| 3D Reid | Architect, Renovation Architect | 19 |
| Aedas Architects | Architect, Masterplanning Architect, Renovation Architect | 32 |
| Allford Hall Monaghan Morris | Architect, Renovation Architect | 19 |
| Anthony Salvin | Architect, Renovation Architect | 2 |
| Architecture TWS | Renovation Architect | 1 |
| Arup Group | Access Consultant, Architect, Consulting Engineer, Fire Engineer, Geotechnical Consultant, Lift Supplier, Main Contractor, Renovation Architect, Services Engineer, Structural Engineer, Transport Consultant | 102 |
| Ashley & Newman | Renovation Architect | 1 |
| Assael Architecture | Architect, Masterplanning Architect, Renovation Architect | 31 |
| Associated Architects | Architect, Renovation Architect | 6 |
| Aukett Fitzroy Robinson | Architect, Renovation Architect | 11 |
| Avanti Architects | Architect, Renovation Architect | 2 |
| Avery Associates Architects | Architect, Renovation Architect | 2 |
| AWW Architecture | Architect, Renovation Architect | 3 |
| Baily Garner | Architect, Renovation Architect | 6 |
| Barlow Henley Architects | Renovation Architect | 1 |
| Bennetts Associates | Architect, Renovation Architect | 11 |
| Biq Architecten | Renovation Architect | 1 |
| Bryden Wood Associates | Renovation Architect | 1 |
| Charles Marriott Oldrid Scott | Architect, Renovation Architect | 2 |
| Conran And Partners | Architect, Renovation Architect | 2 |
| Cooper Cromar | Architect, Renovation Architect | 14 |
| David Ball Restoration Ltd | Renovation Architect | 1 |
| David Morley Architects | Architect, Renovation Architect | 2 |
| Denton Corker Marshall | Architect, Renovation Architect | 12 |
| DLG Architects | Architect, Renovation Architect | 4 |
