| A. & J. Stephen Limited | Perth | 1961 |
| A. & J. Woolf Properties Limited | Lydney | 1964 |
| A. & K. Henry Limited | Eyemouth | 2006 |
| A. & M. Insulations Limited | St. Helens | 2015 |
| A. & M. Procter Limited | Paignton | 1960 |
| A. & M.E. Sawdon & SON Ltd | North Yorkshire | 2003 |
| A. & N. Lewis Limited | Ely | 1987 |
| A. & O. Properties Limited | Woking | 1988 |
| A. & P. Builders Limited | Wellingborough | 2000 |
| A. & P. Joiners & Builders Ltd. | Newcastle Upon Tyne | 2003 |
| A. & S. Coker Ltd | Maldon | 2006 |
| A. & S. Schofield Builders Limited | Bolton | 1998 |
| A. & T. Flooring Limited | London | 1974 |
| A. 1. Alston Roofing Services Limited | Solihull | 2001 |
| A. a. E. Leic Ltd | Leicester | 2024 |
| A. Alderson Electrical Ltd | Kirkby Stephen | 2021 |
| A. Alexander & SON (Electrical) Limited | | 1962 |
| A. Allisters Limited | Chelmsford | 2023 |
| A. and J. Beattie Limited | | 1982 |
| A. and R. Bruce Limited | Sandy | 1987 |
| A. and R. Porter Limited | Hook | 1970 |
| A. Andrews & Sons (Marbles & Tiles) Limited | Leeds | 1936 |
| A. Archer Electrical Limited | Mansfield | 1989 |
| A. Aspden Limited | Lancashire | 2006 |
| A. Aulton Decor Ltd | Cannock | 2022 |
| A. B. Carpentry Limited | Burton Latimer | 2011 |
| A. B. Cholerton Limited | Derby | 1983 |
| A. B. Construction (West Midlands) Limited | Wolverhampton | 1982 |
| A. B. P. Plasterers Limited | Bradford | 1997 |
| A. B. S. General Builders Limited | Wantage | 2025 |
| A. Bailey Roofing Ltd | Hollinwood | 2019 |
| A. Ballard Limited | Reading | 2017 |
| A. Banger Limited | London | 2023 |
| A. Barrell Limited | Horsham | 2005 |
| A. Bartlett (General Building) Limited | Witney | 2003 |
| A. Benson Properties Limited | Morpeth | 2007 |
| A. Best Electrical Limited | Southam | 2002 |
| A. Bladon Ltd | Stourbridge | 2006 |
| A. Brown Plumbing and Heating Ltd | Nuthall | 2013 |
| A. Bryan Builders Limited | Reading | 2003 |
| A. Buchanan Contractors Limited | Guildford | 1994 |
| A. Bunton Building Contractors Limited | Tunbridge Wells | 2008 |
| A. Burnham Carpentry Ltd | Teignmouth | 2003 |
| A. Burrell & Sons Limited | Doncaster | 1986 |
| A. C. Badlan Limited | Cradley Heath | 2002 |
| A. C. Burn Electrical Contractors Limited | Bodmin | 2005 |
| A. C. E. Electrical Contracting Company Limited | Usk | 1996 |
| A. C. Eales Construction Limited | Leigh On Sea | 2004 |
| A. C. Electrical & Security Services Ltd | Telford | 2008 |
| A. C. Emmerson Joinery Limited | Chester Le Street | 2002 |
| A. C. Harding Limited | | 1985 |
| A. C. Joiner's Limited | Colne | 2014 |
| A. C. Joinery & Building Ltd. | Brighouse | 2019 |
| A. C. Plant Limited | Sutton | 2005 |
| A. C. Read Electrics Ltd | Croydon | 2002 |
| A. C. White Limited | Reading | 2021 |
| A. Calver (Electrical) Ltd | Suffolk | 2003 |
| A. Campbell Construction Limited | West Malling | 1985 |
| A. Carey & SON Limited | Manchester. | 1963 |
| A. Carling Plastering Services Ltd | Middlesbrough | 2023 |
| A. Carter Developments Limited | Margate | 2025 |
| A. Carter Electrical Limited | Derby | 2001 |
| A. Chamberlain Combination Contracting Ltd. | Lincoln | 2011 |
| A. Commane Builders Limited | London | 2005 |
| A. Connolly Limited | Wigan | 1999 |
| A. Cornish & Co. Limited | Crowthorne | 1981 |
| A. Corrie Builders Limited | Bletchley | 2011 |
| A. Covey Property Maintenance Ltd | Colchester | 2023 |
| A. Cowley Construction Ltd | Wednesbury | 2022 |
| A. Crabtree (Plumbing & Heating) Limited | Bradford | 2005 |
| A. Cumberlidge Limited | Sheffield | 1974 |
| A. D Building & Maintenance Ltd | Hoddesdon | 2017 |
| A. D. (Southern) Limited | Southampton | 2010 |
| A. D. Co (Scotland) Limited | West Calder | 1992 |
| A. D. Construction Limited | Brighton | 1996 |
| A. D. Decorators Limited | Stroud | 2006 |
| A. D. General Building Ltd | London | 2019 |
| A. D. Leggett Limited | Northampton | 2024 |
| A. D. Premier Plumbing & Heating Ltd | Eastbourne | 2010 |
| A. D. Projects Carpentry Ltd | Swindon | 2008 |
| A. D. Property Maintenance Limited | Newcastle Upon Tyne | 2007 |
| A. D. Resources (INT) Ltd | Southend-On-Sea | 2018 |
| A. Dale Builders Limited | Newbury | 1986 |
| A. Dawber Limited | Burton On Trent | 2000 |
| A. Dawson Roofing Services Ltd | Kirkcaldy | 2020 |
| A. DE Cecco, Limited | Glasgow | 1938 |
| A. DEE Roofing Ltd | Tipton | 2022 |
| A. Dingwall Ltd. | Inverness | 2003 |
| A. Dodd & SON (Construction) Limited | Berkhampstead Road Chesham | 1973 |
| A. Doran Plant Limited | Harrow | 1983 |
| A. Douglas Construction (North East) Ltd | Newcastle Upon Tyne | 2018 |
| A. Driza Ltd | Oldham | 2024 |
| A. Dukes Builders Limited | York | 2002 |
| A. E. Building Services (Lancs) Limited | Bury | 2013 |
| A. E. Heating Limited | Liverpool | 2018 |
| A. E. Rowlands Plant Hire Limited | Mold | 2006 |
| A. E. Smith Plumbing & Heating Ltd | Wymondham | 2026 |
| A. EB Heating & Plumbing Services Limited | Tunbridge Wells | 2009 |
| A. Edmeades & SON Limited | Harlow | 2008 |
| A. Edwards Decorating Solutions Ltd | Fareham | 2017 |