| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | SBM Consulting Engineers, Inc. | MEP engineering | 9 |
| 2 | Schade-Peyton, Inc. | MEP engineering | 1 |
| 3 | SCHINDLER Ingenieurgesellschaft mbH | MEP engineering | 4 |
| 4 | Schlenger/Pitz & Associates, Inc. | MEP engineering | 4 |
| 5 | Schmidt & Stacy | MEP engineering | 14 |
| 6 | Schmidt Reuter Ingenieurgesellschaft mbH & Partner KG | MEP engineering | 31 |
| 7 | Scholze Ingenieurgesellschaft mbH | MEP engineering | 7 |
| 8 | SDM Consulting Engineers | MEP engineering | 11 |
| 9 | SDT International LLC | MEP engineering | 1 |
| 10 | SE Consult s.a. | MEP engineering | 1 |
| 11 | Sea Pac Engineering, Inc. | MEP engineering | 0 |
| 12 | Seelye Stevenson Value & Knecht | MEP engineering | 5 |
| 13 | Segner & Dalton Consulting Engineers | MEP engineering | 2 |
| 14 | SEi Companies, Inc. | MEP engineering | 3 |
| 15 | SEi Companies, Inc. | MEP engineering | 14 |
| 16 | Seveko VVS Konsult AB | MEP engineering | 2 |
| 17 | SH.Y.Braha | MEP engineering | 4 |
| 18 | Shantou Construction & Installation | MEP engineering | 6 |
| 19 | Sherwin Stenn Engineers Inc. | MEP engineering | 1 |
| 20 | Sibat | MEP engineering | 2 |