| Kier Construction | Sandy, Manchester, Greater Manchester | 26 | 16 |
| Kier Construction London | Loughton | 1 | 4 |
| Kier Construction Northern | Leeds | 1 | 1 |
| Kier Construction Southern | West Sussex | 1 | 1 |
| John Graham Construction | Glasgow, Hillsborough, London | 6 | 21 |
| VINCI Construction | Watford, Rainham | 6 | 23 |
| Interserve Construction | Birmingham, Interserve Construction Limited, West Midlands | 5 | 14 |
| Willmott Dixon Construction | Letchworth Garden City, Surrey, Hertfordshire | 5 | 16 |
| Wates Construction | Leatherhead, Surrey | 4 | 24 |
| Mclaughlin & Harvey | Mallusk, Antrim, County Antrim | 4 | 5 |
| Sir Robert Mcalpine | Hemel Hempstead, Dacorum | 5 | 3 |
| Seddon Construction | Bolton, Altro | 3 | 20 |
| Bam Construction | Edinburgh, Hempstead | 3 | 16 |
| Morris & Spottiswood | Glasgow, Glasgow City | 3 | 7 |
| Speller Metcalfe Malvern | Malvern | 3 | 4 |
| Rydon Construction | East Sussex, Forest Row | 3 | 4 |
| Galliford Try Construction | Guilford, Middlesex, Uxbridge | 3 | 3 |
| Novus Property Solutions | Stoke on Trent | 4 | 32 |
| Morgan Sindall Construction & Infrastructure | London | 3 | 11 |
| Morgan Sindall | London | 3 | 4 |
| J Tomlinson | Birmingham, Nottingham | 2 | 16 |
| Mulalley | Woodford Green, London | 2 | 13 |
| F Parkinson | Blackpool | 2 | 9 |
| RG Carter Cambridge | Norfolk, Norwich | 2 | 13 |
| Neilcott Construction | Orpington, London | 2 | 5 |
| Diamond Build | London | 2 | 5 |
| Ashe Construction | Hitchin, Herts | 2 | 4 |
| GF Tomlinson Building | Little Eaton, Little Eaton Derby | 2 | 3 |
| Bugler Developments | Rickmansworth, Southwest Hertfordshire | 2 | 3 |
| Mclaren Construction | London, Brentwood Esses | 2 | 3 |
| Ark Build | Loughton, Essex | 2 | 2 |
| Cosmur Construction London | Lkondon, London | 2 | 2 |
| John Turner Construction Group | Preston | 2 | 2 |
| City Build Manchester | Preston | 2 | 2 |
| Glenman Corporation | London | 2 | 2 |
| Balfour Beatty Construction | Edinburgh | 2 | 2 |
| Conamar Building Services | Herts, Stevenage | 2 | 2 |
| Feltham Construction | Newbury, Berkshire | 2 | 2 |
| Logan Construction SE | London, Eltham | 2 | 2 |
| RMF | Stirling | 2 | 2 |
| Sol Services | Bletchley, Milton Keynes | 2 | 2 |
| TB Contractors | Bletchley, St Albans | 2 | 2 |
| Warden Construction | Preston | 2 | 2 |
| Galliford Try Building | Uxbridge | 2 | 7 |
| Robertson Construction Group | Stirling | 2 | 11 |
| CCG Scotland | Glasgow | 2 | 3 |
| M&J Group Construction & Roofing | Bedford | 2 | 3 |
| Mclaughlin & Harvey Construction | Cumnock | 2 | 3 |
| Contract Services South Wales | Port Talbot | 2 | 2 |
| Ghi Contracts | Bellshill | 2 | 2 |
| Hadden Construction | Aberuthven | 2 | 2 |
| Henstaff Construction | Swansea | 2 | 2 |
| Engie Regeneration | Waltham Abbey | 1 | 40 |
| Esh Construction | Durham | 1 | 34 |
| Mace | London | 1 | 26 |
| MITIE Property Services | Swindon | 1 | 23 |
| Breyer Group | Romford | 1 | 19 |
| Gelder | Lincoln | 1 | 20 |
| Axis Europe | London | 1 | 27 |
| Overbury | Greater London | 1 | 18 |
| Midas Construction | Bristol | 1 | 11 |
| Bowmer Kirkland | Derbyshire | 1 | 9 |
| Bouygues | London | 1 | 9 |
| Thomas Sinden | Romford | 1 | 8 |
| FM Conway | Sevenoaks | 1 | 9 |
| Ad Construction Group Architectural Decorators | Sidcup | 1 | 7 |
| Conlon Construction | Preston | 1 | 5 |
| Caddick Construction | West Yorkshire | 1 | 5 |
| Carmelcrest | Bishops Stortford | 1 | 5 |
| J Greenwood Builders | Chadderton | 1 | 5 |
| Spie | London | 1 | 5 |
| Eric Wright Construction | Preston | 1 | 4 |
| Amber Construction Services | Barking | 1 | 6 |
| Balfour Beatty | Holytown | 1 | 5 |
| Marlborough Highways | Chelmsford | 1 | 4 |
| Skanska Construction | Hertfordshire | 1 | 3 |
| Stepnell | Warwickshire | 1 | 3 |
| Wilmott Dixon Construction | Letchworth Garden City | 1 | 4 |
| Stack London | London | 1 | 4 |
| Fes Support Services | Stirling | 1 | 3 |
| Harry Fairclough Construction | Warrington | 1 | 3 |
| Herbert T Forrest | Bolton | 1 | 3 |
| Quinn London | London | 1 | 3 |
| Willmott Dixon Interiors | Greater London | 1 | 3 |
| Barnes Construction | Ipswich | 1 | 3 |
| Coulson | Cambridge | 1 | 3 |
| Higgins Construction | Essex | 1 | 3 |
| Midgard | Southern Hertfordshire | 1 | 3 |
| Clark Contracts | Paisley | 1 | 2 |
| H Bell Sons Rochdale | Rochdale | 1 | 2 |
| Henry Boot Construction | Sheffield | 1 | 2 |
| John Sisk | St Albans | 1 | 2 |
| Mountjoy | Portsmouth | 1 | 2 |
| MPH Construction | Flintshire | 1 | 2 |
| NFC Homes | London | 1 | 2 |
| Sewell Construction | Hull | 1 | 2 |
| Manchester & Cheshire Construction | Salford | 1 | 10 |
| ISG Fit Out | Greater London | 1 | 2 |
| John Graham | London | 1 | 2 |
| Kaberry Construction | Heywood | 1 | 2 |