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From £21,336
Trusted and professional extension builder in Crumlin. Experienced in all extension buildering work and keeping within budget and on quote. Belfast...

A flat roof extension ranges from the cheapest of £21,336 (Belfast Loft Company based in BT17) to the dearest of £22,560 (Build a Boiler based in BT67), 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 Crumlin by posting a job with HaMuch. We'll send it to extension builders in Crumlin.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Crumlin | £26 | £194 |
| Build A Flat Roof Extension near Maghaberry | £31 | £205 |
| Build A Flat Roof Extension near Lisburn | £24 | £164 |
| Build A Flat Roof Extension near Hillsborough and Culcavy | £25 | £170 |
| Build A Flat Roof Extension near Belfast | £23 | £161 |
| Build A Flat Roof Extension near Ballyclare | £20 | £124 |
| Build A Flat Roof Extension near Carryduff | £23 | £158 |
| Build A Flat Roof Extension near Waringstown | £23 | £167 |
| Build A Flat Roof Extension near Greenisland | £23 | £153 |
| Build A Flat Roof Extension near Holywood | £23 | £159 |
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 - £17,448

Two storey extension - £87,922

Build a timber frame extension - £25,948

Build a swimming pool - £80,948

Single storey extension - £53,960

Side return extension - £40,915

Install an RSJ - £2,148

Outbuilding - £9,948

Build a Mansard loft conversion - £51,948

Loft conversion - £33,263

Build a kitchen extension - £41,948

Hip to gable loft conversion - £41,948

Granny annexe - £86,948

Garden office - £9,948

Convert a Garage - £15,948

Garage - £18,448

Build a flat roof extension - £21,948

Build a dormer loft conversion - £41,948

Concrete foundations - £6,198

Convert a bungalow loft - £28,948

Convert a basement - £36,915