| A.D. Walker Plumbing & Heating Ltd | Uffington | 2013 |
| A.D.A Distribution Ltd | Northampton | 2020 |
| A.D.B Plumbing & Heating Ltd | Waterlooville | 2024 |
| A.D.B. Electrical Services Limited | Gloucester | 2005 |
| A.D.B. Fire Protection Limited | Longfield | 2014 |
| A.D.B. Projects Limited | Waterlooville | 2008 |
| A.D.B. Property Maintenance Ltd. | Motherwell | 2005 |
| A.D.Broughton Limited | Bognor Regis | 1968 |
| A.D.C Construction Ltd | Rugeley | 2025 |
| A.D.C. Analysis Design and Construction Limited | Cross Hands Llanelli | 1978 |
| A.D.D Building and Maintenance Ltd | Dudley | 2026 |
| A.D.D. Plant (Bristol) Limited | Bristol | 2016 |
| A.D.D. Property Services Limited | Cannock | 2020 |
| A.D.E Installations Ltd | Barnsley | 2020 |
| A.D.E Regeneration Properties Ltd | Nottingham | 2021 |
| A.D.E Total Building & Maintenance Ltd | London | 2024 |
| A.D.E. Electrical & Data Cabling Systems Ltd | Wigan | 2007 |
| A.D.E. Electrical and Data Ltd | Walsall | 2011 |
| A.D.E. Electrical Solutions Ltd | Birmingham | 2022 |
| A.D.E. Home Maintenance Solutions Ltd | Gillingham | 2025 |
| A.D.E.P.T. Maintenance Limited | Hook | 2003 |
| A.D.E.V.A. Home Improvements Ltd | Birchington | 2003 |
| A.D.G. Electrical (Kent) Ltd | Maidstone | 2007 |
| A.D.H Builders (Luton) Ltd | Luton | 2025 |
| A.D.H Contractors Ltd | Shaftesbury | 2024 |
| A.D.H Rope Works Ltd. | Blackpool | 2014 |
| A.D.H. Electrical Ltd | Wimborne | 2003 |
| A.D.H. Flooring Limited | Worksop | 2007 |
| A.D.I Builders Ltd | Aberdeen | 2018 |
| A.D.K. Technical Services Limited | Evesham | 1976 |
| A.D.L. Plumbing & Heating Limited | Oxon | 2006 |
| A.D.M Bayern Trade and Finance Limited | London | 2021 |
| A.D.M Build Ltd | Kirkby-In-Furness | 2023 |
| A.D.M Building Services Ltd | Grantham | 2023 |
| A.D.M Electrics Ltd | Renfrew | 2019 |
| A.D.M. Contractors Limited | Helston | 2004 |
| A.D.M.I Doors Limited | Canterbury | 2011 |
| A.D.O Builders Limited | Maidstone | 2021 |
| A.D.P. Management Ltd | Waterlooville | 2003 |
| A.D.P. Truck Ltd | Leicester | 2015 |
| A.D.Properties Limited | Winchester | 1957 |
| A.D.R Scotland Ltd | Carluke | 2021 |
| A.D.R. Installations Limited | Stalybridge | 2004 |
| A.D.R. Roofing & Construction Ltd | Walsall | 2018 |
| A.D.S Groundworks (Highland) Limited | Inverness | 2025 |
| A.D.S Plumbing & Heating SW Ltd | Bath | 2012 |
| A.D.S. Painters & Decorators Limited | Romford | 1999 |
| A.D.S. Partners Limited | Berkshire | 2001 |
| A.D.W Development Solutions Ltd | London | 2023 |
| A.D.X. Construction Ltd | Grays | 2024 |
| A.Daley Joinery Ltd | Renfrew | 2026 |
| A.Daley Plumbing & Heating Ltd | Melksham | 2025 |
| A.Damm Plumbing and Heating Ltd | Banbury | 2025 |
| A.Dedaj Construction Ltd | Grays | 2021 |
| A.Downey Construction Ltd | Cockermouth | 2016 |
| A.Duraku Construction Ltd | London | 2024 |
| A.E Construction and Maintenance Limited | London | 2020 |
| A.E Supply Limited | Oundle | 2019 |
| A.E. & E.A. Hudson Limited | Cambridgeshire | 2003 |
| A.E. & J.C. Roofing Limited | Driffield | 2021 |
| A.E. Adams (Estates) Limited | Bournemouth | 2023 |
| A.E. Ansley (Builders) Limited | Kent | 1972 |
| A.E. Brislee Ltd | Tonbridge | 2007 |
| A.E. Duffield & Sons Limited | Ripon | 1996 |
| A.E. Electrical Installations Ltd | Darlaston | 2012 |
| A.E. Electrical Limited | Bromley | 1997 |
| A.E. Genet Surrey Limited | Chertsey | 2024 |
| A.E. Hughes & Sons (Contracts) Limited | Manchester | 1997 |
| A.E. Money (Investments) Limited | England | 1980 |
| A.E. Springham & SON Limited | Bishop'S Stortford | 2004 |
| A.E.A. Installations Ltd | Ellesmere Port | 2018 |
| A.E.B. Builders Limited | Halesowen | 2023 |
| A.E.Buckley Limited | Sandbach | 2017 |
| A.E.Bullock Limited | Hertfordshire | 1966 |
| A.E.C. (South West) Electrical Limited | Poole | 1988 |
| A.E.C. Airconditioning and Refrigeration Services Ltd | Alfreton | 2014 |
| A.E.C. Electronics Ltd | Bishop'S Stortford | 2013 |
| A.E.F. Realty Ltd | London | 2023 |
| A.E.Horder(Contracting)Limited | Bristol | 1965 |
| A.E.L. Electrical Ltd | Guildford | 2018 |
| A.E.L. Projects Limited | Preston | 2020 |
| A.E.O Construction Ltd | West Bromwich | 2025 |
| A.E.P (NW) Developments Ltd | Blackpool | 2018 |
| A.E.P. (Modular Construction) Limited | Salisbury | 1997 |
| A.E.P. Building Services Limited | Bourne End | 2006 |
| A.E.S Advanced Electrical Systems Ltd | Treorchy | 2020 |
| A.E.S. (Roofing Contractors) Limited | Ankerdine Road Broadwas On Teme | 1976 |
| A.E.S. Electrical Limited | Strathclyde | 1994 |
| A.E.T. Plumbing & Heating Services Limited | Poole | 2012 |
| A.E.Y Carpentry Limited | Chobham | 2015 |
| A.Elliott Heating and Plumbing Limited | Chippenham | 2004 |
| A.Elliott Traffic Management Ltd | Winsford | 2023 |
| A.Evans Installations Ltd | Worcester | 2026 |
| A.Eyland Developments Limited | Enfield | 2026 |
| A.F Property Solutions Ltd | London | 2018 |
| A.F. Builders & Roofing Limited | St Helens | 2018 |
| A.F. Connell Limited | Elland | 1988 |
| A.F. Groundworks Ltd. | Strathaven | 2007 |
| A.F. Hunt (Builders) Limited | Nottingham | 1978 |
| A.F. Myers Plumbing Ltd | Sherborne | 2012 |