| A.C.A.Building Ltd | Bournemouth | 2025 |
| A.C.Butt(Builders)Limited | Basildon | 1953 |
| A.C.C Intelligence Ltd | Enfield | 2025 |
| A.C.C. (Flooring) Limited | Brighouse | 1986 |
| A.C.D. Electrical Services Limited | Saltash | 2002 |
| A.C.Doctors Limited | Leicester | 2006 |
| A.C.E Buildings Ltd | Huddersfield | 2025 |
| A.C.E Commercial Refinishers Ltd | Forfar | 2021 |
| A.C.E Decorators Ltd | Orpington | 2023 |
| A.C.E Heating and Plumbing WM Ltd | Kingswinford | 2014 |
| A.C.E Plumbing & Heating Solutions Limited | Chesham | 2024 |
| A.C.E. (NW) Ltd | Lancashire | 2005 |
| A.C.E. Installations & Maintenance Limited | Lincoln | 2020 |
| A.C.E. Response Limited | Nottingham | 2010 |
| A.C.E. Roofing Co. Ltd | Upminster | 1998 |
| A.C.E. Solar Green Building Services Ltd | Romford | 2016 |
| A.C.E.D I.T Ltd | Glasgow | 2023 |
| A.C.E.V Ltd | Chigwell | 2018 |
| A.C.F. Painters Ltd | Tunbridge Wells | 2017 |
| A.C.Flooring (Essex) Ltd | Colchester | 2019 |
| A.C.G. Contractors Limited | Southampton | 2014 |
| A.C.H. Contracts Limited | Basildon | 2018 |
| A.C.I Electrical Solutions Ltd | Wolverhampton | 2023 |
| A.C.J Plumbing and Heating Services Ltd | Cirencester | 2025 |
| A.C.Jackson Builders Ltd | Boston | 2018 |
| A.C.Knights Limited | Settle | 2003 |
| A.C.L. Electrical Limited | Chelmsford | 1967 |
| A.C.L. Plastering and Drylining Limited | Southampton | 1991 |
| A.C.L. Scaffold Services Limited | Wembley | 2016 |
| A.C.Lovering Building Contractors Ltd | Ilfracombe | 2023 |
| A.C.M East Ltd | London | 2015 |
| A.C.M Property Developers Ltd | Wrexham | 2025 |
| A.C.M. Construction Limited | Whiteley | 1986 |
| A.C.M.C. Limited | Cradley Heath | 2012 |
| A.C.N Electrical Contractors Ltd | Bilston | 2025 |
| A.C.N. Electrical Services Limited | Milton Keynes | 2016 |
| A.C.Nicholas Limited | Enfield | 1945 |
| A.C.O Heating and Plumbing Limited | Kings Langley | 2016 |
| A.C.P Decorating Ltd | Leeds | 2023 |
| A.C.P. Carpentry Ltd | Norwich | 2010 |
| A.C.Preou Limited | Billericay | 1964 |
| A.C.R Roofing & Home Improvements Ltd | London | 2025 |
| A.C.R. Developments Limited | Kettering | 2003 |
| A.C.R. Plastering Limited | Ossett | 2013 |
| A.C.S GAS Limited | Skegness | 2020 |
| A.C.S Home & Commercial Services Ltd | Redhill | 2025 |
| A.C.S Joinery & Building Limited | Ashbourne | 2016 |
| A.C.S. Electrical Engineers Limited | Grimsby | 2000 |
| A.C.S. Flintshire County Paving Ltd | Spalding | 2018 |
| A.C.S.B Carpentry Limited | Dartford | 2026 |
| A.C.Services (UK) Limited | Leicester | 2001 |
| A.C.T Construction Civils & Consultation Ltd | Doncaster | 2026 |
| A.C.T Construction Services Limited | Tyne & Wear | 2003 |
| A.C.T Heating Ltd | South Shields | 2025 |
| A.C.T Heritage Limited | Inverness | 2014 |
| A.C.T Plumbing Solutions Ltd | Basildon | 2020 |
| A.C.T. Services & Maintenance Limited | Bishop'S Stortford | 1998 |
| A.C.Van Santen & SON Limited | Addlestone | 1959 |
| A.C.W Services Ltd. | Hamilton | 2018 |
| A.C.W. Homes Limited | Ballymena | 2002 |
| A.Call Property Maintenance Limited | Bolton | 2016 |
| A.Cap Investments Limited | London | 2018 |
| A.Cap Management Limited | London | 2018 |
| A.Chalk Developments Ltd | Chippenham | 2020 |
| A.Clements Building Limited | Newport | 2018 |
| A.Cooper Ltd | Rotherham | 2020 |
| A.Copp Building Services Ltd | Weymouth | 2012 |
| A.Crampton Electrical Ltd | Banbury | 2023 |
| A.Cutts Plumbing & Heating Limited | Suffolk | 2002 |
| A.D Access Scaffolding Contractors Ltd | Sheffield | 2007 |
| A.D Brickwork Developments Limited | Bristol | 2003 |
| A.D Building & Construction Ltd | Manchester | 2026 |
| A.D Capital Carpenters Limited | Orpington | 2016 |
| A.D Cordery Plumbing and Heating Limited | Fareham | 2026 |
| A.D Decor Limited | Orpington | 2023 |
| A.D Electrical Solutions Limited | Romford | 2016 |
| A.D London Developments Ltd | London | 2024 |
| A.D Phoenix Ltd | Tredegar | 2025 |
| A.D Plastering Services Ltd | London | 2022 |
| A.D Plumbing & Drainage Ltd | St. Albans | 2022 |
| A.D Professional Painters Ltd | Cardiff | 2019 |
| A.D Property Maintenance (NE) Ltd | Middlesbrough | 2020 |
| A.D Scaffolding Ltd | London | 2019 |
| A.D Site Services Ltd | Telford | 2016 |
| A.D Solutions Associates Ltd | Bristol | 2012 |
| A.D UK Construction Ltd | Hayes | 2024 |
| A.D Valentine Builders Ltd | Kettering | 2014 |
| A.D. Bannister Roofing & Building Ltd | London | 1997 |
| A.D. Build Floors Ltd | Basildon | 2023 |
| A.D. Building Ltd | Plymouth | 2000 |
| A.D. Costa Ltd | Shaftesbury | 2021 |
| A.D. Draughting & Design Limited | Wemyss Bay | 2001 |
| A.D. Jackson Ltd | Darlaston | 2020 |
| A.D. James Ltd. | Colchester | 2006 |
| A.D. Mechanical Services Limited | Portsmouth | 2000 |
| A.D. Plumbing & Heating (North Wales) Ltd | Flintshire | 2018 |
| A.D. Roofing Services Ltd | Prestatyn | 2019 |
| A.D. Services (Home Improvements) Ltd | Birkenhead | 2023 |
| A.D. Summerscales Painting & Decorating Contractors Limited | Cleckheaton | 2010 |
| A.D. Walker Limited | Renfrew | 1964 |