| Alan Cahoon Enterprises Limited | Belfast | 2017 |
| Alan Cameron Building Services Ltd | West Rainton | 2016 |
| Alan Camley Limited | Peterhead | 2005 |
| Alan Carmichael Joinery Limited | Oban | 2024 |
| Alan Carnall Windows Limited | West Yorkshire | 1994 |
| Alan Carroll Crane Services Ltd | St. Neots | 2021 |
| Alan Chambers Electrical Ltd | Ilkeston | 2003 |
| Alan Chapman Company Ltd | Chesterfield | 2002 |
| Alan Clancy Drylining Limited | Plymouth | 2020 |
| Alan Clark Ltd | New Malden | 2017 |
| Alan Clark Slating Ltd | Aberdeen | 2023 |
| Alan Clarke Electrical Ltd | Wisbech | 2012 |
| Alan Clarke Joinery Works Limited | Belfast | 2002 |
| Alan Clews Groundworks Limited | Leamington Spa | 2020 |
| Alan Collins Limited | Shaftesbury | 2015 |
| Alan Concannon Electrics Limited | Stalybridge | 2015 |
| Alan Conisbee and Associates Limited | | 2000 |
| Alan Cooper Electrical Services Ltd | Inverurie | 2025 |
| Alan Cousins Roofing Ltd | Dartford | 2024 |
| Alan Craig Limited | Kendal | 2003 |
| Alan Cruickshank Ltd. | Aberdeenshire | 2003 |
| Alan Dainty Building Limited | Hayling Island | 2003 |
| Alan Darby Carpentry Limited | Newcastle | 2002 |
| Alan Dart Groundworks Limited | South Molton | 2006 |
| Alan Davis (Building Services) Limited | Chichester | 1997 |
| Alan Dean Limited | London | 2014 |
| Alan Design Concept Limited | Ellesmere Port | 2015 |
| Alan Devine Roofing Ltd | Glasgow | 2018 |
| Alan Dickinson Ltd | Preston | 2013 |
| Alan Dickson Ltd | Glasgow | 2013 |
| Alan Dixon Plumbing & Heating Ltd | Keighley | 2016 |
| Alan Dobbie Glass and Glazing Ltd | Kirknewton | 2021 |
| Alan Dodd (Plumbing Contractors) Limited | Llangollen | 2003 |
| Alan Donald Limited | Aberdeenshire | 2005 |
| Alan DOW Investments Limited | Stonehaven | 2016 |
| Alan Durkan & Sons Ltd | London | 2002 |
| Alan Electrical Services (North East) Limited | Inverurie | 2010 |
| Alan Elite Decorators Ltd | London | 2025 |
| Alan Elsdon Ltd | Newcastle Upon Tyne | 2026 |
| Alan Evans Projects Ltd | Chester | 2026 |
| Alan Fairhurst Construction Limited | Wigan | 2019 |
| Alan Farrar & SON Ltd | Lymington | 2025 |
| Alan Ferguson Limited | Glasgow | 2014 |
| Alan FEW & Co Ltd | Basildon | 2005 |
| Alan Finish & Seal Group Ltd | Dewsbury | 2026 |
| Alan Fleming Plastering Services Limited | Erskine | 2014 |
| Alan Fletcher Heating & Plumbing Services Ltd | Northolt | 2018 |
| Alan Franklin Builders Ltd | Manchester | 2003 |
| Alan Frazer Limited | Tyne & Wear | 2003 |
| Alan Fuller Plumbing & Heating Limited | Bracknell | 2017 |
| Alan Gumbrell Thatching Ltd | Pewsey | 2011 |
| Alan Haddow Contracts Limited | Lesmahagow | 2015 |
| Alan Hadwin Ltd | Kirkby-In-Furness | 2011 |
| Alan Hall Plumbing and Bathroom Services Ltd | Cramlington | 2022 |
| Alan Hancock Aluminium Doors & Windows Limited | Swansea | 2009 |
| Alan Hannah Electrical Services Ltd | Larkhall | 2013 |
| Alan Harris Plumbing & Heating Ltd | Swanage | 2013 |
| Alan Harrison Limited | Stanhope | 2019 |
| Alan Hill (Plumbing & Heating) Limited | Newcastle Upon Tyne | 1996 |
| Alan Hill Services Limited | Ashford | 2023 |
| Alan Hill Window Systems Limited | Caerphilly | 2014 |
| Alan Hillman Building Contractors Limited | Exmouth | 2012 |
| Alan Hirst & SON Limited | Leicestershire | 2003 |
| Alan Hodge Joiners Ltd | Kirkcaldy | 2018 |
| Alan Howard & Sons Limited | Ormskirk | 2018 |
| Alan Howarth (Primary Care) Limited | Lowestoft | 2003 |
| Alan Howarth Limited | Suffolk | 1988 |
| Alan Hughes Site Services Limited | Glasgow | 2016 |
| Alan Hynd Joiners & Building Contractors Limited | Dunfermline | 2006 |
| Alan International TEC Ltd | Birmingham | 2023 |
| Alan Irving (Contractors) Limited | Birmingham | 2010 |
| Alan J B Robertson Ltd | Inverness | 2015 |
| Alan J Cluett Ltd | Motcombe | 2011 |
| Alan J Gardner Glazing Limited | Harpenden | 2024 |
| Alan J Taylor Engineering Ltd | Manchester | 2023 |
| Alan Jamieson Site Services Ltd | Orpington | 2016 |
| Alan John King Limited | Stowmarket | 2011 |
| Alan Johnson Limited | London | 2002 |
| Alan Jones Building Contractor Ltd | Birmingham | 2013 |
| Alan Jones Site Management Limited | Northwich | 2009 |
| Alan Joy Windows Ltd | Melksham | 1999 |
| Alan Kearns (Building Contractors) Limited | Liverpool | 2008 |
| Alan Keith - J M R Electrical Contractors Ltd | Wallsend | 2006 |
| Alan Kell Plumbing & Heating Engineers Ltd. | Barrow-In-Furness | 2003 |
| Alan Kemp Electrical Limited | Bury St Edmunds | 2011 |
| Alan Kinghorn & SON Plumbing & Heating Ltd | Edinburgh | 2016 |
| Alan Kirk Plumbing & Heating Ltd | Dumfries | 2016 |
| Alan Kitching Developments Ltd | North Yorkshire | 2006 |
| Alan Lancaster Limited | Enfield | 2003 |
| Alan Leighton (Hull) Limited | Brough | 1985 |
| Alan Lever GAS Services Limited | Witney | 2002 |
| Alan Locke Joiners Limited | Glasgow | 2004 |
| Alan Loft Conversions Ltd | London | 2020 |
| Alan Louth Plumbing and Heating Services Ltd | Boston | 2025 |
| Alan Lyons Limited | Portrush | 2018 |
| Alan Maher Electrical Contractors Limited | Kingsbridge | 2008 |
| Alan Marble Stone Limited | London | 2019 |
| Alan Maris Windows Limited | Chesterfield | 2008 |
| Alan Marsden Decorators Limited | Preston | 2007 |
| Alan MAY Rail Ltd | Manchester | 2017 |