From £17,076
Relax... you have found a reliable extension builder in Colwyn Bay. UK Leisure Living Ltd is a friendly and reliable company based in Colwyn Bay wh...
From £17,300
Need an Extension Builder in Colwyn Bay? Chris's Roofing & Property Maintenance has been helping local clients (20 mile radius) with their extensio...
From £16,956
S ROBERTS ROOFING are here to help customers who need an Extension Builder in Colwyn Bay. We offer a competitive rate to complete all your extensio...
From £17,332
Wood floor services is a trusted extension builder serving customers in Colwyn Bay and the surrounding area. Contact us to today to get a competit...
From £16,916
Octagon Construction Ltd is a trusted extension builder serving customers in Colwyn Bay and the surrounding area. Contact us to today to get a comp...
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 £16,948
We are a company with over 30 years of experience. Who pride ourselves by providing a honest reliable service
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 Colwyn Bay? Hughes Construction has been helping local clients (20 mile radius) with their extension buildering jobs f...

Underpinning ranges from £16,916 (Octagon Construction Ltd based in LL18) 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 Colwyn Bay by posting a job with HaMuch and we will send it to extension builders in Colwyn Bay.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Colwyn Bay | £28 | £211 |
| Underpin A Building near Llandudno | £28 | £211 |
| Underpin A Building near Conway | £28 | £211 |
| Underpin A Building near Conwy | £28 | £211 |
| Underpin A Building near Rhyl | £28 | £209 |
| Underpin A Building near Prestatyn | £29 | £213 |
| Underpin A Building near Flintshire | £33 | £224 |
| Underpin A Building near Heswall | £30 | £213 |
| Underpin A Building near Wirral | £31 | £219 |
| Underpin A Building near Connah's Quay | £33 | £229 |
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 - £17,150

Two storey extension - £87,475

Build a timber frame extension - £25,650

Build a swimming pool - £80,650

Single storey extension - £47,996

Side return extension - £37,560

Install an RSJ - £1,850

Outbuilding - £9,650

Build a Mansard loft conversion - £51,650

Loft conversion - £30,467

Build a kitchen extension - £41,650

Hip to gable loft conversion - £41,650

Granny annexe - £86,650

Garden office - £9,650

Convert a Garage - £15,650

Garage - £18,150

Build a flat roof extension - £21,650

Build a dormer loft conversion - £41,650

Concrete foundations - £5,900

Convert a bungalow loft - £28,650

Convert a basement - £33,560