From £17,132
Relax... you have found a reliable extension builder in CF3. Charles Marshall Contracting Ltd is a friendly and reliable company based in CF3 who c...
From £17,468
Experienced extension builder ready to quote for your work. N OBRIEN BUILDING SERVICES is the best extension builder in CF3. No obligation free quo...
From £17,396
Need to find an Extension Builder near you for all your extension buildering work?
RIMO CONSTRUCTION provides a local, trusted extension bu...
From £16,884
I've been in the building trade for over thirty years. I do not advertise any where other than Facebook. I really totally on recomendations...
From £17,444
Smarta living Group is a trusted extension builder serving customers in CF3 and the surrounding area. Contact us to today to get a competitive quot...
From £17,452
HOUSE EXTENSION BUILDERS Covering Cardiff and Newport, United kingdom. Type of house extension we design and build:Single storey rear house extens...
From £17,220
Relax... you have found a reliable extension builder in CF3. MGKB Ltd is a friendly and reliable company based in CF3 who consider no job as too bi...
From £17,268
R. Hughes Designs is an established and experienced local extension builder in CF3. Please contact us for a free, no obligation quote and competiti...
From £17,132
TGF BUILDING & MAINTENCE is an established and experienced local extension builder in CF3. Please contact us for a free, no obligation quote and co...
From £17,084
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,884 (Griffin building contractors based in CF3) to £17,468 (N OBRIEN BUILDING SERVICES based in CF3), 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 CF3 by posting a job with HaMuch and we will send it to extension builders in CF3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cardiff | £35 | £219 |
| Underpin A Building near Caerphilly | £33 | £208 |
| Underpin A Building near Risca | £32 | £218 |
| Underpin A Building near Newport | £41 | £233 |
| Underpin A Building near Penarth | £36 | £217 |
| Underpin A Building near Church Village | £34 | £214 |
| Underpin A Building near Cwmbran | £43 | £219 |
| Underpin A Building near Pontypridd | £33 | £211 |
| Underpin A Building near Barry | £33 | £218 |
| Underpin A Building near Clevedon | £32 | £243 |
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 - £17,248

Two storey extension - £87,622

Build a timber frame extension - £25,748

Build a swimming pool - £80,748

Single storey extension - £49,960

Side return extension - £38,665

Install an RSJ - £1,948

Outbuilding - £9,748

Build a Mansard loft conversion - £51,748

Loft conversion - £31,388

Build a kitchen extension - £41,748

Hip to gable loft conversion - £41,748

Granny annexe - £86,748

Garden office - £9,748

Convert a Garage - £15,748

Garage - £18,248

Build a flat roof extension - £21,748

Build a dormer loft conversion - £41,748

Concrete foundations - £5,998

Convert a bungalow loft - £28,748

Convert a basement - £34,665