Relax... you have found a reliable extension builder in BT15. SM Plumbing & Heating is a friendly and reliable company based in BT15 who consider n...
From £9,296
Ballantine building solutions is an established extension buildering business in BT15. We come highly recommended and provide competitive quotes fo...
From £9,384
Designco Ltd is an established extension buildering business in BT15. We come highly recommended and provide competitive quotes for your work.
...From £9,176
Trusted and professional extension builder in BT15. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...

Outbuilding costs in BT15 range from the cheapest of £9,176 (Extended living by Gilbert-Ash based in BT12) to the dearest of £9,384 (Designco Ltd based in BT36), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in BT15 by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Belfast | £23 | £161 |
| Outbuilding near Holywood | £23 | £159 |
| Outbuilding near Greenisland | £23 | £153 |
| Outbuilding near Carryduff | £23 | £158 |
| Outbuilding near Comber | £22 | £160 |
| Outbuilding near Lisburn | £24 | £164 |
| Outbuilding near Carrickfergus | £23 | £158 |
| Outbuilding near Ballyclare | £20 | £124 |
| Outbuilding near Ballygowan | £24 | £183 |
| Outbuilding near Crumlin | £26 | £194 |
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 - £16,806

Two storey extension - £86,959

Build a timber frame extension - £25,306

Build a swimming pool - £80,306

Single storey extension - £41,120

Side return extension - £33,693

Install an RSJ - £1,506

Outbuilding - £9,306

Build a Mansard loft conversion - £51,306

Loft conversion - £27,244

Build a kitchen extension - £41,306

Hip to gable loft conversion - £41,306

Granny annexe - £86,306

Garden office - £9,306

Convert a Garage - £15,306

Garage - £17,806

Build a flat roof extension - £21,306

Build a dormer loft conversion - £41,306

Concrete foundations - £5,556

Convert a bungalow loft - £28,306

Convert a basement - £29,693