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Select your affordable Carrickfergus extension builder
From £21,296
Ballantine building solutions is an established extension buildering business in Carrickfergus. We come highly recommended and provide competitive ...
From £21,264
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. D...
From £21,384
Designco Ltd is an established extension buildering business in Carrickfergus. We come highly recommended and provide competitive quotes for your w...

A flat roof extension ranges from the cheapest of £21,264 (DGA based in BT37) to the dearest of £21,384 (Designco Ltd based in BT36), 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 Carrickfergus by posting a job with HaMuch. We'll send it to extension builders in Carrickfergus.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Carrickfergus | £23 | £158 |
| Build A Flat Roof Extension near Greenisland | £23 | £153 |
| Build A Flat Roof Extension near Holywood | £23 | £159 |
| Build A Flat Roof Extension near Bangor | £24 | £183 |
| Build A Flat Roof Extension near Bangor | £24 | £183 |
| Build A Flat Roof Extension near Larne | £15 | £122 |
| Build A Flat Roof Extension near Ballyclare | £20 | £124 |
| Build A Flat Roof Extension near Belfast | £23 | £161 |
| Build A Flat Roof Extension near Ballygowan | £24 | £183 |
| Build A Flat Roof Extension near Comber | £22 | £160 |
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 - £16,815

Two storey extension - £86,972

Build a timber frame extension - £25,315

Build a swimming pool - £80,315

Single storey extension - £41,293

Side return extension - £33,790

Install an RSJ - £1,515

Outbuilding - £9,315

Build a Mansard loft conversion - £51,315

Loft conversion - £27,325

Build a kitchen extension - £41,315

Hip to gable loft conversion - £41,315

Granny annexe - £86,315

Garden office - £9,315

Convert a Garage - £15,315

Garage - £17,815

Build a flat roof extension - £21,315

Build a dormer loft conversion - £41,315

Concrete foundations - £5,565

Convert a bungalow loft - £28,315

Convert a basement - £29,790