| Business | Phone |
| Blair Engineering Consultants 28021 Couzens Ave, Madison Heights 48071 | (248) 548-0626 |
| Engineering Analysis Svc 1551 E Lincoln Ave, Madison Heights 48071 | (248) 582-3800 |
| H W Wilson Engineering Svc 30391 Yorkshire Dr, Madison Heights 48071 | (248) 585-2732 |