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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...
, LL28
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...
Need an Extension Builder in Colwyn Bay? Chris's Roofing & Property Maintenance has been helping local clients (20 mile radius) with their extensio...
Robert Wilson
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
John Foster
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...

Underpinning ranges from £16,916 (Octagon Construction Ltd based in LL18) to £17,332 (Wood floor services 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 - £17,116

Two storey extension - £87,424

Build a timber frame extension - £25,616

Build a swimming pool - £80,616

Single storey extension - £47,320

Side return extension - £37,180

Install an RSJ - £1,816

Outbuilding - £9,616

Build a Mansard loft conversion - £51,616

Loft conversion - £30,150

Build a kitchen extension - £41,616

Hip to gable loft conversion - £41,616

Granny annexe - £86,616

Garden office - £9,616

Convert a Garage - £15,616

Garage - £18,116

Build a flat roof extension - £21,616

Build a dormer loft conversion - £41,616

Concrete foundations - £5,866

Convert a bungalow loft - £28,616

Convert a basement - £33,180