| Business | Phone |
| Highway Construction Inspctn 30 Hunt St, Ajax L1S 3M2 | (905) 619-3157 |
| Multec Canada 555 Kingston Rd W, Ajax L1S 6M1 | (905) 426-5822 |
| Sabourin Kimble & Assocs Ltd 110 Old Kingston Rd, Ajax L1T 2Z9 | (905) 426-9451 |
| Secant Engineers Inc 1 Doyle Crt, Ajax L1S 7A9 | (905) 683-7042 |
| Waas Engineering Ltd 158 Harwood Ave S, Ajax L1S 2H6 | (905) 686-3788 |
| Dender Consulting Svc Inc 45 Cumberland Lane #605, Ajax L1S 7K3 | (905) 428-2626 |
| Ferrex Engineering Ltd 253 Lake Driveway W, Ajax L1S 5B5 | (905) 683-8518 |