Relax... you have found a reliable extension builder in BT7. SM Plumbing & Heating is a friendly and reliable company based in BT7 who consider no ...
From £86,176
Trusted and professional extension builder in BT7. Experienced in all extension buildering work and keeping within budget and on quote. Extended li...

Building a granny annexe ranges from £86,176 (Extended living by Gilbert-Ash based in BT12) to £86,368 (SM Plumbing & Heating based in BT7), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in BT7 by posting a job with HaMuch. We will send it to extension builders in BT7 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Belfast | £23 | £161 |
| Granny Annexe near Carryduff | £23 | £158 |
| Granny Annexe near Holywood | £23 | £159 |
| Granny Annexe near Lisburn | £24 | £164 |
| Granny Annexe near Comber | £22 | £160 |
| Granny Annexe near Greenisland | £23 | £153 |
| Granny Annexe near Ballygowan | £24 | £183 |
| Granny Annexe near Saintfield | £23 | £162 |
| Granny Annexe near Hillsborough and Culcavy | £25 | £170 |
| Granny Annexe 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 - £16,772

Two storey extension - £86,908

Build a timber frame extension - £25,272

Build a swimming pool - £80,272

Single storey extension - £40,440

Side return extension - £33,310

Install an RSJ - £1,472

Outbuilding - £9,272

Build a Mansard loft conversion - £51,272

Loft conversion - £26,925

Build a kitchen extension - £41,272

Hip to gable loft conversion - £41,272

Granny annexe - £86,272

Garden office - £9,272

Convert a Garage - £15,272

Garage - £17,772

Build a flat roof extension - £21,272

Build a dormer loft conversion - £41,272

Concrete foundations - £5,522

Convert a bungalow loft - £28,272

Convert a basement - £29,310