From £86,512
N W Doyle & Son is a trusted extension builder serving customers in BT30 and the surrounding area. Contact us to today to get a competitive quote f...
From £86,272
apex pharaoh ltd is a trusted extension builder serving customers in BT30 and the surrounding area. Contact us to today to get a competitive quote ...
From £86,312
Colin Gilmore Building Contractor is an established extension buildering business in BT30. We come highly recommended and provide competitive quote...
From £86,136
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £86,496
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,400
T.I Building is a trusted extension builder serving customers in BT30 and the surrounding area. Contact us to today to get a competitive quote for ...
From £86,384
Relax... you have found a reliable extension builder in BT30. Finch Construction NI is a friendly and reliable company based in BT30 who consider n...
From £86,176
Trusted and professional extension builder in BT30. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £86,368
Relax... you have found a reliable extension builder in BT30. SM Plumbing & Heating is a friendly and reliable company based in BT30 who consider n...

Building a granny annexe ranges from £86,136 (Mount Oriel Conversions & Extensions based in BT8) to £86,512 (N W Doyle & Son based in BT24), 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 BT30 by posting a job with HaMuch. We will send it to extension builders in BT30 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Portaferry | £22 | £164 |
| Granny Annexe near Ballynahinch | £19 | £189 |
| Granny Annexe near Saintfield | £23 | £162 |
| Granny Annexe near Comber | £22 | £160 |
| Granny Annexe near Ballygowan | £24 | £183 |
| Granny Annexe near Carryduff | £23 | £158 |
| Granny Annexe near Hillsborough and Culcavy | £25 | £170 |
| Granny Annexe near Lisburn | £24 | £164 |
| Granny Annexe near Belfast | £23 | £161 |
| Granny Annexe near Holywood | £23 | £159 |
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 - £16,854

Two storey extension - £87,032

Build a timber frame extension - £25,354

Build a swimming pool - £80,354

Single storey extension - £42,088

Side return extension - £34,237

Install an RSJ - £1,554

Outbuilding - £9,354

Build a Mansard loft conversion - £51,354

Loft conversion - £27,698

Build a kitchen extension - £41,354

Hip to gable loft conversion - £41,354

Granny annexe - £86,354

Garden office - £9,354

Convert a Garage - £15,354

Garage - £17,854

Build a flat roof extension - £21,354

Build a dormer loft conversion - £41,354

Concrete foundations - £5,604

Convert a bungalow loft - £28,354

Convert a basement - £30,237