From £21,616
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in CF10. No obligation free quote...
From £21,696
Experienced extension builder ready to quote for your work. Studio369 is the best extension builder in CF10. No obligation free quotes and many hap...
From £22,032
Need to find an Extension Builder near you for all your extension buildering work?
Heath Windows & Doors Ltd provides a local, trusted exte...
From £21,792
MCp Home Improvements is an established and experienced local extension builder in CF10. Please contact us for a free, no obligation quote and comp...
From £21,784
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in CF10. No obligation free quotes and many hap...
From £21,648
Experienced extension builder ready to quote for your work. Charles James Developments is the best extension builder in CF10. No obligation free qu...
From £21,848
Need to find an Extension Builder near you for all your extension buildering work?
HECTOR CONSTRUCTION provides a local, trusted extension ...
From £21,496
Trusted and professional extension builder in CF10. Experienced in all extension buildering work and keeping within budget and on quote. TGH & Sons...
From £21,624
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,896
River Gods is a respected name in bathroom and kitchen design throughout South Wales. Known for quality, artisan-ship and exceptional value for mon...

A flat roof extension ranges from the cheapest of £21,496 (TGH & Sons based in cf23) to the dearest of £22,032 (Heath Windows & Doors Ltd based in CF24), 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 CF10 by posting a job with HaMuch. We'll send it to extension builders in CF10.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Cardiff | £35 | £219 |
| Build A Flat Roof Extension near Penarth | £36 | £217 |
| Build A Flat Roof Extension near Barry | £33 | £218 |
| Build A Flat Roof Extension near Caerphilly | £33 | £208 |
| Build A Flat Roof Extension near Church Village | £34 | £214 |
| Build A Flat Roof Extension near Risca | £32 | £218 |
| Build A Flat Roof Extension near Newport | £41 | £233 |
| Build A Flat Roof Extension near Pontypridd | £33 | £211 |
| Build A Flat Roof Extension near Weston-super-Mare | £33 | £253 |
| Build A Flat Roof Extension near Cwmbran | £43 | £219 |
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 - £17,243

Two storey extension - £87,615

Build a timber frame extension - £25,743

Build a swimming pool - £80,743

Single storey extension - £49,864

Side return extension - £38,611

Install an RSJ - £1,943

Outbuilding - £9,743

Build a Mansard loft conversion - £51,743

Loft conversion - £31,343

Build a kitchen extension - £41,743

Hip to gable loft conversion - £41,743

Granny annexe - £86,743

Garden office - £9,743

Convert a Garage - £15,743

Garage - £18,243

Build a flat roof extension - £21,743

Build a dormer loft conversion - £41,743

Concrete foundations - £5,993

Convert a bungalow loft - £28,743

Convert a basement - £34,611