From £22,008
We are a family run business with 20 years experience.
We take great care and attention to the work we carry out and pride ourselves on ...
From £21,992
Need to find an Extension Builder near you for all your extension buildering work?
A B Building Roofing Services provides a local, trusted ...
From £21,968
Relax... you have found a reliable extension builder in S40. CS Construction & Conversions is a friendly and reliable company based in S40 who cons...
From £21,000
Honest, reliable, experienced building/civil engineering contractor established in 2001.
From £21,760
RMS Building Services is a trusted extension builder serving customers in S40 and the surrounding area. Contact us to today to get a competitive qu...
From £21,936
Trusted and professional extension builder in S40. Experienced in all extension buildering work and keeping within budget and on quote. Merebrook C...
From £21,936
Dore Decor are a family run business with over 30 years experience - we offer an extensive range of building services and are able to provide a ful...
From £22,112
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £22,344
Trusted and professional extension builder in S40. Experienced in all extension buildering work and keeping within budget and on quote. AMB Joinery...

A flat roof extension ranges from the cheapest of £21,000 (HUSKINSON CONSTR SRVCS LTD based in NG16) to the dearest of £22,344 (AMB Joinery & Building Services based in S8), 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 S40 by posting a job with HaMuch. We'll send it to extension builders in S40.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Chesterfield | £33 | £257 |
| Build A Flat Roof Extension near Dronfield | £33 | £262 |
| Build A Flat Roof Extension near Alfreton | £34 | £261 |
| Build A Flat Roof Extension near Sheffield | £32 | £261 |
| Build A Flat Roof Extension near Sutton-in-Ashfield | £33 | £265 |
| Build A Flat Roof Extension near Mansfield Woodhouse | £33 | £263 |
| Build A Flat Roof Extension near Kirkby-in-Ashfield | £34 | £270 |
| Build A Flat Roof Extension near Ashfield | £34 | £270 |
| Build A Flat Roof Extension near Mansfield | £33 | £262 |
| Build A Flat Roof Extension near Worksop | £33 | £265 |
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 - £17,334

Two storey extension - £87,752

Build a timber frame extension - £25,834

Build a swimming pool - £80,834

Single storey extension - £51,688

Side return extension - £39,637

Install an RSJ - £2,034

Outbuilding - £9,834

Build a Mansard loft conversion - £51,834

Loft conversion - £32,198

Build a kitchen extension - £41,834

Hip to gable loft conversion - £41,834

Granny annexe - £86,834

Garden office - £9,834

Convert a Garage - £15,834

Garage - £18,334

Build a flat roof extension - £21,834

Build a dormer loft conversion - £41,834

Concrete foundations - £6,084

Convert a bungalow loft - £28,834

Convert a basement - £35,637