From £51,496
Trusted and professional extension builder in Portstewart. Experienced in all extension buildering work and keeping within budget and on quote. pur...
From £51,608
Need an Extension Builder in Portstewart? SF Carpentry has been helping local clients (20 mile radius) with their extension buildering jobs for man...
From £51,520
Luxury Garden Studios is an established and experienced local extension builder in Portstewart. Please contact us for a free, no obligation quote a...

Mansard loft conversions range from the cheapest installation of £51,496 (Purdy build based in bt53) to the dearest of around £51,608 (SF Carpentry based in BT51).
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 Portstewart by posting a job with HaMuch and we'll send it to extension builders in Portstewart.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Mansard Loft Conversion near Coleraine | £23 | £201 |
| Build A Mansard Loft Conversion near Ballymoney | £21 | £187 |
| Build A Mansard Loft Conversion near Dungiven | £22 | £190 |
| Build A Mansard Loft Conversion near Strathfoyle | £24 | £190 |
| Build A Mansard Loft Conversion near Londonderry | £24 | £190 |
| Build A Mansard Loft Conversion near Magherafelt | £30 | £238 |
| Build A Mansard Loft Conversion near Newbuildings | £24 | £190 |
| Build A Mansard Loft Conversion near Strabane | £27 | £223 |
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 - £17,041

Two storey extension - £87,312

Build a timber frame extension - £25,541

Build a swimming pool - £80,541

Single storey extension - £45,827

Side return extension - £36,340

Install an RSJ - £1,741

Outbuilding - £9,541

Build a Mansard loft conversion - £51,541

Loft conversion - £29,450

Build a kitchen extension - £41,541

Hip to gable loft conversion - £41,541

Granny annexe - £86,541

Garden office - £9,541

Convert a Garage - £15,541

Garage - £18,041

Build a flat roof extension - £21,541

Build a dormer loft conversion - £41,541

Concrete foundations - £5,791

Convert a bungalow loft - £28,541

Convert a basement - £32,340