From £21,696
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A flat roof extension ranges from the cheapest of £21,696 (Toni build ltd based in RM10) to the dearest of £21,696 (Toni build ltd based in RM10), 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 Thornhill by posting a job with HaMuch. We'll send it to extension builders in Thornhill.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Dumfries & Galloway | £20 | £164 |
| Build A Flat Roof Extension near Dumfries | £20 | £164 |
| Build A Flat Roof Extension near Kilmarnock | £36 | £271 |
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 - £17,196

Two storey extension - £87,544

Build a timber frame extension - £25,696

Build a swimming pool - £80,696

Single storey extension - £48,920

Side return extension - £38,080

Install an RSJ - £1,896

Outbuilding - £9,696

Build a Mansard loft conversion - £51,696

Loft conversion - £30,900

Build a kitchen extension - £41,696

Hip to gable loft conversion - £41,696

Granny annexe - £86,696

Garden office - £9,696

Convert a Garage - £15,696

Garage - £18,196

Build a flat roof extension - £21,696

Build a dormer loft conversion - £41,696

Concrete foundations - £5,946

Convert a bungalow loft - £28,696

Convert a basement - £34,080