extension Builder in Treharris. We offer a competitive rate to complete all your extens...
P ALLEN BUILDERS is an established and experienced local extension builder in Treharris. Please contact us for a free, no obligation quote and comp...
Gareth Thorpe
G T Brickwork is an established extension buildering business in Treharris. 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...
Paul Goode
Need to find an Extension Builder near you for all your extension buildering work?
GOODE BUILDING SERVICES provides a local, trusted extens...
From £16,996
Trusted and professional extension builder in Treharris. Experienced in all extension buildering work and keeping within budget and on quote. RJ CO...
From £17,028
Need an Extension Builder in Treharris? A POWELL CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering j...
From £17,348
Atlantic Building Services Ltd is an established extension buildering business in Treharris. We come highly recommended and provide competitive quo...
From £17,444
Trusted and professional extension builder in Treharris. Experienced in all extension buildering work and keeping within budget and on quote. BIs G...

Underpinning ranges from £16,996 (RJ CONSTRUCTION based in CF40) to £17,444 (BIs Group based in NP12), 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 Treharris by posting a job with HaMuch and we will send it to extension builders in Treharris.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Rhondda, Cynon, Taff | £31 | £209 |
| Underpin A Building near Rhondda | £31 | £206 |
| Underpin A Building near Merthyr Tydfil | £33 | £220 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Tredegar | £30 | £217 |
| Underpin A Building near Aberdare | £32 | £212 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Ebbw Vale | £30 | £217 |
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 - £17,236

Two storey extension - £87,604

Build a timber frame extension - £25,736

Build a swimming pool - £80,736

Single storey extension - £49,720

Side return extension - £38,530

Install an RSJ - £1,936

Outbuilding - £9,736

Build a Mansard loft conversion - £51,736

Loft conversion - £31,275

Build a kitchen extension - £41,736

Hip to gable loft conversion - £41,736

Granny annexe - £86,736

Garden office - £9,736

Convert a Garage - £15,736

Garage - £18,236

Build a flat roof extension - £21,736

Build a dormer loft conversion - £41,736

Concrete foundations - £5,986

Convert a bungalow loft - £28,736

Convert a basement - £34,530