From £17,012
AK Enterprise (GB) Limited is an established extension buildering business in Glamorgan. We come highly recommended and provide competitive quotes ...
From £17,116
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in Glamorgan. No obligation free ...
From £17,196
Experienced extension builder ready to quote for your work. Studio369 is the best extension builder in Glamorgan. No obligation free quotes and man...
From £17,532
, CF24
Need to find an Extension Builder near you for all your extension buildering work?
Heath Windows & Doors Ltd provides a local, trusted exte...
From £17,292
MCp Home Improvements is an established and experienced local extension builder in Glamorgan. Please contact us for a free, no obligation quote and...
From £17,284
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in Glamorgan. No obligation free quotes and man...
From £17,148
Experienced extension builder ready to quote for your work. Charles James Developments is the best extension builder in Glamorgan. No obligation fr...
From £17,348
Need to find an Extension Builder near you for all your extension buildering work?
HECTOR CONSTRUCTION provides a local, trusted extension ...
From £16,996
Trusted and professional extension builder in Glamorgan. Experienced in all extension buildering work and keeping within budget and on quote. TGH &...
From £17,124
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,996 (TGH & Sons based in cf23) to £17,532 (Heath Windows & Doors Ltd based in CF24), 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 Glamorgan by posting a job with HaMuch and we will send it to extension builders in Glamorgan.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cardiff | £30 | £190 |
| Underpin A Building near Penarth | £31 | £189 |
| Underpin A Building near Barry | £29 | £189 |
| Underpin A Building near Caerphilly | £29 | £181 |
| Underpin A Building near Church Village | £30 | £188 |
| Underpin A Building near Risca | £27 | £185 |
| Underpin A Building near Newport | £37 | £200 |
| Underpin A Building near Pontypridd | £29 | £184 |
| Underpin A Building near Weston-super-Mare | £29 | £216 |
| Underpin A Building near Cwmbran | £39 | £190 |
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 - £17,205

Two storey extension - £87,557

Build a timber frame extension - £25,705

Build a swimming pool - £80,705

Single storey extension - £49,096

Side return extension - £38,179

Install an RSJ - £1,905

Outbuilding - £9,705

Build a Mansard loft conversion - £51,705

Loft conversion - £30,983

Build a kitchen extension - £41,705

Hip to gable loft conversion - £41,705

Granny annexe - £86,705

Garden office - £9,705

Convert a Garage - £15,705

Garage - £18,205

Build a flat roof extension - £21,705

Build a dormer loft conversion - £41,705

Concrete foundations - £5,955

Convert a bungalow loft - £28,705

Convert a basement - £34,179