From £17,076
CAMWOOD BUILDING SERVICES is an established extension buildering business in CF5. We come highly recommended and provide competitive quotes for you...
From £17,260
RDL BUILDING SERVICES LTD is a trusted extension builder serving customers in CF5 and the surrounding area. Contact us to today to get a competitiv...
From £17,308
CJ BUILDING SERVICES are here to help customers who need an Extension Builder in CF5. We offer a competitive rate to complete all your extension bu...
From £17,308
Experienced extension builder ready to quote for your work. Chapman Builders is the best extension builder in CF5. No obligation free quotes and ma...
From £17,260
Construction Jobs is an established and experienced local extension builder in CF5. Please contact us for a free, no obligation quote and competiti...
From £17,060
Member since June 2026
Trusted and professional extension builder in CF5. Experienced in all extension buildering work and keeping within budget and on quote. Elite Build...
From £17,100
MARWAY BUILDING LTD is a trusted extension builder serving customers in CF5 and the surrounding area. Contact us to today to get a competitive quot...
From £17,372
GRE BUILDING SERVICES is an established and experienced local extension builder in CF5. Please contact us for a free, no obligation quote and compe...
From £17,228
The Philog Paving Services is an established extension buildering business in CF5. We come highly recommended and provide competitive quotes for yo...
From £17,220
Vencer understand that when it comes to delivering client\nsatisfaction, the project or property involved will require\nbeing delivered on time, wi...

Underpinning ranges from £17,060 (Elite Building Contractors South Wales based in Cf5) to £17,372 (GRE BUILDING SERVICES based in CF5), 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 CF5 by posting a job with HaMuch and we will send it to extension builders in CF5.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cardiff | £35 | £219 |
| Underpin A Building near Penarth | £36 | £217 |
| Underpin A Building near Barry | £33 | £218 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Vale of Glamorgan | £29 | £217 |
| Underpin A Building near Rhondda | £31 | £206 |
| 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 - £17,219

Two storey extension - £87,579

Build a timber frame extension - £25,719

Build a swimming pool - £80,719

Single storey extension - £49,384

Side return extension - £38,341

Install an RSJ - £1,919

Outbuilding - £9,719

Build a Mansard loft conversion - £51,719

Loft conversion - £31,118

Build a kitchen extension - £41,719

Hip to gable loft conversion - £41,719

Granny annexe - £86,719

Garden office - £9,719

Convert a Garage - £15,719

Garage - £18,219

Build a flat roof extension - £21,719

Build a dormer loft conversion - £41,719

Concrete foundations - £5,969

Convert a bungalow loft - £28,719

Convert a basement - £34,341