| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Structural engineering | 259 | |
| 2 | R A Libner Ltd | Structural engineering | 0 |
| 3 | R B F | Structural engineering | 1 |
| 4 | R G Vogel Structural Engineer | Structural engineering | 3 |
| 5 | R J Evans Knowles & Partners | Structural engineering | 0 |
| 6 | R J Moon | Structural engineering | 1 |
| 7 | R J S Concrete | Structural engineering | 0 |
| 8 | R Kelly Engineering | Structural engineering | 1 |
| 9 | R L Balogh Engineer | Structural engineering | 0 |
| 10 | R L Horvath Associates Inc. | Structural engineering | 1 |
| 11 | R L Plowfield & Associates | Structural engineering | 15 |
| 12 | R M J & Associates | Structural engineering | 2 |
| 13 | R O Youker | Structural engineering | 0 |
| 14 | R P Hirsch & Company | Structural engineering | 1 |
| 15 | R P Hirsh & Company Inc | Structural engineering | 1 |
| 16 | R P Whitten & Assocs Inc | Structural engineering | 0 |
| 17 | R Perreteu & P Milleter | Structural engineering | 1 |
| 18 | R T H Engineering | Structural engineering | 1 |
| 19 | R W Wiley & Associates | Structural engineering | 1 |
| 20 | R-mac Engineering Co | Structural engineering | 0 |
