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Select your affordable Portland extension builder
Portland, DT5
D WHYTON BUILDING SERVICES LTD is a trusted extension builder serving customers in Portland and the surrounding area. Contact us to today to get a ...
WEYMOUTH ROOFING CO. is an established and experienced local extension builder in Portland. Please contact us for a free, no obligation quote and c...
From £52,192
Need to find an Extension Builder near you for all your extension buildering work?
J FLANN BUILDING & MAINTENANCE provides a local, trusted...
From £52,032
Design Properties & Renovations is an established and experienced local extension builder in Portland. Please contact us for a free, no obligation ...
From £52,536
Our building services company Roofix and Build Ltd have twenty years experience of helping customers in Weymouth and the surrounding area by provid...
From £52,008
We are a small business priding oueselves on high quality works carried out with care and attention. We use a select few subcontractors to help com...
From £52,144
Weymouth based property Investment and Re-development: Upcycling discarded materials to provide bespoke interior refurbishments, full property reno...
From £52,048
Danny McGrady
DM Building & Property Maintenance is a trusted extension builder serving customers in Portland and the surrounding area. Contact us to today to ge...
From £52,016
Dorset Showhomes Ltd is an established extension buildering business in Portland. We come highly recommended and provide competitive quotes for you...
From £52,536
Chris Larner building services is a trusted extension builder serving customers in Portland and the surrounding area. Contact us to today to get a ...

Mansard loft conversions range from the cheapest installation of £51,472 (WEYMOUTH ROOFING CO. based in DT4) to the dearest of around £52,536 (Roofix and Build Ltd based in DT4).
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 Portland by posting a job with HaMuch and we'll send it to extension builders in Portland.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Mansard Loft Conversion near Weymouth | £33 | £260 |
| Build A Mansard Loft Conversion near Dorchester | £30 | £230 |
| Build A Mansard Loft Conversion near Poole | £38 | £250 |
| Build A Mansard Loft Conversion near Bournemouth | £38 | £257 |
| Build A Mansard Loft Conversion near Yeovil | £34 | £294 |
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 - £17,606

Two storey extension - £88,160

Build a timber frame extension - £26,106

Build a swimming pool - £81,106

Single storey extension - £57,128

Side return extension - £42,697

Install an RSJ - £2,306

Outbuilding - £10,106

Build a Mansard loft conversion - £52,106

Loft conversion - £34,748

Build a kitchen extension - £42,106

Hip to gable loft conversion - £42,106

Granny annexe - £87,106

Garden office - £10,106

Convert a Garage - £16,106

Garage - £18,606

Build a flat roof extension - £22,106

Build a dormer loft conversion - £42,106

Concrete foundations - £6,356

Convert a bungalow loft - £29,106

Convert a basement - £38,697