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Relax... you have found a reliable extension builder in BT4. SM Plumbing & Heating is a friendly and reliable company based in BT4 who consider no ...

Building a granny annexe ranges from £86,368 (SM Plumbing & Heating based in BT7) 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 BT4 by posting a job with HaMuch. We will send it to extension builders in BT4 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Belfast | £23 | £161 |
| Granny Annexe near Holywood | £23 | £159 |
| Granny Annexe near Carryduff | £23 | £158 |
| Granny Annexe near Comber | £22 | £160 |
| Granny Annexe near Greenisland | £23 | £153 |
| Granny Annexe near Ballygowan | £24 | £183 |
| Granny Annexe near Bangor | £24 | £183 |
| Granny Annexe near Bangor | £24 | £183 |
| Granny Annexe near Carrickfergus | £23 | £158 |
| Granny Annexe near Lisburn | £24 | £164 |
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 - £16,868

Two storey extension - £87,052

Build a timber frame extension - £25,368

Build a swimming pool - £80,368

Single storey extension - £42,360

Side return extension - £34,390

Install an RSJ - £1,568

Outbuilding - £9,368

Build a Mansard loft conversion - £51,368

Loft conversion - £27,825

Build a kitchen extension - £41,368

Hip to gable loft conversion - £41,368

Granny annexe - £86,368

Garden office - £9,368

Convert a Garage - £15,368

Garage - £17,868

Build a flat roof extension - £21,368

Build a dormer loft conversion - £41,368

Concrete foundations - £5,618

Convert a bungalow loft - £28,368

Convert a basement - £30,390