| A.R.C. Welding Limited | Peterborough | 2003 |
| A.R.C.S. Environmental Limited | Wickford | 2003 |
| A.R.Cartwright Limited | Nuneaton | 1970 |
| A.R.Clarke (Builders) Limited | Halstead | 1961 |
| A.R.D Plastering and Roofing Limited | Walsall | 2026 |
| A.R.D Windows Doors and Home Improvement Ltd | Derby | 2025 |
| A.R.D. (Mansfield) Limited | Nottinghamshire | 2007 |
| A.R.D. Developments Limited | Gloucester | 2000 |
| A.R.Darvell Limited | Chesham | 1969 |
| A.R.E (Project One) Ltd | London | 2022 |
| A.R.E. Electrical Contractors Ltd | Epsom | 2003 |
| A.R.E. Services Limited | Ashford | 2018 |
| A.R.E.S Consultants Ltd | Wigan | 2018 |
| A.R.F Joinery Limited | Aberdeen | 2014 |
| A.R.G Civils & Surfacing Ltd | Gosport | 2024 |
| A.R.G.M. Engineering Ltd | Walsall | 2013 |
| A.R.G.O Global Solutions Ltd | Dundee | 2013 |
| A.R.H.Tucker & Sons(Cleethorpes)Limited | North East Lincolnshire | 1950 |
| A.R.J. Limited | Ipswich | 2003 |
| A.R.K Electrical Ltd | Invergordon | 2019 |
| A.R.L. Builders & Developers Limited | Walton On The Naze | 2014 |
| A.R.Ludlow Decorating Contractors Limited | Daventry | 2015 |
| A.R.M Tiling Ltd | Sunbury-On-Thames | 2024 |
| A.R.M Work Ltd | Harrow | 2025 |
| A.R.M. Buildings Limited | Rugeley | 1974 |
| A.R.M. Construction Management Limited | Stone | 2016 |
| A.R.M. Estates Limited | Tamworth | 2001 |
| A.R.M. Foundations and Groundworks Ltd | Chester | 2014 |
| A.R.M. Geomatics Limited | Shrewsbury | 2025 |
| A.R.M. Joinery Limited | Preston | 2005 |
| A.R.M. Mechanical Services Ltd | Chislehurst | 2009 |
| A.R.N.S Construction Ltd | London | 2018 |
| A.R.P Carpentry & Construction Ltd | Hollinwood | 2018 |
| A.R.S Design and Build Limited | Staines-Upon-Thames | 2020 |
| A.R.S. Roofing Limited | Newcastle | 2003 |
| A.R.T Decorating Service Ltd | Birmingham | 2025 |
| A.R.T Electrical Ltd | Wakefield | 2013 |
| A.R.T Electrical Systems Ltd | Worthing | 2018 |
| A.R.T Roofing NW Ltd | Port Sunlight | 2026 |
| A.R.T Scaffolding Ltd | Enfield | 2021 |
| A.R.T Scaffolding Services Ltd | Southampton | 2025 |
| A.R.T. Construction Ltd | Portsmouth | 2024 |
| A.R.T. Innovation Services Ltd | Harlow | 2019 |
| A.R.T. Installations Ltd | High Wycombe | 2005 |
| A.R.T. Leisure Limited | Brighton | 2006 |
| A.R.T. Painting & Decorating Ltd | Quedgeley | 2008 |
| A.R.Toms Electrical Services Ltd | Romford | 2019 |
| A.R.W. Plumbing and Heating Ltd | Stowmarket | 2004 |
| A.Randall Installations Ltd | Swindon | 2020 |
| A.Rasa Construction Ltd | Hornchurch | 2023 |
| A.Reid Building Services Limited | Airdrie | 2005 |
| A.Riley Electrical Ltd | Colchester | 2021 |
| A.Roberts Decorators Limited | Clydebank | 2018 |
| A.Roseprojects Limited | London | 2019 |
| A.Russell Brickwork Ltd | Smethwick | 2019 |
| A.S & M.S Builders Ltd | London | 2021 |
| A.S & Sons Design and Build Limited | Aylesbury | 2023 |
| A.S 24/7 Property Management Limited | Plymouth | 2025 |
| A.S Aggregate Ltd | Selby | 2023 |
| A.S Anderson and SON GAS Contractors Ltd | Brighton | 2026 |
| A.S Builder UK. Ltd | Morden | 2018 |
| A.S Builders and Contractors Ltd | London | 2019 |
| A.S Building & Property Solutions Ltd | Buckie | 2025 |
| A.S Building Contractors Bolton Ltd | Bolton | 2016 |
| A.S Construction & Plumbing Contract Limited | Wolverhampton | 2025 |
| A.S Developments Nottingham Ltd | Nottingham | 2026 |
| A.S Drywall Ltd | Leeds | 2023 |
| A.S Electrical Services (South) Ltd | Newbury | 2024 |
| A.S Electrics (Slough) Ltd | Fareham | 2023 |
| A.S Excavations Limited | Bude | 2018 |
| A.S Facade & Fire Protection Specialists Ltd | Birkenhead | 2019 |
| A.S GAS Plumbing and Heating Ltd | Surrey, Kingswood | 2021 |
| A.S Heating Solutions Ltd | Sutton | 2022 |
| A.S Hewitson Electrical Services Ltd | Wrexham | 2007 |
| A.S Installs Ltd | Wellingborough | 2015 |
| A.S Investment Property Ltd | Birmingham | 2024 |
| A.S Manak Roofing Ltd | Birmingham | 2017 |
| A.S Painting Contractors Group Ltd | Leicester | 2025 |
| A.S Paving & Groundworks Ltd | Wigan | 2021 |
| A.S Plumbing & Bathrooms Ltd | Lichfield | 2019 |
| A.S Plumbing & Heating (NW) Ltd | Mold | 2018 |
| A.S Plumbing & Heating Solutions Ltd | Pudsey | 2026 |
| A.S Roofworks Limited | Greenford | 2025 |
| A.S Steel Limited | London | 2025 |
| A.S Trenchless Services Ltd | Belper | 2026 |
| A.S. Ashcroft Limited | Surrey | 1989 |
| A.S. Builders (Yorkshire) Ltd | Bradford | 2014 |
| A.S. Business Services Ltd | Wednesbury | 2024 |
| A.S. Construction & Landscapes Limited | Beckenham | 2020 |
| A.S. Constructions NW Limited | Manchester | 2019 |
| A.S. Contracts Limited | Birmingham | 1993 |
| A.S. Cooke and Company Limited | Gloucestershire | 1952 |
| A.S. Crawford Groundworks Limited | Hawick | 2002 |
| A.S. Design & Build Ltd | Romford | 2024 |
| A.S. Electrical Limited | Essex | 2005 |
| A.S. Homes (Scotland) Limited | Glasgow | 2010 |
| A.S. Multisport Surfaces Limited | Crawley | 2018 |
| A.S. Painting & Decorating Limited | Tamworth | 2012 |
| A.S. Profinterlux Ltd | Watford | 2017 |
| A.S. Properties (Peterborough) Limited | Peterborough | 2016 |