From £17,116
Need to find an Extension Builder near you for all your extension buildering work?
Max Sandford & San provides a local, trusted extension b...
From £17,076
Need to find an Extension Builder near you for all your extension buildering work?
G.I Davies & Son provides a local, trusted extension bui...
From £17,292
Shane Griffiths & Son Ltd is a trusted extension builder serving customers in Crymych and the surrounding area. Contact us to today to get a compet...
From £16,796
Hi my name is Deri
I'm a friendly and reliable and have over 20 yes experience in the building trade. And also come from a family backgr...
From £17,236
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,820
Relax... you have found a reliable extension builder in Crymych. D&O Construction Ltd is a friendly and reliable company based in Crymych who consi...
From £16,932
Relax... you have found a reliable extension builder in Crymych. Norton Construction is a friendly and reliable company based in Crymych who consid...
From £17,436
Need to find an Extension Builder near you for all your extension buildering work?
N Morgans & Son Ltd provides a local, trusted extension ...

Underpinning ranges from £16,796 (DERI BROWN T/A D Brown Building Services based in SA44) to £17,436 (N Morgans & Son Ltd based in SA33), 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 Crymych by posting a job with HaMuch and we will send it to extension builders in Crymych.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Carmarthenshire | £26 | £205 |
| Underpin A Building near Carmarthen | £26 | £205 |
| Underpin A Building near Pembrokeshire | £19 | £163 |
| Underpin A Building near Milford Haven | £18 | £159 |
| Underpin A Building near Llanelli | £29 | £231 |
| Underpin A Building near Gorseinon | £29 | £228 |
| Underpin A Building near Swansea | £29 | £230 |
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 - £17,088

Two storey extension - £87,382

Build a timber frame extension - £25,588

Build a swimming pool - £80,588

Single storey extension - £46,760

Side return extension - £36,865

Install an RSJ - £1,788

Outbuilding - £9,588

Build a Mansard loft conversion - £51,588

Loft conversion - £29,888

Build a kitchen extension - £41,588

Hip to gable loft conversion - £41,588

Granny annexe - £86,588

Garden office - £9,588

Convert a Garage - £15,588

Garage - £18,088

Build a flat roof extension - £21,588

Build a dormer loft conversion - £41,588

Concrete foundations - £5,838

Convert a bungalow loft - £28,588

Convert a basement - £32,865