| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Qantec McWilliams Consulting Engineers | Structural engineering | 1 |
| 2 | QBS International | Structural engineering | 4 |
| 3 | Quality Construction Techniques, Corp. | Structural engineering | 0 |
| 4 | Quantum Consulting Engineers | Structural engineering | 0 |
| 5 | Quinn & Associates | Structural engineering | 7 |
| 6 | Quinn Dressel Associates | Structural engineering | 38 |
| 7 | Quiroga Pfeifer Engineering Inc | Structural engineering | 1 |