Range from the cheapest single storey extension £36,440 (Extended living by Gilbert-Ash based in BT12) to the dearest single storey extension £47,000 (FJS CONTRACTS LTD based in BT45).
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 Randalstown by posting a job with HaMuch and we will send it to extension builders in Randalstown.

"Single storey extension"
ANTRIM
| Business name | Single storey extension cost |
|---|---|
| Oakmore Contracts, Magherafelt, BT45 | £39,000 |
| C McGurk Building Contractor, Belfast , BT44 | £40,600 |
| LM Design & Build, Antrim, BT36 | £38,360 |
| M & M Construction, Mossley, BT36 | £36,600 |
| Belfast Loft Company, Belfast, BT17 | £37,080 |
| Designco Ltd, Antrim, BT36 | £38,040 |
| FJS CONTRACTS LTD, Magherfelt , BT45 | £47,000 |
| DGA, Antrim, BT37 | £38,200 |
| Ballantine building solutions, Antrim, Bt37 | £37,880 |
| H.M.Builders, Andersonstown, BT11 | £36,920 |
| Extended living by Gilbert-Ash, 47 Boucher Road, Belfast, BT12 | £36,440 |
| Seamus Mcmullan building and joinery, Draperstown , BT45 | £47,000 |
| Finch Construction NI, Antrim, BT28 | £38,680 |
| C.H Property Services, Falls Road, BT12 | £36,760 |
| R.J Builders, Aghagallon, BT67 | £37,880 |
| SM Plumbing & Heating, Ormeau, BT7 | £36,760 |
| T.I Building, Ballinderry, BT28 | £37,080 |
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Single Storey Extension near Crumlin | £22 | £168 |
| Single Storey Extension near Ballyclare | £17 | £110 |
| Single Storey Extension near Magherafelt | £25 | £200 |
| Single Storey Extension near Maghaberry | £27 | £175 |
| Single Storey Extension near Greenisland | £20 | £134 |
| Single Storey Extension near Belfast | £19 | £132 |
| Single Storey Extension near Lisburn | £20 | £139 |
| Single Storey Extension near Carrickfergus | £21 | £145 |
| Single Storey Extension near Hillsborough and Culcavy | £21 | £141 |
| Single Storey Extension near Larne | £15 | £120 |