From £16,700
35 years in the trade and there is not much we haven't come across or done from pools to extensions and we specialise in loft conversions
From £17,412
ADVANCED BUILDING CONTRACTORS are here to help customers who need an Extension Builder in CF64. We offer a competitive rate to complete all your ex...
From £17,196
Experienced extension builder ready to quote for your work. Studio369 is the best extension builder in CF64. No obligation free quotes and many hap...
From £17,116
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in CF64. No obligation free quote...
From £16,956
Need to find an Extension Builder near you for all your extension buildering work?
Future Ideal Homes Ltd -Independent Network Installer pr...
From £17,148
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,532
Need to find an Extension Builder near you for all your extension buildering work?
Heath Windows & Doors Ltd provides a local, trusted exte...
From £17,084
Relax... you have found a reliable extension builder in CF64. DPC BUILDERS is a friendly and reliable company based in CF64 who consider no job as ...
From £17,308
CJ BUILDING SERVICES are here to help customers who need an Extension Builder in CF64. We offer a competitive rate to complete all your extension b...
From £17,076
CAMWOOD BUILDING SERVICES is an established extension buildering business in CF64. We come highly recommended and provide competitive quotes for yo...

Underpinning ranges from £16,700 (Penarth Loft Conversions Ltd based in CF64) 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 CF64 by posting a job with HaMuch and we will send it to extension builders in CF64.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Penarth | £36 | £217 |
| Underpin A Building near Cardiff | £35 | £219 |
| 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 Weston-super-Mare | £33 | £253 |
| Underpin A Building near Vale of Glamorgan | £29 | £217 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Newport | £41 | £233 |
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 - £17,153

Two storey extension - £87,479

Build a timber frame extension - £25,653

Build a swimming pool - £80,653

Single storey extension - £48,056

Side return extension - £37,594

Install an RSJ - £1,853

Outbuilding - £9,653

Build a Mansard loft conversion - £51,653

Loft conversion - £30,495

Build a kitchen extension - £41,653

Hip to gable loft conversion - £41,653

Granny annexe - £86,653

Garden office - £9,653

Convert a Garage - £15,653

Garage - £18,153

Build a flat roof extension - £21,653

Build a dormer loft conversion - £41,653

Concrete foundations - £5,903

Convert a bungalow loft - £28,653

Convert a basement - £33,594