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N W Doyle & Son is a trusted extension builder serving customers in Castlewellan and the surrounding area. Contact us to today to get a competitive...

Building a granny annexe ranges from £86,512 (N W Doyle & Son based in BT24) 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 Castlewellan by posting a job with HaMuch. We will send it to extension builders in Castlewellan who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Ballynahinch | £19 | £189 |
| Granny Annexe near Banbridge | £29 | £205 |
| Granny Annexe near Saintfield | £23 | £162 |
| Granny Annexe near Hillsborough and Culcavy | £25 | £170 |
| Granny Annexe near Kilkeel | £28 | £182 |
| Granny Annexe near Lisburn | £24 | £164 |
| Granny Annexe near Waringstown | £23 | £167 |
| Granny Annexe near Maghaberry | £31 | £205 |
| Granny Annexe near Carryduff | £23 | £158 |
| Granny Annexe near Portaferry | £22 | £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 - £17,012

Two storey extension - £87,268

Build a timber frame extension - £25,512

Build a swimming pool - £80,512

Single storey extension - £45,240

Side return extension - £36,010

Install an RSJ - £1,712

Outbuilding - £9,512

Build a Mansard loft conversion - £51,512

Loft conversion - £29,175

Build a kitchen extension - £41,512

Hip to gable loft conversion - £41,512

Granny annexe - £86,512

Garden office - £9,512

Convert a Garage - £15,512

Garage - £18,012

Build a flat roof extension - £21,512

Build a dormer loft conversion - £41,512

Concrete foundations - £5,762

Convert a bungalow loft - £28,512

Convert a basement - £32,010