From £51,664
Need an Extension Builder in St Helens? KMC Brickwork has been helping local clients (20 mile radius) with their extension buildering jobs for many...
From £51,608
Trusted and professional extension builder in St Helens. Experienced in all extension buildering work and keeping within budget and on quote. M L R...
From £51,872
G. Finnigan Builders is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for yo...
From £51,880
Need to find an Extension Builder near you for all your extension buildering work?
Leabra Construction North West Ltd provides a local, tru...
From £51,224
MJ Barker & Son is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for your wo...
From £52,032
Hello, I am Allan. I have run Allan Rowe Property Services since September 2014. I am based in Newton Le Willows and provide a wide range of proper...
From £51,896
HIGHTOWN CONSTRUCTION LTD is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes f...
From £51,800
Higher End Construction Limited is an established extension buildering business in St Helens. We come highly recommended and provide competitive qu...
From £51,864
Need to find an Extension Builder near you for all your extension buildering work?
Maintenance Point provides a local, trusted extension bu...
From £51,824
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Mansard loft conversions range from the cheapest installation of £51,224 (MJ Barker & Son based in WA11) to the dearest of around £52,032 (Allan Rowe Property Services based in WA12).
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 St Helens by posting a job with HaMuch and we'll send it to extension builders in St Helens.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Mansard Loft Conversion near St Helens | £31 | £224 |
| Build A Mansard Loft Conversion near Prescot | £31 | £223 |
| Build A Mansard Loft Conversion near Knowsley | £31 | £222 |
| Build A Mansard Loft Conversion near Newton-le-Willows | £31 | £221 |
| Build A Mansard Loft Conversion near Huyton with Roby | £31 | £225 |
| Build A Mansard Loft Conversion near Ashton-in-Makerfield | £30 | £220 |
| Build A Mansard Loft Conversion near Widnes | £31 | £220 |
| Build A Mansard Loft Conversion near Golborne | £30 | £222 |
| Build A Mansard Loft Conversion near Orrell | £29 | £214 |
| Build A Mansard Loft Conversion near Kirkby | £31 | £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 - £17,266

Two storey extension - £87,650

Build a timber frame extension - £25,766

Build a swimming pool - £80,766

Single storey extension - £50,328

Side return extension - £38,872

Install an RSJ - £1,966

Outbuilding - £9,766

Build a Mansard loft conversion - £51,766

Loft conversion - £31,560

Build a kitchen extension - £41,766

Hip to gable loft conversion - £41,766

Granny annexe - £86,766

Garden office - £9,766

Convert a Garage - £15,766

Garage - £18,266

Build a flat roof extension - £21,766

Build a dormer loft conversion - £41,766

Concrete foundations - £6,016

Convert a bungalow loft - £28,766

Convert a basement - £34,872