From £21,856
Firestone Surfacing Ltd is a trusted extension builder serving customers in DT1 and the surrounding area. Contact us to today to get a competitive ...
From £21,472
WEYMOUTH ROOFING CO. is an established and experienced local extension builder in DT1. Please contact us for a free, no obligation quote and compet...
From £22,184
Experienced extension builder ready to quote for your work. WILD CONSTRUCTION LTD is the best extension builder in DT1. No obligation free quotes a...
From £21,200
MARLEY TRained roofer, reliable ,flat roofs , slating and tiling,fascias and gutters. All repairs, no job too small
From £22,064
Need an Extension Builder in DT1? D&B Build has been helping local clients (20 mile radius) with their extension buildering jobs for many years. Ge...
From £22,120
Ground Up Building Services Ltd is a trusted extension builder serving customers in DT1 and the surrounding area. Contact us to today to get a comp...
From £21,792
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,792
M & J CONSTRUCTION is an established extension buildering business in DT1. We come highly recommended and provide competitive quotes for your work....
From £22,192
Need to find an Extension Builder near you for all your extension buildering work?
J FLANN BUILDING & MAINTENANCE provides a local, trusted...
From £22,400
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

A flat roof extension ranges from the cheapest of £21,200 (GMD Roofing based in BH15) to the dearest of £22,400 (Ed Bartlett Building Contractor based in DT9), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in DT1 by posting a job with HaMuch. We'll send it to extension builders in DT1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Dorchester | £30 | £230 |
| Build A Flat Roof Extension near Weymouth | £33 | £260 |
| Build A Flat Roof Extension near Yeovil | £34 | £294 |
| Build A Flat Roof Extension near Poole | £38 | £250 |
| Build A Flat Roof Extension near South Somerset | £62 | £270 |
| Build A Flat Roof Extension near Bournemouth | £38 | £257 |
| Build A Flat Roof Extension near Taunton | £31 | £242 |
| Build A Flat Roof Extension near Salisbury | £35 | £247 |
| Build A Flat Roof Extension near Bridgwater | £30 | £236 |
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 - £17,407

Two storey extension - £87,861

Build a timber frame extension - £25,907

Build a swimming pool - £80,907

Single storey extension - £53,144

Side return extension - £40,456

Install an RSJ - £2,107

Outbuilding - £9,907

Build a Mansard loft conversion - £51,907

Loft conversion - £32,880

Build a kitchen extension - £41,907

Hip to gable loft conversion - £41,907

Granny annexe - £86,907

Garden office - £9,907

Convert a Garage - £15,907

Garage - £18,407

Build a flat roof extension - £21,907

Build a dormer loft conversion - £41,907

Concrete foundations - £6,157

Convert a bungalow loft - £28,907

Convert a basement - £36,456