| Turner & Townsend Project Management | Leeds, Glasgow, Edinburgh | 39 | 13 |
| Turner & Townsend | Leeds, London, Manchester | 38 | 39 |
| Turner & Townsend Cost Management | Leeds, Nottingham, Bristol | 14 | 5 |
| Turner & Townsend Consulting | Leeds, West, Newcastle upon Tyne | 9 | 5 |
| Turner & Townsend Contract Services | Leeds, Birmingham | 3 | 3 |
| Mace TT with Turner Townsend Project Management | London | 1 | 1 |
| AECOM | London, Leeds, Wimbledon | 21 | 137 |
| Currie & Brown | London, Edinburgh, Eurocentral | 15 | 29 |
| Mott Macdonald | Croydon, Edinburgh, Glasgow | 14 | 60 |
| WSP | London, Glasgow, Edinburgh | 15 | 132 |
| Faithful Gould | Epsom, Glasgow, Edinburgh | 13 | 44 |
| Arcadis Consulting | London, Cardiff | 13 | 23 |
| Atkins | Epsom, Glasgow, London | 12 | 128 |
| Jacobs | Wokingham, London, Bristol | 10 | 62 |
| CPC Project Services | London, Stoke on Trent | 10 | 16 |
| Rider Levett Bucknall | Birmingham, Sheffield | 11 | 21 |
| Ove Arup & Partners | London | 8 | 72 |
| Gardiner & Theobald | London, Glasgow | 10 | 10 |
| Ridge & Partners | Woodstock, Liverpool, Manchester | 7 | 38 |
| Clancy Consulting | Glasgow, Altrincham, Leeds | 7 | 6 |
| Gleeds Cost Management | London, Glasgow, Leeds | 7 | 5 |
| Mace | London, Manchester | 6 | 26 |
| Pennington Choices | Norcott Brook, Cheshire West and Chester, Warrington | 6 | 18 |
| Si Sealy & Associates | Stockport | 5 | 3 |
| Building Design Partnership | Manchester, Islington | 8 | 5 |
| RPS Consulting Services | Abingdon | 7 | 23 |
| Stantec | High Wycombe, Glasgow, Manchester | 7 | 15 |
| Stace | Epping, Epping Forest, Essex | 7 | 7 |
| RG P | Leicester | 7 | 7 |
| Sweco | Leeds, Glasgow, London | 7 | 5 |
| Arcadis | Edinburgh, London, Manchester | 6 | 79 |
| Grant Thornton | London | 6 | 38 |
| Capita Property & Infrastructure | London, Glasgow | 6 | 21 |
| Systra | Glasgow, Woking, London | 5 | 13 |
| Identity Consult | Sunderland, York | 5 | 8 |
| Ahr Architects | Glasgow, London, Huddersfield | 5 | 5 |
| Wilde Consultants | Stockport, Cheshire | 5 | 3 |
| Singleton Clamp & Partners | Manchester | 4 | 5 |
| Watts Group | Leeds, London, City of London | 4 | 4 |
| KPMG | London | 5 | 102 |
| Pricewaterhousecoopers | London, Cardiff | 5 | 75 |
| Calfordseaden | London, Bromley | 5 | 20 |
| Pick Everard | Glasgow, Inverness, Leicester | 5 | 16 |
| Armour Construction Consultants | Glasgow, Kilmarnock | 5 | 5 |
| Deloitte | London | 4 | 122 |
| Land Use Consultants | London, Southwark, Manchester | 4 | 14 |
| Costain | Manchester, Maidenhead, London | 4 | 14 |
| Ahr Building Consultancy | London, Islington, Huddersfield | 4 | 8 |
| Sutcliffe Projects | Liverpool | 4 | 6 |
| Hickton Consultants | Barnsley, Elsecar | 4 | 6 |
| Ecs Consultants | Cheadle, Cheshire | 4 | 6 |
| WT Partnership | Croydon, Manchester | 4 | 5 |
| JNP Group Consulting Engineers | Brighouse, Chiltern | 4 | 4 |
| Tetra TECH | Leeds | 4 | 4 |
| Hawkins Brown Design | London | 3 | 7 |
| Environment Partnership | Warrington | 3 | 8 |
| Pozzoni Architecture | Altrincham, Cheshire | 3 | 2 |
| Ernst & Young | London | 4 | 89 |
| Arcus Consulting | Sale | 4 | 16 |
| Robinson Low Francis | Glasgow | 4 | 14 |
| Jeremy Benn Associates | Edinburgh, Skipton | 4 | 8 |
| Hoare Lea | Bristol | 4 | 10 |
| Curtins | Liverpool | 4 | 6 |
| Whiteleyeaves | Oldham | 4 | 7 |
| Hurley Palmer Flatt | Glasgow | 4 | 3 |
| Aird Geomatics | Glasgow | 4 | 4 |
| Ecd Architects | Glasgow | 4 | 4 |
| Holmes Miller | Glasgow | 4 | 4 |
| Robert POTTER & Partners | Glasgow | 4 | 4 |
| Savills | London, Westminster | 3 | 30 |
| Curtins Consulting | Liverpool, Leeds | 3 | 16 |
| Michael Dyson Associates | Holmfirth, Honley | 3 | 13 |
| Aa Projects | Manchester | 3 | 11 |
| Integrated Water Services | Walsall | 3 | 9 |
| Wardell Armstrong | Stoke on Trent | 3 | 17 |
| Avison Young | Birmingham | 3 | 12 |
| Amey OW | Oxfordshire, London | 3 | 13 |
| Harmony Fire | Chilthorne Domer | 3 | 10 |
| SGS | Ellesmere Port | 3 | 10 |
| Moorhouse Consulting | London | 3 | 13 |
| Socotec | Burton on Trent | 3 | 7 |
| Sda Consulting | Manchester, Salford | 3 | 6 |
| Pell Frischmann Consultants | Wakefield, London | 3 | 9 |
| Total Environmental Compliance | Corby | 3 | 4 |
| Mason Clark Associates | Hull | 3 | 7 |
| Pell Frischmann Consulting Engineers | London | 3 | 5 |
| Ibi Group | Didsbury, Greater Manchester | 3 | 3 |
| FCS Live | Newbury | 3 | 3 |
| Services Design Associates | Sheffield | 3 | 3 |
| Gutteridge Haskins & Davey | Chester, London | 3 | 2 |
| Trent Architecture Design | Sheffield | 3 | 2 |
| Abbey Fire | Runcorn | 3 | 3 |
| Aqua Allies | Peterborough | 3 | 3 |
| A&E Fire & Security | Gloucester | 3 | 3 |
| Fire Compliance Management Services | Warrington | 3 | 3 |
| Global Hse Solutions | Bingham | 3 | 3 |
| H2O Hygiene | Walsall | 3 | 3 |
| Healthy Buildings Ireland | Newry | 3 | 3 |
| Osterna | Northwich | 3 | 3 |
| Qube Environmental | Stafford | 3 | 3 |