A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in Castlewellan?
Building a granny annexe ranges from £86,096 (Mount Oriel Conversions & Extensions based in BT8) to £86,280 (Ballygrange Contracts based in BT34), 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 Castlewellan by posting a job with HaMuch. We will send it to extension builders in Castlewellan who will be happy to help you.

| Business name | Granny annexe cost |
|---|---|
| N W Doyle & Son, Ballynahinch, BT24 | £86,200 |
| Ballygrange Contracts, Down, BT34 | £86,280 |
| JDL Contracts, Newry, BT34 | £86,200 |
| apex pharaoh ltd, Down, bt30 | £86,136 |
| Mount Oriel Conversions & Extensions, Belfast, BT8 | £86,096 |
| T.I Building, Ballinderry, BT28 | £86,104 |
| AK Building Services, Carryduff, BT8 | £86,152 |
| Finch Construction NI, Antrim, BT28 | £86,184 |
| The Method Group, Gibson's Hill, Craigavon, BT66 | £86,224 |
| Power Construction, Drumgor, BT65 | £86,224 |
| R.J Builders, Aghagallon, BT67 | £86,144 |
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Ballynahinch | £15 | £150 |
| Granny Annexe near Saintfield | £20 | £141 |
| Granny Annexe near Hillsborough and Culcavy | £21 | £141 |
| Granny Annexe near Kilkeel | £24 | £155 |
| Granny Annexe near Lisburn | £20 | £139 |
| Granny Annexe near Waringstown | £21 | £146 |
| Granny Annexe near Maghaberry | £27 | £175 |
| Granny Annexe near Carryduff | £19 | £130 |
| Granny Annexe near Portaferry | £20 | £150 |
| Granny Annexe near Comber | £20 | £142 |