From £51,432
WJ Builders is an established and experienced local extension builder in Gwynedd. Please contact us for a free, no obligation quote and competitive...
From £51,256
Building & Flat Roofing Contractors is a trusted extension builder serving customers in Gwynedd and the surrounding area. Contact us to today to ge...

Mansard loft conversions range from the cheapest installation of £51,256 (Building & Flat Roofing Contractors based in LL54) to the dearest of around £51,432 (WJ Builders based in LL53).
While these estimates give you a good idea how much you'll pay for a mansard loft conversion, the only way to get an accurate price is to get real quotes from real builders.
Get quotes to install a mansard loft conversion in Gwynedd by posting a job with HaMuch and we'll send it to extension builders in Gwynedd.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Mansard Loft Conversion near Conwy | £28 | £211 |
| Build A Mansard Loft Conversion near Conway | £28 | £211 |
| Build A Mansard Loft Conversion near Llandudno | £28 | £211 |
| Build A Mansard Loft Conversion near Colwyn Bay | £28 | £211 |
| Build A Mansard Loft Conversion near Rhyl | £28 | £209 |
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 - £16,844

Two storey extension - £87,016

Build a timber frame extension - £25,344

Build a swimming pool - £80,344

Single storey extension - £41,880

Side return extension - £34,120

Install an RSJ - £1,544

Outbuilding - £9,344

Build a Mansard loft conversion - £51,344

Loft conversion - £27,600

Build a kitchen extension - £41,344

Hip to gable loft conversion - £41,344

Granny annexe - £86,344

Garden office - £9,344

Convert a Garage - £15,344

Garage - £17,844

Build a flat roof extension - £21,344

Build a dormer loft conversion - £41,344

Concrete foundations - £5,594

Convert a bungalow loft - £28,344

Convert a basement - £30,120