| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | IFG Institut für Geotechnik | Geotechnical engineering | 5 |
| 2 | immig - viehmann Geo- und Umwelttechnik | Geotechnical engineering | 1 |
| 3 | INSPEC-SOL | Geotechnical engineering | 1 |
| 4 | Intrafor Asia | Geotechnical engineering | 43 |
| 5 | Iranzo | Geotechnical engineering | 29 |
| 6 | Irvine Geotechnical | Geotechnical engineering | 2 |
| 7 | Isherwood Associates | Geotechnical engineering | 38 |
| 8 | ITUS GmbH & Co. KG | Geotechnical engineering | 1 |
| 9 | ITUS Schreiber & Knab GbR | Geotechnical engineering | 6 |