From £17,300
Need an Extension Builder in Trefriw? Chris's Roofing & Property Maintenance has been helping local clients (20 mile radius) with their extension b...
From £17,076
, LL28
Relax... you have found a reliable extension builder in Trefriw. UK Leisure Living Ltd is a friendly and reliable company based in Trefriw who cons...
From £17,228
Need to find an Extension Builder near you for all your extension buildering work?
W F CLAYTON & CO LTD provides a local, trusted extension...
From £17,220
Need an Extension Builder in Trefriw? Hughes Construction has been helping local clients (20 mile radius) with their extension buildering jobs for ...
From £16,956
S ROBERTS ROOFING are here to help customers who need an Extension Builder in Trefriw. We offer a competitive rate to complete all your extension b...
From £16,916
Octagon Construction Ltd is a trusted extension builder serving customers in Trefriw and the surrounding area. Contact us to today to get a competi...
From £17,332
Wood floor services is a trusted extension builder serving customers in Trefriw and the surrounding area. Contact us to today to get a competitive...
From £17,372
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,244
Fiting of door internal/external All joinery work from new joists to fitting off skirting boards Kitchen fitting Staircase or replac...
From £16,756
Building & Flat Roofing Contractors is a trusted extension builder serving customers in Trefriw and the surrounding area. Contact us to today to ge...

Underpinning ranges from £16,756 (Building & Flat Roofing Contractors based in LL54) to £17,372 (Brothers Construction based in LL18), 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 Trefriw by posting a job with HaMuch and we will send it to extension builders in Trefriw.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Conwy | £24 | £184 |
| Underpin A Building near Conway | £24 | £184 |
| Underpin A Building near Colwyn Bay | £24 | £184 |
| Underpin A Building near Llandudno | £24 | £184 |
| Underpin A Building near Rhyl | £24 | £178 |
| Underpin A Building near Prestatyn | £24 | £179 |
| Underpin A Building near Flintshire | £28 | £191 |
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 - £17,140

Two storey extension - £87,460

Build a timber frame extension - £25,640

Build a swimming pool - £80,640

Single storey extension - £47,800

Side return extension - £37,450

Install an RSJ - £1,840

Outbuilding - £9,640

Build a Mansard loft conversion - £51,640

Loft conversion - £30,375

Build a kitchen extension - £41,640

Hip to gable loft conversion - £41,640

Granny annexe - £86,640

Garden office - £9,640

Convert a Garage - £15,640

Garage - £18,140

Build a flat roof extension - £21,640

Build a dormer loft conversion - £41,640

Concrete foundations - £5,890

Convert a bungalow loft - £28,640

Convert a basement - £33,450