| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | 11.04 Architects Ltd. | architect | 0 |
| 2 | 3DReid | architect | 2 |
| 3 | 3s Architects LLP | architect | 0 |
| 4 | 3W | architect | 0 |
| 5 | 6a Architects | architect | 0 |
| 6 | 777 Demolition Ltd. | demolition company | 1 |
| 7 | A2Dominion Housing Group Ltd. | developer | 0 |
| 8 | Abbey, Hanson, Rowe & Partners | architect | 1 |
| 9 | Abbott Howard Partnership | architect | 0 |
| 10 | Aberdeen Property Investors | asset manager | 0 |
| 11 | ABK Architects | architect | 0 |
| 12 | ABN AMRO Structured Real Estate Capital | asset manager | 0 |
| 13 | ABP Chartered Architects | architect | 0 |
| 14 | Abstract Land Limited | developer | 1 |
| 15 | Abstract Securities (London) Ltd. | developer | 1 |
| 16 | Acanthus LW Architects LLP | architect | 2 |
| 17 | Accent BDA Ltd. | architect | 0 |
| 18 | Access=Design | consultant | 1 |
| 19 | ACE European Group | tenant | 1 |
| 20 | ACQ Ltd. | architect | 0 |