| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | E + M Tecnica LLP | MEP engineering | 0 |
| 2 | E.K. Fox & Associates, Ltd. | MEP engineering | 3 |
| 3 | E&C Engineers & Consultants Inc. | MEP engineering | 5 |
| 4 | Ebasco Services Incorporated | MEP engineering | 1 |
| 5 | Ebener + Partner Planungsgesellschaft für Elektrotechnik mbH | MEP engineering | 2 |
| 6 | Ebert-Ingenieure Nürnberg | MEP engineering | 10 |
| 7 | ECE Group Limited | MEP engineering | 26 |
| 8 | Edgar Rottenfusser | MEP engineering | 3 |
| 9 | Edward J. Zahorak | MEP engineering | 1 |
| 10 | Edward Pearce & Partners | MEP engineering | 0 |
| 11 | EKJ Rådgivende Ingeniører a/s | MEP engineering | 2 |
| 12 | Elara Energy Services, Inc. | MEP engineering | 1 |
| 13 | Elecnor | MEP engineering | 7 |
| 14 | ElekEn Associates | MEP engineering | 8 |
| 15 | Elemecs Electrical India | MEP engineering | 1 |
| 16 | Elithis | MEP engineering | 2 |
| 17 | Emerald City Engineers, Inc. | MEP engineering | 1 |
| 18 | EN, Inc. | MEP engineering | 2 |
| 19 | Encompass Mechanical Services-Southwest Florida | MEP engineering | 4 |
| 20 | Energy Concepts Engineering PC | MEP engineering | 5 |