Extension builder estimates (based on hourly rates) to build a single storey extension in Gwynedd
Range from the cheapest single storey extension £31600 (Building & Flat Roofing Contractors based in LL54) to the dearest single storey extension £40080 (Bryn Pritchard Ltd - Building Contractors based in LL51).
Comparing extension builders estimates for fitting a downstairs toilet gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to build a single storey extension in Gwynedd by posting a job with HaMuch and we will send it to extension builders in Gwynedd.
Estimates for common extension builder jobs in Gwynedd;
| Job | Estimate |
| Underpinning a house | £16726 |
| Build a two storey extension | £86839 |
| Build a timber frame extension | £25226 |
| Install a swimming pool | £80226 |
| Cost to build a single storey extension | £34520 |
| Cost to build a side return extension | £28793 |
| Install an RSJ | £1426 |
| Build an outbuilding | £9226 |
| Build a mansard loft conversion | £51226 |
| Cost of a loft conversion | £26494 |
| Build a kitchen extension | £41226 |
| Build a hip to gable loft conversion | £41226 |
| Build a granny annexe | £86226 |
| Build a garden office | £9226 |
| Convert a garage | £15226 |
| Build a flat roof extension | £21226 |
| Build a dormer loft conversion | £41226 |
| Lay a concrete foundation | £5476 |
| Convert a bungalow loft | £28226 |
| Basement conversion cost | £28793 |
Rates for other Gwynedd trades
Extension Builders in Gwynedd
| Business name | Single storey extension cost |
|---|---|
| Bryn Pritchard Ltd - Building Contractors, Garndolbenmaen, LL51 | £40080 |
| WJ Builders, Pwllheli, LL53 | £32400 |
| W A Mitchell, Caernarfon, LL54 | £34000 |
| Building & Flat Roofing Contractors, Caernarfon, LL54 | £31600 |