| Business | Phone |
| Harold R Stark Ltd 255 Simcoe St S, Oshawa L1H 4H3 | (905) 725-7321 |
| J Carlson Mechanical Ltd 1019 Nelson St, Oshawa L1H 7N9 | (905) 725-2919 |
| Mutual Mechanical 869 Nelson St #5, Oshawa L1H 5N7 | (905) 579-6089 |
| Dalray Contracting Inc 575 Wentworth St E, Oshawa L1H 3V8 | (905) 432-5070 |