| A.H. Civils & Construction Limited | Northampton | 2025 |
| A.H. Construction & Services Ltd | Mansfield | 2024 |
| A.H. Fibre Limited | Snodland | 2022 |
| A.H. Field (Developers) Limited | Birmingham | 1953 |
| A.H. Harvey & Sons Limited | Wimborne | 1999 |
| A.H. JV Ltd | Poole | 2019 |
| A.H. Manser Limited | Redditch | 2013 |
| A.H. Plumbing and Heating Services Limited | Norwich | 2009 |
| A.H. Shopfitting Limited | Southport | 2009 |
| A.H. Williams Electrical Limited | Neath | 2010 |
| A.H. Willis and Sons Developments Limited | Faringdon | 2015 |
| A.H. Willis and Sons Limited | Faringdon | 2002 |
| A.H. Willis and Sons Property Limited | Faringdon | 2015 |
| A.H.A.Labour Services Ltd | Portsmouth | 2025 |
| A.H.Coatings Limited | Weston-Super-Mare | 2015 |
| A.H.F Air Conditioning Ltd | Leicester | 2026 |
| A.H.F. Projects Limited | Leeds | 2006 |
| A.H.G Electrical Services Limited | Liverpool | 2015 |
| A.H.G. BH13 Ltd | Poole | 2022 |
| A.H.G. Corporate Group Ltd | Neath | 2018 |
| A.H.G. North Dorset Developments Ltd | Poole | 2021 |
| A.H.G. Poole Developments 1 Ltd | Poole | 2022 |
| A.H.G. Poole Developments Ltd | Poole | 2022 |
| A.H.H. Consulting Ltd | Bromborough | 2008 |
| A.H.I. Developments Ltd | Cheltenham | 2003 |
| A.H.L Heating Ltd | Leicester | 2024 |
| A.H.Mason Flooring Limited | Eastleigh | 2019 |
| A.H.P. Brickworks Limited | Ely | 2017 |
| A.H.P. Builders Limited | Mundford | 1975 |
| A.H.Philpot & Sons 2 Limited | Billericay | 2021 |
| A.H.S Building Group Ltd | Bristol | 2021 |
| A.H.S. Construction Limited | Cardiff | 2009 |
| A.H.T Electrical Ltd | Northants | 2006 |
| A.H.U.S. Trenchless Solutions Limited | Newcastle Upon Tyne | 2010 |
| A.Hand Plumbing Limited | Telford | 2015 |
| A.Holden's Limited | Cumbria | 2002 |
| A.Hollins Ltd | Pontefract | 2020 |
| A.I Contractors Lancashire Limited | Burnley | 2023 |
| A.I Electric Services Limited | Bromley | 2023 |
| A.I Electrical Services Walton Ltd | Walton-On-Thames | 2020 |
| A.I Facilities Management Ltd | Rotherham | 2025 |
| A.I. Access Ltd | Bathgate | 2019 |
| A.I. Contractors Ltd. | Chigwell | 2026 |
| A.I. Heating and Plumbing Limited | Halifax | 2022 |
| A.I. Tonnar Limited | Dumfries & Galloway | 2001 |
| A.I.A. Services Limited | Staffordshire | 1991 |
| A.I.D Builders Ltd | Bradford | 2024 |
| A.I.D. Fitters Limited | London | 2010 |
| A.I.F Plastering Ltd | Durham | 2024 |
| A.I.G. Invest Ltd | Rugby | 2025 |
| A.I.Gatrell Limited | Chandlers Ford | 1965 |
| A.I.M Access Solutions Ltd | Kirkby Liverpool | 2007 |
| A.I.M Decorating Ltd | Harrogate | 2016 |
| A.I.M Flooring Solutions Ltd | Chesterfield | 2023 |
| A.I.M Plant Operators Ltd | Cambridge | 2020 |
| A.I.M Property Improvements Ltd | London | 2020 |
| A.I.M. Building Services (Kent) Limited | Rochester | 2022 |
| A.I.M. Plant Limited | Gravesend | 2019 |
| A.I.M.S.Construction Limited | York | 1972 |
| A.I.O Group Ltd | Maidstone | 2021 |
| A.I.P Spray Painting Limited | Leeds | 2026 |
| A.I.P. (Ashfield Road and Ellerbeck Lane) Limited | Ellesmere Port | 2014 |
| A.I.P. (Church Street) Limited | Ellesmere Port | 2014 |
| A.I.P. (Derwent Riverside) Limited | Ellesmere Port | 2014 |
| A.I.R Cladding Ltd | Pontypool | 2021 |
| A.I.R. Loft Conversion Ltd | Mitcham | 2024 |
| A.I.R. Site Services Limited | Crewe | 2015 |
| A.I.V Construction Ltd | Pinner | 2014 |
| A.Ingram Builders Limited | Bromsgrove | 2017 |
| A.Iqbalandsonsbuilders Ltd | Stockport | 2024 |
| A.J Homes and Developments Ltd | Shoreham-By-Sea | 2024 |
| A.J Builders (UK) Ltd. | Nottingham | 2013 |
| A.J Cartwright Property Limited | Walsall | 2023 |
| A.J Cooper (Builders) Ltd | Norwich | 2002 |
| A.J Dawson Joinery Ltd | Crieff | 2026 |
| A.J Electrical (Poole) Limited | Dorset | 2005 |
| A.J GAS & Plumbing Services Ltd | London | 2024 |
| A.J Land Solutions Ltd | Swindon | 2025 |
| A.J Marine Engineering Services Ltd | Alness | 2014 |
| A.J Master Builders Ltd | Basingstoke | 2019 |
| A.J Millward Property Solutions Ltd | Rotherham | 2017 |
| A.J Roof Repairs & Renovations Ltd | Leicester | 2024 |
| A.J Roofing & Property Maintenance Ltd | Leicester | 2021 |
| A.J Slater Building and Stonemasonry Ltd | Preston | 2025 |
| A.J. & B.A. Marsh Limited | Lancs | 2002 |
| A.J. & C. Electrical Contractors Limited | Cranbrook | 2002 |
| A.J. & J.J. Readman Limited | Northallerton | 2003 |
| A.J. & M.R. Terry Limited | Bognor Regis | 2002 |
| A.J. Barber Limited | Tring | 1996 |
| A.J. Bathrooms Ltd | Worthing | 2014 |
| A.J. Beaumont Limited | Rotherham | 2016 |
| A.J. Beer & Company Limited | Liverpool | 2001 |
| A.J. Block Paving Contractors Limited | Northampton | 1987 |
| A.J. Briffa Brickwork Ltd | Manchester | 2017 |
| A.J. Bryce Joinery & Tiling Ltd. | Edinburgh | 2012 |
| A.J. Building Services Limited | Tunbridge Wells | 2002 |
| A.J. Burton (Construction) Limited | Liphook | 1990 |
| A.J. Carter Ltd. | Loughborough | 2011 |
| A.J. Clancy (Developments) Limited | Randalstown | 1998 |
| A.J. Clarke Demolitions (M/C) Limited | Oldham | 1966 |