| A.T. LEE Properties Limited | Skipton | 2000 |
| A.T. Maintenance & Remedials Limited | Wickford | 2018 |
| A.T. Mclean Driveway, Patio & Groundwork Specialists Ltd | Cumnock | 2026 |
| A.T. Nolan (Building Contractors) Limited | Manchester | 1999 |
| A.T. Palmer (Builders & Contractors) Limited | Ashford | 1954 |
| A.T. Palmer Developments Ltd | Ashford | 2019 |
| A.T. Plastering & Tiling Limited | Stourbridge | 2013 |
| A.T. Projects (Southern) Limited | Cosham | 2014 |
| A.T. Saunders & SON Limited | Kettering | 2010 |
| A.T. Services Air Conditioning & Ventilation Limited | Leicester | 2023 |
| A.T. Services Building Services Maintenance Limited | Leicester | 2023 |
| A.T. Services Limited | Leicester | 1997 |
| A.T. Smith Developments Limited | London | 2003 |
| A.T. Stannard Limited | Sittingbourne | 1998 |
| A.T. Surveying Limited | Cheltenham | 2003 |
| A.T.A. Partitions Limited | Birmingham | 2002 |
| A.T.A.R Signalling Ltd | Basildon | 2014 |
| A.T.B. Plumbing & Building Services Limited | Benfleet | 2002 |
| A.T.B. Site Services Limited | Wakefield | 2015 |
| A.T.C. Design and Build Ltd | Ludlow | 2018 |
| A.T.D Carpentry Ltd | Bramhall | 2013 |
| A.T.E Electrical Engineering Ltd | Shrewsbury | 2013 |
| A.T.E. Fire Protection Limited | Colchester | 1993 |
| A.T.E.M. Limited | Ashford | 2012 |
| A.T.F. Electrical Contractors Ltd | Brighton | 2005 |
| A.T.H Plant and Groundworks Ltd | Shrewsbury | 2020 |
| A.T.H. Plastering Limited | Cannock | 2010 |
| A.T.J. Electrical Services Ltd | Erith | 2019 |
| A.T.James Plumbing & Heating Limited | Stevenage | 2012 |
| A.T.K Build Ltd | Slough | 2021 |
| A.T.L. Electrical Ltd | Newark | 2003 |
| A.T.L.S Services Ltd | Stranraer | 2025 |
| A.T.M Global Ltd | Arbroath | 2021 |
| A.T.M.S. (East Anglia) Limited | Ipswich | 2010 |
| A.T.P. Developments and Investments Limited | London | 2022 |
| A.T.P.Decorations Limited | Hertfordshire | 1964 |
| A.T.R. Contractors & Builders Limited | Preston | 2016 |
| A.T.S Air Testing Solutions and Labouring Ltd | Peterborough | 2019 |
| A.T.S Construction Consultancy Limited | Grimsby | 2025 |
| A.T.S. Utilities & Civils Ltd | Cleckheaton | 2026 |
| A.T.T.Electrical.Services Ltd | London | 2025 |
| A.Taylor Electrical Contracting Limited | Bournemouth | 2023 |
| A.Thomas Properties Ltd | Glasgow | 2019 |
| A.Thompson Building and Construction Ltd | Warlingham | 2022 |
| A.To.Zii Ltd | Altrincham | 2022 |
| A.Ts. Building Services Ltd | Potters Bar | 2020 |
| A.Tyler Plumbing&Bathrooms Limited | Middlesbrough | 2024 |
| A.Tyson Plumbing & Heating Ltd | Grange-Over-Sands | 2022 |
| A.U Electrical Solutions Ltd | Hull | 2025 |
| A.U. Driveway's Experts Ltd | Mansfield | 2024 |
| A.V GAS Core Ltd | London | 2019 |
| A.V. Property Services Limited | Hornchurch | 2009 |
| A.V. Roofing & Cladding Limited | Ammanford | 2024 |
| A.V.A Decorators Ltd | Dartford | 2012 |
| A.V.A Developments Scotland Ltd | Glasgow | 2018 |
| A.V.A Drywall Limited | London | 2025 |
| A.V.A Interiors Ltd | London | 2019 |
| A.V.A Property Solutions Ltd | Dunbar | 2024 |
| A.V.A. Brickwork & Building Specialists Limited | Hockley | 2024 |
| A.V.A. Building & Construction Limited | Borehamwood | 2007 |
| A.V.I Protection Ltd | Rickmansworth | 2023 |
| A.V.M. Electrical Services (Auchterarder) Ltd | Auchterarder | 2023 |
| A.V.Structures Ltd | London | 2020 |
| A.Vernon & Co Ltd | Wallasey | 2014 |
| A.Vickers Electrical Ltd | Gateshead | 2015 |
| A.W Building Services Ltd | Wantage | 2017 |
| A.W Drylining Specialist Ltd | Shoreham-By-Sea | 2021 |
| A.W Roofing (SW) Limited | Plymouth | 2025 |
| A.W Roofing, Welding & Builders Ltd | Stoke-On-Trent | 2023 |
| A.W Sheepwash Electrical Ltd | Whitstable | 2025 |
| A.W Site Services Limited | Wolverhampton | 2024 |
| A.W. & M.R. Abbott Limited | Coalville | 2013 |
| A.W. Builders (South Lakes) Limited | Windermere | 2006 |
| A.W. Coppin Limited | Maidstone | 1960 |
| A.W. Cowan Groundworks Limited | Stockton -On Tees | 1981 |
| A.W. Drilling Services Ltd. | Dartford | 1999 |
| A.W. Eadie Limited | York | 2008 |
| A.W. Electrical Contractors & Engineers Limited | Bournemouth | 2001 |
| A.W. Gordon Limited | Banchory | 2002 |
| A.W. Group Services Ltd | London | 2025 |
| A.W. Hannah Limited | Perth | 2022 |
| A.W. Hardy & Co. Limited | Southend-On-Sea | 1958 |
| A.W. Hockin (Builders) Limited | Bideford | 1988 |
| A.W. Jack Construction Ltd | Inverness | 2013 |
| A.W. Jones Construction Limited | Brecon | 2003 |
| A.W. Lifting Limited | Colchester | 2011 |
| A.W. Moffitt (Joinery) Limited | Richmond | 2003 |
| A.W. Plant Services Limited | Great Yarmouth | 1982 |
| A.W. Taylor (Alresford) Ltd | Alresford | 2002 |
| A.W. Walker (UK) Limited | | 1991 |
| A.W. Webber Contractors Limited | Okehampton | 1999 |
| A.W.C. Electrical Limited | Cheshire | 2001 |
| A.W.Corke and Sons Limited | Halstead | 1961 |
| A.W.E Construction Ltd | London | 2026 |
| A.W.E Kent Ltd | Sittingbourne | 2018 |
| A.W.E. (Anderson Water Equipment) Limited | Newport | 1983 |
| A.W.E. and Sons Limited | Grange-Over-Sands | 2010 |
| A.W.E.S Solutions Limited | Morden | 2019 |
| A.W.Gas Ltd | East Lothian | 2018 |
| A.W.J.Usher & Sons Limited | St. Neots | 1965 |