| Business | Phone |
| Jenish Engineering Ltd 1288 Ritson Rd N, Oshawa L1G 7Z9 | (905) 720-4646 |
| Shaheen Peaker Thompson Ltd 220 Cedar Valley Crt, Oshawa L1G 3W1 | (905) 436-9028 |
| Trow Consulting Engineers Ltd 1200 Phillip Murray Ave, Oshawa L1J 6Z8 | (905) 728-4974 |