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BRIARWOOD BUILDING CONTRS LTD is an established extension buildering business in Grantham. We come highly recommended and provide competitive quote...
From £21,272
Grantham, NG31
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,488
The Glass Box is a trusted extension builder serving customers in Grantham and the surrounding area. Contact us to today to get a competitive quote...

A flat roof extension ranges from the cheapest of £21,272 (LG Soffits & Fascias based in NG31) to the dearest of £21,568 (BRIARWOOD BUILDING CONTRS LTD based in NG32), 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 Grantham by posting a job with HaMuch. We'll send it to extension builders in Grantham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Grantham | £38 | £228 |
| Build A Flat Roof Extension near Newark-on-Trent | £33 | £241 |
| Build A Flat Roof Extension near Melton Mowbray | £31 | £222 |
| Build A Flat Roof Extension near Gedling | £33 | £242 |
| Build A Flat Roof Extension near Carlton | £33 | £242 |
| Build A Flat Roof Extension near Stamford | £35 | £248 |
| Build A Flat Roof Extension near West Bridgford | £33 | £245 |
| Build A Flat Roof Extension near Arnold | £35 | £244 |
| Build A Flat Roof Extension near Nottingham | £34 | £241 |
| Build A Flat Roof Extension near Spalding | £32 | £238 |
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 - £16,943

Two storey extension - £87,164

Build a timber frame extension - £25,443

Build a swimming pool - £80,443

Single storey extension - £43,853

Side return extension - £35,230

Install an RSJ - £1,643

Outbuilding - £9,443

Build a Mansard loft conversion - £51,443

Loft conversion - £28,525

Build a kitchen extension - £41,443

Hip to gable loft conversion - £41,443

Granny annexe - £86,443

Garden office - £9,443

Convert a Garage - £15,443

Garage - £17,943

Build a flat roof extension - £21,443

Build a dormer loft conversion - £41,443

Concrete foundations - £5,693

Convert a bungalow loft - £28,443

Convert a basement - £31,230