| Aecom |
| Arup |
| Atkins |
| Barrett Mahony Consulting Engineers |
| Byrne Ó Cléirigh |
| Clifton Scannell Emerson Associates |
| CORA Consulting Engineers |
| CS Consulting |
| DBFL Consulting Engineers |
| Deloitte |
| Dornan Engineering Ltd. |
| Downes Associates |
| DPS Engineering |
| EDC Engineering Design Consultants |
| Ethos Engineering Ltd |
| Evolusion Innovation |
| Fehily Timoney & Company |
| Garland |
| Gavin & Doherty Geosolutions Ltd |
| Hayes Higgins Partnership |
| IN2 Engineering Design Partnership |
| Indigo |
| J.B. Barry and Partners Ltd |
| Jennings O'Donovan & Partners Limited |
| John Paul Construction |
| Kilgallen and Partners Consulting Engineers |
| LotusWorks |
| Mott MacDonald Ireland Ltd |
| Malone Group |
| Malone O'Regan |
| MWP |
| Nicholas O'Dwyer |
| O'Connor Sutton Cronin Multidisciplinary Consulting |
| ORS |
| PM Group |
| PUNCH Consulting Engineers |
| Rowan Engineering Consultants |
| Roughan and O'Donovan Consulting Engineers |
| RPS Group |
| Ryan Hanley |
| Tandem Project Management |
| TJ O'Connor & Associates |
| TOBIN Consulting Engineers |
| Varming Consulting Engineers |
| Waterman Consulting Engineers |
| Weltec Engineering |
| Winthrop Engineering and Contracting Ltd. |
| Zenith Technologies Ltd. |