From £86,296
Been in business as 18 years alway put clients first and never had any combacks
From £86,376
Antrim, BT36
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,432
We have over 25 years experience in all building work and renowned for good workmanship All jobs small and large taken on
From £86,384
Antrim, BT36
Designco Ltd is an established extension buildering business in Antrim. We come highly recommended and provide competitive quotes for your work.
From £86,336
Trusted and professional extension builder in Antrim. Experienced in all extension buildering work and keeping within budget and on quote. Belfast ...
From £86,264
Antrim, BT37
Trusted and professional extension builder in Antrim. Experienced in all extension buildering work and keeping within budget and on quote. DGA have...
From £86,296
Antrim, BT37
Ballantine building solutions is an established extension buildering business in Antrim. We come highly recommended and provide competitive quotes ...
From £86,176
Trusted and professional extension builder in Antrim. Experienced in all extension buildering work and keeping within budget and on quote. Extended...
From £86,384
Antrim, BT28
Relax... you have found a reliable extension builder in Antrim. Finch Construction NI is a friendly and reliable company based in Antrim who consid...

Building a granny annexe ranges from £86,176 (Extended living by Gilbert-Ash based in BT12) to £87,560 (Build a Boiler based in BT67), 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 Antrim by posting a job with HaMuch. We will send it to extension builders in Antrim who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Crumlin | £26 | £194 |
| Granny Annexe near Ballyclare | £20 | £124 |
| Granny Annexe near Magherafelt | £30 | £238 |
| Granny Annexe near Maghaberry | £31 | £205 |
| Granny Annexe near Greenisland | £23 | £153 |
| Granny Annexe near Belfast | £23 | £161 |
| Granny Annexe near Lisburn | £24 | £164 |
| Granny Annexe near Carrickfergus | £23 | £158 |
| Granny Annexe near Holywood | £23 | £159 |
| 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 - £16,950

Two storey extension - £87,176

Build a timber frame extension - £25,450

Build a swimming pool - £80,450

Single storey extension - £44,008

Side return extension - £35,317

Install an RSJ - £1,650

Outbuilding - £9,450

Build a Mansard loft conversion - £51,450

Loft conversion - £28,598

Build a kitchen extension - £41,450

Hip to gable loft conversion - £41,450

Granny annexe - £86,450

Garden office - £9,450

Convert a Garage - £15,450

Garage - £17,950

Build a flat roof extension - £21,450

Build a dormer loft conversion - £41,450

Concrete foundations - £5,700

Convert a bungalow loft - £28,450

Convert a basement - £31,317