| Business | Phone |
| Basic Engineering Inc 4911 Hickory Pointe Blvd, Ypsilanti 48197 | (734) 434-1287 |
| Infrastructure Engineering 1904 Collegewood St, Ypsilanti 48197 | (734) 480-0500 |
| Neff Engineering 1451 Kingwood St, Ypsilanti 48197 | (734) 485-4526 |
| Kubiske & Assoc 1430 E Michigan Ave, Ypsilanti 48198 | (734) 481-1322 |
| Reynolds Smith & Hills 827 Willow Run Airport, Ypsilanti 48198 | (734) 484-0962 |