| A T Cornfield Roofing Ltd | Norwich | 2024 |
| A T Dickison Limited | Leicester | 2003 |
| A T Electric Ltd | London | 2020 |
| A T Electrical & Controls (UK) Ltd | Bromborough | 2006 |
| A T Electrical (Sleaford) Ltd | Sleaford | 2023 |
| A T Eley Restoration Ltd | Telford | 2000 |
| A T Fencing Ltd | Carrickfergus | 2025 |
| A T Flooring Limited | Tonbridge | 2012 |
| A T Floorscreeds Limited | Nottingham | 2014 |
| A T Freeman Building Services Ltd | Crawley | 2021 |
| A T GAS & Plumbing Ltd | Northumberland Road | 2021 |
| A T GAS Services Limited | Nottingham | 2017 |
| A T Green Ltd | Chester | 2006 |
| A T H Tiling & Bathrooms Ltd | Whaley Bridge | 2003 |
| A T Haines Building Limited | Bude | 2017 |
| A T Heating Modules Ltd | Hatfield, Hertfordshire | 2017 |
| A T Highways Ltd | Birmingham | 2026 |
| A T Hope Limited | Reading | 2019 |
| A T Joinery & Construction Ltd | Derry | 2022 |
| A T Joinery (Stockport) Limited | Cheshire | 2003 |
| A T Joinery and Building Services Limited | Nottingham | 2018 |
| A T Jones Building & Damp Proofing Ltd | Holyhead | 2016 |
| A T Jones Building Services Ltd | Northampton | 2023 |
| A T Kitchens & Joinery Ltd | Wirral | 2020 |
| A T L Heating Ltd | Harlech | 2012 |
| A T Leadworks Limited | Lewes | 2017 |
| A T M (Electrical & Building Services) Ltd | Bolton | 2005 |
| A T M (Plumbing and Heating) Limited | Worcester | 2016 |
| A T M Fabrication & Construction Ltd | Ballynahinch | 2006 |
| A T Multi Service Contractors Ltd | Purfleet | 2024 |
| A T Muyiwa Limited | London | 2018 |
| A T Payne Builders Limited | Tongham | 2017 |
| A T Plant Hire UK Ltd | Lichfield | 2001 |
| A T Plastering & Building Limited | Deal | 2014 |
| A T Plumbing & Heating (Lincs) Limited | Scunthorpe | 2019 |
| A T Plumbing & Heating Solutions Ltd | Norwich | 2021 |
| A T Plumbing Solutions Ltd | London | 2024 |
| A T Projects Cumbria Limited | Maryport | 2013 |
| A T R Contracts Limited | Oxfordshire | 2000 |
| A T Roofing Limited | Sheffield | 2022 |
| A T Shearn Electrical Limited | Bristol | 2014 |
| A T Structural Carpentry Limited | Blackpool | 2013 |
| A T Walklett Construction Services Limited | Stanford-Le-Hope | 2026 |
| A T Wearne & Sons (Building Contractors) Limited | Penzance | 2009 |
| A Tanner Limited | Reading | 2006 |
| A Task Limited | Watton-At-Stone | 2019 |
| A Tate Developments Ltd | Otley | 2024 |
| A Tawney Engineering Services Ltd | Huntingdon | 2014 |
| A Taylor Electrical Limited | Stanford-Le-Hope | 2010 |
| A Taylor Electrical Services Ltd | West Malling | 2026 |
| A Taylor Roofing Ltd | Wakefield | 2013 |
| A Taylor Roofing Specialist Ltd | Bolton | 2015 |
| A Taylor Scaffolding Ltd. | Cranbrook | 2014 |
| A Team Adventures Limited | Littleborough | 2021 |
| A Team Build Limited | Malvern | 2023 |
| A Team Construction Cornwall Ltd | Truro | 2024 |
| A Team Construction Ltd | Seven Kings | 2009 |
| A Team Constructionz Limited | Bradford | 2021 |
| A Team Coving Limited | Waterlooville | 2018 |
| A Team Development Ltd | Orpington | 2020 |
| A Team Electrical & Instrumentation Services Limited | Torquay | 2015 |
| A Team Electrical Limited | Kenley | 2016 |
| A Team Electrical Services Limited | Staines-Upon-Thames | 2019 |
| A Team Electrical Solutions Ltd | Hinckley | 2023 |
| A Team Facade Installation Ltd | Dagenham | 2020 |
| A Team Groundworks Ltd | Inverness | 2018 |
| A Team Installations Limited | Dursley | 2004 |
| A Team Insulation Ltd | Cardiff | 2018 |
| A Team Loft Insulations Ltd | Bury | 2024 |
| A Team Lofts & Staircases Limited | Ilford | 2019 |
| A Team Plastering Ltd | Bellshill | 2024 |
| A Team Property Developments Limited | Worthing | 2017 |
| A Team Services MCR Ltd | Manchester | 2024 |
| A Team Storage Solutions Ltd | Littlehampton | 2020 |
| A Tech Heating Limited | Cumbernauld | 2000 |
| A Tech Installs Ltd | Leeds | 2015 |
| A Tech Roofing Consultancy Ltd | Glasgow | 2022 |
| A the Construction Team Ltd | Grays | 2021 |
| A Thermal Ltd | London | 2024 |
| A Thind Ltd | Slough | 2025 |
| A Thoft Consultancy Limited | Cambridge | 2020 |
| A Thomas and Co Limited | Epsom | 2020 |
| A Thomas Plant Hire Limited | Camarthen | 2008 |
| A Thomas Plumbing & Heating Ltd | Gillingham | 2022 |
| A Thomas Property Development Limited | Newport | 2024 |
| A Thompson Installations Ltd | Barnsley | 2007 |
| A Thompson Plumbing & Heating Engineer Ltd | Oldham | 2024 |
| A Thompson Property Services Limited | Halesowen | 2006 |
| A Thomson & SON Ltd | Dornoch | 2011 |
| A Thomson Limited | Carlisle | 2023 |
| A Thomson Plumbing & Heating Services Ltd | Hawick | 2014 |
| A Thorley & SON Limited | Uttoxeter | 2023 |
| A Thornburrow Roofing Limited | Barrow-In-Furness | 2023 |
| A Thousand Trades Ltd | Birmingham | 2026 |
| A Tickhill and Sons Ltd | Prestonpans | 2024 |
| A Tiling Specialist Ltd | Yeovil | 2019 |
| A Tindell Heating Limited | Sidcup | 2022 |
| A TJ Brickwork Limited | Newcastle Upon Tyne | 2026 |
| A to B 5* Services Ltd | Birkenhead | 2021 |
| A to B Construction Limited | Glasgow | 2019 |