| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | W D F Inc | Fire protection engineering | 1 |
| 2 | Warrington Fire Research | Fire protection engineering | 2 |
| 3 | Warrington Fire Research | Fire protection engineering | 6 |
| 4 | Warringtonfire | Fire protection engineering | 1 |
| 5 | Warringtonfire | Fire protection engineering | 4 |
| 6 | Wayman Fire Protection | Fire protection engineering | 0 |
| 7 | Wayne Automatic Fire Sprinklers | Fire protection engineering | 10 |
| 8 | Wayne Automatic Fire Sprinklers | Fire protection engineering | 3 |
| 9 | Wayne Automatic Fire Sprinklers, Inc. | Fire protection engineering | 13 |
| 10 | Wayne Automatic Sprinklers Inc. | Fire protection engineering | 0 |
| 11 | Werco Building Specialties Inc | Fire protection engineering | 0 |
| 12 | Western Auto Sprinklers | Fire protection engineering | 0 |
| 13 | Western Fire Protection | Fire protection engineering | 1 |
| 14 | Western Kentucky Sprinkler | Fire protection engineering | 0 |
| 15 | Western States Fire Protection | Fire protection engineering | 0 |
| 16 | Western States Fire Protection | Fire protection engineering | 1 |
| 17 | Western States Fire Protection | Fire protection engineering | 1 |
| 18 | Western States Fire Protection | Fire protection engineering | 0 |
| 19 | Western States Fire Protection (Phoenix) | Fire protection engineering | 4 |
| 20 | Western States Fire Protection Co. | Fire protection engineering | 4 |