| A J Civil Constructions Ltd | Hounslow | 2025 |
| A J Clark & SON Limited | Bristol | 2003 |
| A J Clarkson Builders Limited | Poulton-Le-Fylde | 2005 |
| A J Coldicott Limited | Pershore | 2013 |
| A J Colley Ltd | Chatham | 2024 |
| A J Construction & Lifting Ltd | Middlesbrough | 2021 |
| A J Construction (Lurgan) Ltd | Craigavon | 2011 |
| A J Construction (SN) Limited | Cardiff | 2016 |
| A J Construction (UK) Ltd | Erith | 2005 |
| A J Construction (Yorkshire) Limited | Thornhill Dewsbury | 2006 |
| A J Constructions (West Midlands) Ltd | Walsall | 2019 |
| A J Constructions London Ltd | Bedford | 2013 |
| A J Consulting (Suffolk) Ltd | Cambridge, | 2017 |
| A J Contractions Ltd | London | 2026 |
| A J Contractors (NW) Limited | St Asaph | 2025 |
| A J Contractors Ltd | Invergordon | 2020 |
| A J Contracts Limited | St. Ives | 2025 |
| A J Cook Builders (Herts) Ltd | Letchworth Garden City | 2019 |
| A J Cooke & SON Ltd | Northampton | 2007 |
| A J Cooper Plumbing and Heating Services Limited | Ilkeston | 2025 |
| A J Cope Builders Limited | Aylesbury | 2011 |
| A J Court Security Limited | Enderby | 2022 |
| A J Crapnell Ltd | Bradford On Avon | 2017 |
| A J Crews & Co Limited | Cardiff | 1974 |
| A J Cribb Plumbing and Heating Ltd | Preston | 2019 |
| A J Cross Plumbing, Heating and GAS Services Ltd | Macmerry | 2023 |
| A J Curd Electrical Ltd | Worthing | 2022 |
| A J D Decorating Limited | Milton Keynes | 2017 |
| A J D Roofing Limited | South Yorkshire | 2002 |
| A J Dampproofing Ltd | Harrow | 2021 |
| A J Dart Building Contractors Limited | South Molton | 2003 |
| A J Davies & Sons Limited | Oldham | 2012 |
| A J Davis Demolition, Salvage & Plant Hire Ltd | Wincanton | 2000 |
| A J Decorating Limited | Dudley | 2017 |
| A J Decorating Services Limited | Waterlooville | 2014 |
| A J Design Limited | Hyde | 2006 |
| A J Detailing Limited | Marston Lane | 2013 |
| A J Developments (NW) Limited | Bolton | 2015 |
| A J Developments (Scotland) Limited | Laurencekirk | 2021 |
| A J Developments (Staffs) Limited | Stoke On Trent | 2014 |
| A J Dodd Construction Limited | Stalybridge | 2012 |
| A J Donald (Slaters) Limited | Aberdeen | 2008 |
| A J Douce Roofing Ltd | Gainsborough | 2023 |
| A J Doyle Building Services Ltd | Rayleigh | 2001 |
| A J Drewery Electrical Limited | Stowmarket | 2018 |
| A J Drylining Limited | Leighton Buzzard | 2026 |
| A J E Contracting Limited | Nottingham | 2018 |
| A J E Plumbing and Building Ltd | Doncaster | 2022 |
| A J Electrical (Brentwood) Ltd | Brentwood | 2005 |
| A J Electrical (Mold) Limited | Mold | 2003 |
| A J Electrical Cambridge Limited | Oldham | 2019 |
| A J Electrical Contractors Limited | Surrey | 2007 |
| A J Electrical DD Ltd | Etchingham | 2014 |
| A J Electrical Installations (COV) Ltd | Coventry | 2008 |
| A J Electrics (Coleshill) Limited | Birmingham | 1990 |
| A J Engineering UK Ltd | Lincoln | 2004 |
| A J England's Finest Gardens Ltd | Berkeley | 2002 |
| A J Estebanez Services Limited | Merthyr Tydfil | 2019 |
| A J F Contracts (Essex) Ltd | Wickford | 2020 |
| A J F Electrical Services (Midlands) Ltd | Walsall | 2022 |
| A J F Roofing Limited | Insch | 2003 |
| A J Fencing & Landscaping (SW) Ltd | Yeovil | 2022 |
| A J Fenestration Limited | Chelmsford | 2016 |
| A J Field Developments Limited | Crewe | 2001 |
| A J Field Electrical Limited | Deeside | 2008 |
| A J Field Holdings Limited | Deeside | 2014 |
| A J Firth Limited | Wakefield | 2025 |
| A J Fitz Limited | Buntingford | 2015 |
| A J Flooring Limited | Colchester | 2005 |
| A J Flooring NE Ltd | Consett | 2025 |
| A J Fouweather Heating & Plumbing Ltd | Newport | 2002 |
| A J Francis Building Contractors Ltd | Helston | 2021 |
| A J G Installations Limited | Cleckheaton | 2012 |
| A J GAS and Water Limited | London | 2015 |
| A J Gibbs and SON Limited | Worthing | 2008 |
| A J Gleeson Building and Groundworks Limited | Chandler'S Ford | 2013 |
| A J Grace Developments Ltd | Southampton | 2023 |
| A J Grant (Contracting) Ltd | Nethy Bridge | 2012 |
| A J Gray Contracts UK Limited | Glasgow | 2016 |
| A J Green Plumbing Services Limited | Purley | 2003 |
| A J Green Roofing Limited | Uppingham | 2012 |
| A J Griffin Limited | Thame | 2007 |
| A J Griffiths Engineering Limited | Bromyard | 2002 |
| A J Griggs Roofing & Cladding Ltd | Goole | 2025 |
| A J Grimshaw Limited | Ashford | 2007 |
| A J Group Derby Limited | Derby | 1992 |
| A J H Bricklayers Limited | Launceston | 2017 |
| A J H Builders Ltd | Ayrshire | 2003 |
| A J H Building Contractors Limited | Leighton Buzzard | 2016 |
| A J H Metal Roofing and Cladding Ltd | | 2003 |
| A J H Plastering Solutions Ltd | Wigan | 2014 |
| A J H Roofing Limited | Bristol | 2006 |
| A J Hadwin Limited | Millom | 2003 |
| A J Hale & SON Limited | Taunton | 2003 |
| A J Hale Construction Limited | Usk | 2009 |
| A J Hale Electrical Ltd | Braunton | 2017 |
| A J Hall Carpentry & Joinery Ltd | Birmingham | 2006 |
| A J Hardscaping Services Limited | Towcester | 2025 |
| A J Harriman Construction Ltd | Leeds | 2026 |
| A J Harris (Decorating & Home Improvements) Limited | Ipswich | 2003 |