Relax... you have found a reliable extension builder in BT13. SM Plumbing & Heating is a friendly and reliable company based in BT13 who consider n...
From £86,336
Trusted and professional extension builder in BT13. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £86,176
Trusted and professional extension builder in BT13. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £86,384
Designco Ltd is an established extension buildering business in BT13. We come highly recommended and provide competitive quotes for your work.
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Building a granny annexe ranges from £86,176 (Extended living by Gilbert-Ash based in BT12) to £86,384 (Designco Ltd based in BT36), 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 BT13 by posting a job with HaMuch. We will send it to extension builders in BT13 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 Greenisland | £23 | £153 |
| Granny Annexe near Lisburn | £24 | £164 |
| Granny Annexe near Comber | £22 | £160 |
| Granny Annexe near Crumlin | £26 | £194 |
| Granny Annexe near Ballyclare | £20 | £124 |
| Granny Annexe near Ballygowan | £24 | £183 |
| Granny Annexe near Hillsborough and Culcavy | £25 | £170 |
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 - £16,816

Two storey extension - £86,974

Build a timber frame extension - £25,316

Build a swimming pool - £80,316

Single storey extension - £41,320

Side return extension - £33,805

Install an RSJ - £1,516

Outbuilding - £9,316

Build a Mansard loft conversion - £51,316

Loft conversion - £27,338

Build a kitchen extension - £41,316

Hip to gable loft conversion - £41,316

Granny annexe - £86,316

Garden office - £9,316

Convert a Garage - £15,316

Garage - £17,816

Build a flat roof extension - £21,316

Build a dormer loft conversion - £41,316

Concrete foundations - £5,566

Convert a bungalow loft - £28,316

Convert a basement - £29,805