From £9,368
Relax... you have found a reliable extension builder in BT6. SM Plumbing & Heating is a friendly and reliable company based in BT6 who consider no ...
From £9,176
Trusted and professional extension builder in BT6. Experienced in all extension buildering work and keeping within budget and on quote. Extended li...
From £9,384
Designco Ltd is an established extension buildering business in BT6. We come highly recommended and provide competitive quotes for your work.
From £9,136
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £9,336
Trusted and professional extension builder in BT6. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lof...
From £9,296
Ballantine building solutions is an established extension buildering business in BT6. We come highly recommended and provide competitive quotes for...
From £9,376
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £9,384
Relax... you have found a reliable extension builder in BT6. Finch Construction NI is a friendly and reliable company based in BT6 who consider no ...
From £9,264
Trusted and professional extension builder in BT6. Experienced in all extension buildering work and keeping within budget and on quote. DGA have ma...

Outbuilding costs in BT6 range from the cheapest of £9,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of £9,488 (AK Building Services based in BT8), 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 BT6 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 Carryduff | £23 | £158 |
| Outbuilding near Holywood | £23 | £159 |
| Outbuilding near Comber | £22 | £160 |
| Outbuilding near Ballygowan | £24 | £183 |
| Outbuilding near Lisburn | £24 | £164 |
| Outbuilding near Greenisland | £23 | £153 |
| Outbuilding near Saintfield | £23 | £162 |
| Outbuilding near Hillsborough and Culcavy | £25 | £170 |
| Outbuilding near Bangor | £24 | £183 |
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 - £16,821

Two storey extension - £86,981

Build a timber frame extension - £25,321

Build a swimming pool - £80,321

Single storey extension - £41,416

Side return extension - £33,859

Install an RSJ - £1,521

Outbuilding - £9,321

Build a Mansard loft conversion - £51,321

Loft conversion - £27,383

Build a kitchen extension - £41,321

Hip to gable loft conversion - £41,321

Granny annexe - £86,321

Garden office - £9,321

Convert a Garage - £15,321

Garage - £17,821

Build a flat roof extension - £21,321

Build a dormer loft conversion - £41,321

Concrete foundations - £5,571

Convert a bungalow loft - £28,321

Convert a basement - £29,859