| A.J. Cornall (Contractors) Limited | Blackpool | 2001 |
| A.J. Cornall (Holdings) Limited | Blackpool | 2015 |
| A.J. Dalby Ltd | Leicestershire | 2006 |
| A.J. Dallas (Joiners) Limited | Inverness-Shire | 2005 |
| A.J. Derrys Cross Developments (Plymouth) Limited | Plymouth | 2022 |
| A.J. Developments Limited | Poole | 2010 |
| A.J. Durrant Building Construction and Development Limited | London | 2012 |
| A.J. Everitt Limited | Leeds | 2005 |
| A.J. Fire Protection and Electricals Ltd | Auchterderran Road | 2021 |
| A.J. Formwork Ltd | West Bromwich | 2026 |
| A.J. GAS and Heating Limited | Rotheram | 2018 |
| A.J. Gollop Contract Flooring Limited | Bristol | 1991 |
| A.J. Gray Building Contractors Limited | Co Fermanagh | 2002 |
| A.J. Hammond (Builders) Limited | Eastbourne | 1975 |
| A.J. Hayton Welding and Fabrication Ltd | Lancashire | 2003 |
| A.J. Haywood Limited | Hove | 2003 |
| A.J. Holden Joinery & Building Limited | Preston | 2005 |
| A.J. Hunter Joinery Limited | Ashton-Under-Lyne | 2006 |
| A.J. Jackson Properties Ltd | Kirkby Stephen | 2006 |
| A.J. Jones Tipper & Grab Hire Ltd | Northampton | 2003 |
| A.J. Kitt Plumbing + Heating Services Limited | Isleworth | 2004 |
| A.J. Lill Building Contractors Limited | Leicester | 2002 |
| A.J. Long Limited | West Midlands | 2003 |
| A.J. Loveland Limited | Rotherham | 1962 |
| A.J. Lowther & SON Ltd | Ross-On-Wye | 1965 |
| A.J. Lumsden & SON Ltd. | Prestonpans | 2019 |
| A.J. Lunn & Co. Limited | Wigston | 2011 |
| A.J. Mcalpine Construction Ltd. | West Kilbride | 2012 |
| A.J. Meddings Quality Bathrooms Ltd | Stafford | 2006 |
| A.J. Mullen Ltd | Salisbury | 2001 |
| A.J. O'Connor Limited | Enfield | 1993 |
| A.J. Paddock & SON Limited | Fawkham, Longfield | 1973 |
| A.J. Pauley Developments Limited | Milton Keynes | 1998 |
| A.J. Pearson Building Limited | Shropshire | 2003 |
| A.J. Philpott & Sons Limited | Stoke-On-Trent | 1979 |
| A.J. Poulton (Epping) Limited | Sheering, Bishop'S Stortford | 1964 |
| A.J. Proctor Builders Limited | Axminster | 2003 |
| A.J. Quinn Building Contractors Limited | Pontypool | 2001 |
| A.J. Rennie Limited | | 2002 |
| A.J. Rice Carpets & Vinyls Ltd | Nottingham | 2023 |
| A.J. Roberts Construction Limited | Leeds | 1964 |
| A.J. Roberts Limited | West Halton Scunthorpe | 2003 |
| A.J. Robson (Electrical) Limited | | 1987 |
| A.J. Rogers Building Limited | Cambridge | 2004 |
| A.J. Sloan Construction Limited | Fishguard | 2022 |
| A.J. Smith Carpentry & Building Contractors Limited | Christchurch | 2002 |
| A.J. Specialist Welding Services Limited | Leicester | 1975 |
| A.J. Steel Erection Services Ltd | Wednesbury | 2016 |
| A.J. Sutherland Ltd | Insch | 2013 |
| A.J. Taylor Electrical Contractors Limited | Hove | 1997 |
| A.J. Taylor Limited | Worcestershire | 1994 |
| A.J. Upton Homes Limited | Solihull | 1998 |
| A.J. Wadhams & Co. Limited | Harlow | 1972 |
| A.J. Wait & Co. Limited | Southend-On-Sea | 1978 |
| A.J. Willcock Holeformers Ltd | Newbury | 1991 |
| A.J. Willson (Properties) Limited | Dunstable | 1963 |
| A.J. Wilson (East Sussex) Limited | Bexhill-On-Sea | 1999 |
| A.J. Wood Limited | Bolton | 2003 |
| A.J.A. Joinery Services Ltd | Hull | 2013 |
| A.J.A. Taylor and Company Limited | Tring | 1922 |
| A.J.B Property Maintenance Services Ltd | Blackpool | 2025 |
| A.J.B. Carpets Limited | Walsall | 2002 |
| A.J.B. Construction (NW) Ltd | Blackburn | 2018 |
| A.J.B. Flooring Limited | Brighton | 2003 |
| A.J.B. Homes and Utilities Limited | Bedford | 2011 |
| A.J.Beaman (Construction) Limited | Stone | 2002 |
| A.J.Brickwork & Builders Ltd | Preston | 2020 |
| A.J.Bryce & SON Joinery Ltd | Edinburgh | 2025 |
| A.J.C Carpentry Ltd | London | 2011 |
| A.J.Collins(Building Contractors)Limited | Haverfordwest | 1960 |
| A.J.Cook Electrical Ltd | Worcester | 2026 |
| A.J.D Conversions Ltd | Bournemouth | 2019 |
| A.J.D Interiors Ltd | Sholing | 2014 |
| A.J.D. Building Services Limited | Maidstone | 2001 |
| A.J.F. Electrical Limited | Stourbridge | 2003 |
| A.J.F. Painting & Decorating Ltd | Maidstone | 2007 |
| A.J.Fortescue & SON Limited | Ashford | 1954 |
| A.J.Francis Flooring Ltd | Burton-On-Trent | 2005 |
| A.J.G. Decorators Ltd | Newcastle Upon Tyne | 2015 |
| A.J.G. Interiors Limited | Wickford | 2021 |
| A.J.H Developments Ltd | Hertford | 2024 |
| A.J.H. (Newtown) Limited | Newton | 1984 |
| A.J.H. Construction Ltd | Burnley | 2015 |
| A.J.H. Contracting Ltd | Burnley | 2002 |
| A.J.H. Property Maintenance Limited | Swadlincote | 2003 |
| A.J.J. Construction Ltd. | Newbury | 2002 |
| A.J.K. (Plant Hire) Limited | Higher Whitley Warrington | 1963 |
| A.J.K. Electrical Services Ltd | Swindon | 2025 |
| A.J.K. GAS Services Ltd | St. Austell | 2020 |
| A.J.L Builders Limited | Palmers Green | 2026 |
| A.J.L. Midlands Electrical Services Ltd | West Midlands | 2006 |
| A.J.L. Roofing Contractors Limited | South Harrow | 2002 |
| A.J.Langford Building and Joinery Services Ltd | Nottingham | 2010 |
| A.J.M Contractors Limited | Clydebank | 2007 |
| A.J.M Property Developments Improvements Ltd | Cardiff | 2025 |
| A.J.M Property Solutions Ltd | Rochdale | 2025 |
| A.J.M. Residential Developments Limited | Peterborough | 2016 |
| A.J.Md Ltd | Northampton | 2025 |
| A.J.N Electrical (Yorkshire) Ltd | Huddersfield | 2010 |
| A.J.O Invest Ltd | London | 2026 |