A Thompson Joinery & Building is a trusted extension builder serving customers in NG21 and the surrounding area. Contact us to today to get a compe...
Need an Extension Builder in NG21? BRS BUILDERS has been helping local clients (20 mile radius) with their extension buildering jobs for many years...
Need to find an Extension Builder near you for all your extension buildering work?
Dave Tideswell Builder Renovations provides a local, tru...
From £21,992
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,896
Deanestor Limited is an established extension buildering business in NG21. We come highly recommended and provide competitive quotes for your work....

A flat roof extension ranges from the cheapest of £21,896 (Deanestor Limited based in NG19) to the dearest of £22,176 (A Thompson Joinery & Building based in NG18), 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 NG21 by posting a job with HaMuch. We'll send it to extension builders in NG21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Forest Town | £33 | £262 |
| Build A Flat Roof Extension near Mansfield | £33 | £261 |
| Build A Flat Roof Extension near Mansfield Woodhouse | £33 | £262 |
| Build A Flat Roof Extension near Sutton-in-Ashfield | £33 | £264 |
| Build A Flat Roof Extension near Kirkby-in-Ashfield | £34 | £269 |
| Build A Flat Roof Extension near Ashfield | £34 | £269 |
| Build A Flat Roof Extension near Hucknall | £35 | £258 |
| Build A Flat Roof Extension near Arnold | £35 | £244 |
| Build A Flat Roof Extension near Worksop | £33 | £265 |
| Build A Flat Roof Extension near Alfreton | £34 | £261 |
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 - £17,490

Two storey extension - £87,986

Build a timber frame extension - £25,990

Build a swimming pool - £80,990

Single storey extension - £54,808

Side return extension - £41,392

Install an RSJ - £2,190

Outbuilding - £9,990

Build a Mansard loft conversion - £51,990

Loft conversion - £33,660

Build a kitchen extension - £41,990

Hip to gable loft conversion - £41,990

Granny annexe - £86,990

Garden office - £9,990

Convert a Garage - £15,990

Garage - £18,490

Build a flat roof extension - £21,990

Build a dormer loft conversion - £41,990

Concrete foundations - £6,240

Convert a bungalow loft - £28,990

Convert a basement - £37,392