| A. M. Ormerod Heating & Plumbing Limited | Stourport-On-Severn | 2020 |
| A. M. Price & Sons (Construction) Limited | Dudley | 2002 |
| A. M. Webb Joinery Limited | Sudbury | 2014 |
| A. M. Wightman Ltd. | Newark | 2003 |
| A. M. Willis Builders Limited | Winsford | 2004 |
| A. Macgregor & Sons Limited | Taynuilt | 2011 |
| A. Macgregor Joinery Contractor Limited | Oban | 2017 |
| A. Maclean Plastering Ltd. | Inverness | 2003 |
| A. Mainstone Ltd | Poole | 2006 |
| A. Major Building Services Limited | Wolverhampton | 2011 |
| A. Major Plumbing and Heating Ltd | Corby | 2023 |
| A. Mandley Fencing Ltd | Falmouth | 2023 |
| A. Matthews Electrical Contractors Ltd | Southwater, Horsham | 2020 |
| A. Maylen's Traditional Builders Limited | Wickford | 2017 |
| A. MCC Interiors Limited | Cheshire | 2005 |
| A. Mclaren Engineering Ltd | Inverness | 2017 |
| A. Medway Limited | Southampton | 1999 |
| A. Mellor (Demolition) Limited | Wetherby | 2009 |
| A. Mellor (Recycling) Limited | Doncaster | 2009 |
| A. Morgan Groundworks Ltd | Abercynon | 2019 |
| A. Mullen Construction Limited | Leeds | 2018 |
| A. Mullineau Limited | Bury | 2003 |
| A. N. Epps Limited | Ashford | 2002 |
| A. N. Property Services Ltd | Waltham Cross | 2010 |
| A. N. Remmer Builders Ltd | Huddersfield | 2012 |
| A. Nelson (Blackpool) Limited | Blackpool | 2004 |
| A. Nissim Electrical Ltd | Manchester | 2014 |
| A. Noble Electrical Services Ltd | Stockport | 2026 |
| A. O'Neill & SON Limited | Spalding | 2012 |
| A. Osborn & Sons Limited | Braintree | 1924 |
| A. Osborne Electrical Limited | Rochester | 2007 |
| A. P Utility Services & Groundworks Limited | Bristol | 2018 |
| A. P. Bloor Ltd | Wirral | 2021 |
| A. P. Bourne Carpentry & Building Services Limited | Ashford | 2010 |
| A. P. Chapman Decorators Limited | Chelmsford | 2005 |
| A. P. Cooper Refurbishments Limited | Enfield | 2007 |
| A. P. I. Construction Ltd. | New Malden | 2006 |
| A. P. Papworth Ltd | Sawston | 2014 |
| A. P. Site Management Ltd | Rugeley | 2013 |
| A. P. Smith Roofing Limited | Southampton | 2018 |
| A. P. Swan Limited | Redhill | 2006 |
| A. Parker Plumbing Limited | Darlington | 2009 |
| A. Parry Construction Co Limited | Mold | 1991 |
| A. Pattison Contractors Ltd | Sheffield | 2010 |
| A. Petrov Construction Ltd | London | 2019 |
| A. Prime Maintenance Group Ltd | Sheffield | 2025 |
| A. Pro Ltd | Shoreham-By-Sea | 2026 |
| A. Proctor Group Limited | Perthshire | 1987 |
| A. Proctor Insulation Limited | Perthshire | 1986 |
| A. Pugh Electrical Solutions Ltd | Coventry | 2014 |
| A. Purkiss Building & Decorating Contractors Limited | Horsham | 1998 |
| A. R. Barber Garage Doors Limited | Stoke-On-Trent | 2004 |
| A. R. GAS Heating & Plumbing Services Limited | Southend-On-Sea | 2015 |
| A. R. Groundworks & Construction Limited | Portsmouth | 2011 |
| A. R. M. Waste Treatments Limited | Rugeley | 1990 |
| A. R. Smith Builders Limited | Oxford | 1999 |
| A. RAM Roofing & Scaffolding Services Limited | Birmingham | 2007 |
| A. Ridley Plumbing & Heating Ltd | Haywards Heath | 2012 |
| A. Ross Joinery and Building Services Limited | Hamilton | 2009 |
| A. Rotherham Electrical Ltd | Louth | 2020 |
| A. Royden Roofing Services Limited | Dereham | 2010 |
| A. Russell and Sons Ltd | Borehamwood | 2015 |
| A. S Builder's PVT Ltd | Leicester | 2019 |
| A. S. a. Interiors Limited | Hertford | 2010 |
| A. S. Electrical Services (York) Limited | Selby | 2016 |
| A. S. H. (Cambs) Ltd | St. Ives | 2018 |
| A. S. Hall Builders & Contractors Limited | Fakenham | 2009 |
| A. S. Painters Limited | Bredbury | 2017 |
| A. S. Roofing Limited | Northampton | 2021 |
| A. Sanderson Contractors Limited | Lichfield | 2002 |
| A. Sanderson Electrical Ltd. | Edinburgh | 2007 |
| A. Sandham Ltd | London | 2025 |
| A. Scott Services Limited | Derbyshire | 2000 |
| A. Seaton Electrical Ltd | Rushden | 2011 |
| A. Sewell Limited | Hook | 2003 |
| A. Sharman & Sons (Construction) Limited | Norfolk | 1972 |
| A. Sharp Limited | Plymouth | 2002 |
| A. Shaw Slaters and Plasterers Ltd | Paisley | 2017 |
| A. Shires Decor Limited | Fareham | 2017 |
| A. Skeggs Carpentry Limited | Sudbury | 2014 |
| A. Slattery Limited | Newbury | 1997 |
| A. Smith Builder and Decorator Limited | Wallsend | 2005 |
| A. Smith Electrical Services Limited | Driffield | 2015 |
| A. Staddon Groundworks Ltd | Salisbury | 2012 |
| A. Stafford Carpentry & Joinery Limited | Swadlincote | 2006 |
| A. Steel & SON Contracts Limited | Glasgow | 1991 |
| A. Steel Installations Ltd | Birmingham | 2015 |
| A. Stevely Electrical Contractors Limited | Ayrshire | 1995 |
| A. Stewart Plumbing & Heating Services Limited | Taunton | 2026 |
| A. Stubbs & Sons Plumbing & Heating Limited | Nantwich | 2014 |
| A. Sullivan (Builders) Limited | Middlesex | 1986 |
| A. Surman & Co. Limited | Birmingham | 1956 |
| A. Swann and Sons Limited | Sidmouth | 2013 |
| A. T. Decorators Ltd | Staines-Upon-Thames | 2024 |
| A. T. H. Contracts Limited | North Shields | 2016 |
| A. T. Kelsall Plastering Contractors Ltd | Stoke-On-Trent | 2005 |
| A. T. Plumbing and Heating Ltd. | Sherburn In Elmet | 2014 |
| A. T. Plumbing and Heating Services Limited | Gravesend | 2015 |
| A. T. Railway Services Limited | Aberdare | 2012 |
| A. T. S. Property Maintenance Ltd | Harrow | 2021 |