Range from the cheapest single storey extension £36,600 (Firenstack Solutions based in BT6) to the dearest single storey extension £39,000 (Colin Gilmore Building Contractor based in BT22).
Comparing extension builders estimates for fitting a downstairs toilet gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to build a single storey extension in Portaferry by posting a job with HaMuch and we will send it to extension builders in Portaferry.

| Business name | Single storey extension cost |
|---|---|
| Colin Gilmore Building Contractor, Newtownards, BT22 | £39,000 |
| apex pharaoh ltd, Down, bt30 | £37,720 |
| N W Doyle & Son, Ballynahinch, BT24 | £39,000 |
| Mount Oriel Conversions & Extensions, Belfast, BT8 | £36,920 |
| AK Building Services, Carryduff, BT8 | £38,040 |
| McEvoy Building & Joinery, Cregagh, BT6 | £36,920 |
| Firenstack Solutions, Cregagh, BT6 | £36,600 |
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Single Storey Extension near Portaferry | £20 | £150 |
| Single Storey Extension near Saintfield | £20 | £141 |
| Single Storey Extension near Ballynahinch | £15 | £150 |
| Single Storey Extension near Comber | £20 | £142 |
| Single Storey Extension near Ballygowan | £20 | £150 |
| Single Storey Extension near Carryduff | £19 | £130 |
| Single Storey Extension near Bangor | £20 | £150 |
| Single Storey Extension near Bangor | £20 | £150 |
| Single Storey Extension near Holywood | £19 | £125 |
| Single Storey Extension near Belfast | £19 | £132 |