From £16,548
Need to find an Extension Builder near you for all your extension buildering work?
P K BUILDING provides a local, trusted extension builder...
From £17,116
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in CF11. No obligation free quote...
From £17,228
Neil Causon & Son is an established and experienced local extension builder in CF11. Please contact us for a free, no obligation quote and competit...
From £18,236
An experienced quality tradesman who is a member of the federation of master builders.
Any projects will be undertaken safely, professio...
From £17,284
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in CF11. No obligation free quotes and many hap...
From £17,540
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,340
MOORLAND DESIGN & BUILD LTD are here to help customers who need an Extension Builder in CF11. We offer a competitive rate to complete all your exte...
From £17,292
T Porter Buiding is an established and experienced local extension builder in CF11. Please contact us for a free, no obligation quote and competiti...
From £17,132
Relax... you have found a reliable extension builder in CF11. Charles Marshall Contracting Ltd is a friendly and reliable company based in CF11 who...
From £16,700
Very reliable honest and hard working guarantee all work clean and tidy first class work

Underpinning ranges from £16,548 (P K BUILDING based in TA8) to £18,236 (WMP Builders based in TA9), 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 CF11 by posting a job with HaMuch and we will send it to extension builders in CF11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cardiff | £34 | £219 |
| Underpin A Building near Penarth | £35 | £218 |
| Underpin A Building near Barry | £33 | £218 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Newport | £41 | £233 |
| Underpin A Building near Vale of Glamorgan | £29 | £217 |
| Underpin A Building near Weston-super-Mare | £33 | £253 |
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 - £17,242

Two storey extension - £87,612

Build a timber frame extension - £25,742

Build a swimming pool - £80,742

Single storey extension - £49,832

Side return extension - £38,593

Install an RSJ - £1,942

Outbuilding - £9,742

Build a Mansard loft conversion - £51,742

Loft conversion - £31,328

Build a kitchen extension - £41,742

Hip to gable loft conversion - £41,742

Granny annexe - £86,742

Garden office - £9,742

Convert a Garage - £15,742

Garage - £18,242

Build a flat roof extension - £21,742

Build a dormer loft conversion - £41,742

Concrete foundations - £5,992

Convert a bungalow loft - £28,742

Convert a basement - £34,593