| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | C. M. Mathiesen & Co | plumbing engineering | 3 |
| 2 | Dimell Ingenjörsbyrå AB | plumbing engineering | 1 |
| 3 | Elto s.r.l. | plumbing engineering | 0 |
| 4 | Emirates Technical Associates | plumbing engineering | 0 |
| 5 | Facil Consult AB | plumbing engineering | 0 |
| 6 | FLK Sverige AB | plumbing engineering | 2 |
| 7 | Francesco Sambo | plumbing engineering | 2 |
| 8 | Great Lakes Plumbing and Heating | plumbing engineering | 9 |
| 9 | INSTRA Installationskonsult AB | plumbing engineering | 1 |
| 10 | Klare Plumbing | plumbing engineering | 1 |
| 11 | Kon-Ho Lee Consulting Engineering, PLLC | plumbing engineering | 1 |
| 12 | L.E.B Consult AB | plumbing engineering | 2 |
| 13 | McCurdy Mechanical Inc. | plumbing engineering | 1 |
| 14 | Mo Engineering | plumbing engineering | 2 |
| 15 | O'Sullivan, Inc. | plumbing engineering | 2 |
| 16 | Roberts-Hamilton Company | plumbing engineering | 2 |
| 17 | Rörplanering AB | plumbing engineering | 1 |
| 18 | R.W. Sullivan Engineering | plumbing engineering | 6 |
| 19 | Steén VVS Konsult AB | plumbing engineering | 1 |
| 20 | Thomas P. Adamson, Jr. and Associates, Inc. | plumbing engineering | 2 |