| AECOM (Architecture) | Firms (Office Location) |
| Aedas | Firms (Office Location) |
| Callison | Firms (Office Location) |
| Fentress Architects | Firms (Office Location) |
| FreemanWhite | Firms (Office Location) |
| Gensler | Firms (Office Location) |
| Hart | Howerton | Firms (Office Location) |
| HDR Architecture | Firms (Office Location) |
| Heathrow Airport (LHR), Terminal 5 | Airports |
| Heathrow Airport (LHR), Europier | Airports |
| Heathrow Airport (LHR), Pier 4A | Airports |
| HKS, Inc. | Firms (Office Location) |
| HLW International | Firms (Office Location) |
| HOK | Firms (Office Location) |
| Jacobs (Architecture) | Firms (Office Location) |
| Kohn Pedersen Fox | Firms (Office Location) |
| Mancini - Duffy | Firms (Office Location) |
| NBBJ | Firms (Office Location) |
| Populous | Firms (Office Location) |
| Rafael Viñoly Architects | Firms (Office Location) |
| RMJM | Firms (Office Location) |
| RTKL Associates Inc. | Firms (Office Location) |
| Skidmore, Owings & Merrill | Firms (Office Location) |
| SLCE Architects | Firms (Office Location) |
| Stansted Airport (STN) | Airports |
| Stantec Inc. | Firms (Office Location) |
| Swanke Hayden Connell Architects | Firms (Office Location) |
| Wimberly Allison Tong & Goo (WATG) | Firms (Office Location) |
