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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 £10,192
Need to find an Extension Builder near you for all your extension buildering work?
J FLANN BUILDING & MAINTENANCE provides a local, trusted...
From £10,032
Design Properties & Renovations is an established and experienced local extension builder in Portland. Please contact us for a free, no obligation ...
From £10,536
Our building services company Roofix and Build Ltd have twenty years experience of helping customers in Weymouth and the surrounding area by provid...
From £10,008
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 £10,144
Weymouth based property Investment and Re-development: Upcycling discarded materials to provide bespoke interior refurbishments, full property reno...
From £10,048
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 £10,016
Dorset Showhomes Ltd is an established extension buildering business in Portland. We come highly recommended and provide competitive quotes for you...
From £10,536
Chris Larner building services is a trusted extension builder serving customers in Portland and the surrounding area. Contact us to today to get a ...

Outbuilding costs in Portland range from the cheapest of £9,472 (WEYMOUTH ROOFING CO. based in DT4) to the dearest of £10,536 (Roofix and Build Ltd based in DT4), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in Portland by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Weymouth | £33 | £260 |
| Outbuilding near Dorchester | £30 | £230 |
| Outbuilding near Poole | £38 | £250 |
| Outbuilding near Bournemouth | £38 | £257 |
| Outbuilding 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