| A.S. Scaffolding (Services) Ltd. | Glasgow | 2004 |
| A.S. Thompson Limited | Derby | 1989 |
| A.S. Unique Home Ltd | London | 2026 |
| A.S. Wagstaff Services Ltd | Walsall | 2023 |
| A.S. West Ltd | Rochford | 2008 |
| A.S. Windows & Doors Ltd | Exeter | 2022 |
| A.S.A Birmingham Ltd | Birmingham | 2021 |
| A.S.A Heating & Plumbing Ltd | High Wycombe | 2011 |
| A.S.A Reinforcement Limited | Yarmouth | 2017 |
| A.S.A. Installations Limited | Kingswinford | 1998 |
| A.S.A. Services NW Limited | Ormskirk | 2011 |
| A.S.A.P Construction Ltd. | Loughton | 1988 |
| A.S.A.P. Painting & Decorating Contractors Ltd | Dunstable | 2018 |
| A.S.A.P. Plumbing (Bucks) Limited | Penn | 2003 |
| A.S.B Plumbing Services Ltd | Exeter | 2023 |
| A.S.B. Roofing & Maintenance Limited | Wakefield | 2012 |
| A.S.Beckwith Ltd | Liverpool | 2026 |
| A.S.Bell Limited | Gillingham | 2010 |
| A.S.Burke Property Limited | Nottingham | 2023 |
| A.S.C Fire Protection Ltd | Washington | 2024 |
| A.S.Crocker(Plasterers)Limited | Darlington | 1956 |
| A.S.D Painting & Decorating Ltd | Kidderminster | 2022 |
| A.S.D.Alderton & Co.Limited | Cambridge | 1972 |
| A.S.E Decor Services Ltd | Gillingham | 2026 |
| A.S.E. Design and Build Ltd | Kingston Upon Thames | 2014 |
| A.S.E. Developments Limited | Waterlooville | 2022 |
| A.S.E. Inspection Ltd | Hull | 2015 |
| A.S.Electrics Limited | Stoke-On-Trent | 2008 |
| A.S.F. Contracts Ltd | Harlow | 2015 |
| A.S.G. Windows and Repairs Limited | Nantwich | 2021 |
| A.S.H. Bricklaying Limited | Leicester | 2018 |
| A.S.H. Building Limited | Rawtenstall | 2004 |
| A.S.H. Electrical (Sussex) Ltd | West Sussex | 2006 |
| A.S.H. Plumbing Heating Ltd | Leicester | 2012 |
| A.S.K Brickwork Ltd | Manchester | 2023 |
| A.S.K Electrical Ayrshire Limited | Kilmarnock | 2017 |
| A.S.K Fisher Plumbing & Heating Ltd | Cleethorpes | 2023 |
| A.S.K Heating Services Ltd | Ipswich | 2017 |
| A.S.K Plant Hire Ltd | Dunecht | 2019 |
| A.S.K. Builders (King's Lynn) Limited | Downham Market | 2022 |
| A.S.K. Construction Services Ltd | Liverpool | 2001 |
| A.S.K. Diamond Drilling Ltd | Northfleet | 2015 |
| A.S.K. Electrician's. Ltd | Airdrie | 2022 |
| A.S.K. Home Improvement Services Limited | Kingsbury | 2026 |
| A.S.K. Home Improvements Limited | London | 2003 |
| A.S.K. Joinery Ltd | Blackburn | 2016 |
| A.S.L Corporation Ltd | Hounslow | 2026 |
| A.S.L Management Consulting Ltd | Hemel Hempstead | 2022 |
| A.S.L Utilities Ltd | Chester Le Street | 2023 |
| A.S.L. (Surrey) Ltd | Coulsdon | 2023 |
| A.S.L. Building Services Ltd | Staffordshire | 2006 |
| A.S.L. Instruments Limited | Warrington | 2024 |
| A.S.L. Limited | Guildford | 1998 |
| A.S.Lally Ltd | Birmingham | 2021 |
| A.S.Lee (Glazing) Company Limited | London | 2002 |
| A.S.M Fire Solutions Ltd | Shefford | 2026 |
| A.S.M Windows Limited | Stevenage | 2019 |
| A.S.M. Carpentry & Joinery Limited | Chichester | 2014 |
| A.S.M. Engineering Limited | London | 1980 |
| A.S.P Cladding Ltd | Birmingham | 2021 |
| A.S.R Contracts Limited | Bishopton | 2016 |
| A.S.R. Construction UK Limited | Middlesex | 2001 |
| A.S.W Building Services Ltd | Pontefract | 2024 |
| A.Salter Electrical Ltd | Telford | 2024 |
| A.Sav Construction Limited | London | 2025 |
| A.Sharkey Roofing and Roughcasting Ltd | London | 2022 |
| A.Shrubb Ltd | East Grinstead | 2024 |
| A.Simpson Air Conditioning Services Limited | Stoke-On-Trent | 2013 |
| A.Sloggett Construction Ltd | Bourne End | 2022 |
| A.Smith & Sons (Building) Limited | Essex | 1991 |
| A.Smith Roofing Ltd | Stoke-On-Trent | 2019 |
| A.Specms Limited | Pentraeth | 2015 |
| A.Spurrier Construction Ltd | Burton-On-Trent | 2022 |
| A.Sterling Joinery Ltd | Newcastle Upon Tyne | 2018 |
| A.Stone Brickwork Ltd | Tunbridge Wells | 2021 |
| A.T & Jackson Services Ltd | Nottingham | 2020 |
| A.T Brickwork (Midlands) Ltd | Tamworth | 2025 |
| A.T Buildex Construction Ltd | Gravesend | 2023 |
| A.T Construction NO.1 Ltd | Middlesex | 2025 |
| A.T Groundworks and Civils Limited | Doncaster | 2026 |
| A.T Maintenance Services Ltd | London | 2024 |
| A.T Prevention Ltd | Oldham | 2023 |
| A.T Surfacing Ltd | Leicester | 2025 |
| A.T Tiling NE Ltd | Newcastle Upon Tyne | 2019 |
| A.T. (Ireland) Limited | Newtownabbey | 2000 |
| A.T. Butler Limited | Lancashire | 2003 |
| A.T. Construction & Maintenance Co. Ltd | Durham | 2004 |
| A.T. Construction Services Limited | Portsmouth | 2007 |
| A.T. Consultants & Builders Limited | Ely | 2014 |
| A.T. Decorating Limited | Birmingham | 2003 |
| A.T. Electrical Contractors Ltd | Leeds | 2018 |
| A.T. Electrical Services & Installations Limited | Wisbech | 2005 |
| A.T. Electrics (SW) Limited | Okehampton | 2023 |
| A.T. Engineering Ltd | Larne | 2013 |
| A.T. Europe Ltd | Craigavon | 2026 |
| A.T. Horgan Joinery Ltd | Lincoln | 2003 |
| A.T. Ince Builders Ltd | Manchester | 2003 |
| A.T. Jenkins Limited | Bourne | 1964 |
| A.T. Jones & SON Limited | Fareham | 1976 |
| A.T. Knott & Sons Limited | Redhill | 1999 |