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Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
Relax... you have found a reliable extension builder in BT8. SM Plumbing & Heating is a friendly and reliable company based in BT8 who consider no ...
From £21,176
Trusted and professional extension builder in BT8. Experienced in all extension buildering work and keeping within budget and on quote. Extended li...

A flat roof extension ranges from the cheapest of £21,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of £21,488 (AK Building Services based in BT8), 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 BT8 by posting a job with HaMuch. We'll send it to extension builders in BT8.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Carryduff | £23 | £158 |
| Build A Flat Roof Extension near Belfast | £23 | £161 |
| Build A Flat Roof Extension near Saintfield | £23 | £162 |
| Build A Flat Roof Extension near Lisburn | £24 | £164 |
| Build A Flat Roof Extension near Comber | £22 | £160 |
| Build A Flat Roof Extension near Ballygowan | £24 | £183 |
| Build A Flat Roof Extension near Holywood | £23 | £159 |
| Build A Flat Roof Extension near Ballynahinch | £19 | £189 |
| Build A Flat Roof Extension near Hillsborough and Culcavy | £25 | £170 |
| Build A Flat Roof Extension near Greenisland | £23 | £153 |
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 - £16,792

Two storey extension - £86,938

Build a timber frame extension - £25,292

Build a swimming pool - £80,292

Single storey extension - £40,840

Side return extension - £33,535

Install an RSJ - £1,492

Outbuilding - £9,292

Build a Mansard loft conversion - £51,292

Loft conversion - £27,113

Build a kitchen extension - £41,292

Hip to gable loft conversion - £41,292

Granny annexe - £86,292

Garden office - £9,292

Convert a Garage - £15,292

Garage - £17,792

Build a flat roof extension - £21,292

Build a dormer loft conversion - £41,292

Concrete foundations - £5,542

Convert a bungalow loft - £28,292

Convert a basement - £29,535