| Business | Phone |
| Bierly Construction 1002 Santa Monica Ct, Pleasant Hill 94523 | (925) 691-0300 |
| Morgam Controls Engineering 60 Mckissick St, Pleasant Hill 94523 | (925) 946-5858 |
| R J Gordon Construction Inc Po Box 23204, Pleasant Hill 94523 | (925) 680-8660 |
| Think Engineering 121 Starlyn Dr, Pleasant Hill 94523 | (925) 906-9759 |
| Transbay Engineering 1630 Contra Costa Blvd, Pleasant Hill 94523 | (925) 941-4913 |