From £16,756
Building & Flat Roofing Contractors is a trusted extension builder serving customers in Penrhyndeudraeth and the surrounding area. Contact us to to...
From £16,932
WJ Builders is an established and experienced local extension builder in Penrhyndeudraeth. Please contact us for a free, no obligation quote and co...
From £17,220
Need an Extension Builder in Penrhyndeudraeth? Hughes Construction has been helping local clients (20 mile radius) with their extension buildering ...

Underpinning ranges from £16,756 (Building & Flat Roofing Contractors based in LL54) to £17,220 (Hughes Construction based in LL57), 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 Penrhyndeudraeth by posting a job with HaMuch and we will send it to extension builders in Penrhyndeudraeth.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Conwy | £28 | £211 |
| Underpin A Building near Conway | £28 | £211 |
| Underpin A Building near Llandudno | £28 | £211 |
| Underpin A Building near Colwyn Bay | £28 | £211 |
| Underpin A Building near Rhyl | £28 | £209 |
| Underpin A Building near Prestatyn | £29 | £213 |
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 - £16,969

Two storey extension - £87,204

Build a timber frame extension - £25,469

Build a swimming pool - £80,469

Single storey extension - £44,387

Side return extension - £35,530

Install an RSJ - £1,669

Outbuilding - £9,469

Build a Mansard loft conversion - £51,469

Loft conversion - £28,775

Build a kitchen extension - £41,469

Hip to gable loft conversion - £41,469

Granny annexe - £86,469

Garden office - £9,469

Convert a Garage - £15,469

Garage - £17,969

Build a flat roof extension - £21,469

Build a dormer loft conversion - £41,469

Concrete foundations - £5,719

Convert a bungalow loft - £28,469

Convert a basement - £31,530