| A Kimberley Contracting Limited | Newcastle Under Lyme | 2026 |
| A Kincade Electrical Limited | Long Eaton | 2019 |
| A King & SON (Auchterarder) Limited | Edinburgh | 1982 |
| A Kirkwood Brickwork Limited | Halifax | 2021 |
| A Kirson Building & Roofing Services Limited | Wishaw | 2009 |
| A Kitching and Sons Ltd | Ripon | 2014 |
| A Knights Plumbing Ltd | Leiston | 2024 |
| A Kocak Electrical Ltd | Longbenton | 2018 |
| A Kocsis TM Ltd | Coventry | 2024 |
| A Kola Construction Ltd | Woodford Green | 2014 |
| A Kola Home Services Ltd | Richmond | 2019 |
| A Kopa Construction Limited | Dartford | 2016 |
| A L a Services Limited | Newark | 2023 |
| A L Access & Labour Ltd | Inverness | 2016 |
| A L Builders (Kent) Ltd | Herne Bay | 2019 |
| A L Building Services Ltd | London | 2022 |
| A L C Property Development Ltd | Tamworth | 2023 |
| A L C Renovations Ltd | Paignton | 2026 |
| A L Construction (Holmfirth) Limited | Holmfirth | 2006 |
| A L Constructions Hudd Ltd | Shipley | 2021 |
| A L Contracts (N.I.) Ltd | Moira | 2012 |
| A L Cornish Limited | Banbury | 2017 |
| A L D S Management Limited | Benfleet | 2018 |
| A L Decorating Ltd | Lightwater | 2023 |
| A L Electrical Contractors Limited | Batley | 2013 |
| A L Electrics Ltd | Melton Mowbray | 2012 |
| A L Flooring Ltd | Sheffield | 2021 |
| A L G Kitchens and Bathrooms Limited | Sittingbourne | 2014 |
| A L H Plumbing & Heating Services Limited | London | 2024 |
| A L Haine Plumbing & Heating Limited | Bexley | 2012 |
| A L Hill Plant Hire Ltd | Market Harborough | 2003 |
| A L Home Improvements Ltd | Beare Green | 2026 |
| A L Hydrojetting Limited | Gateshead | 2019 |
| A L I Stone Limited | Slough | 2021 |
| A L J Group Limited | Derby | 2020 |
| A L Lacy & Sons Limited | Didcot | 2005 |
| A L Leadworks & Roofing Ltd | Verwood | 2020 |
| A L M Chapman Limited | Benfleet | 2013 |
| A L M Concepts & Design Ltd | Manchester | 2019 |
| A L M Partitioning Limited | Cambridgeshire | 2006 |
| A L N Construction Ltd | Edgware | 2019 |
| A L Perrie Ltd. | Glasgow | 2008 |
| A L Plumbing & Heating Limited | Kilmarnock | 2001 |
| A L Projects and Developments Ltd | London | 2026 |
| A L Renovations Ltd | Manchester | 2025 |
| A L Robins Partitioning & Suspended Ceiling Ltd | Cwmbran | 2024 |
| A L Robinson Building Limited | Middlesbrough | 2013 |
| A L Roofing & Cladding Ltd | Carnoustie | 2025 |
| A L Roofline Ltd | Stourbridge | 2025 |
| A L Rouse Ltd | Didcot | 2018 |
| A L S Civil Engineers Ltd. | Ramsgate | 1967 |
| A L S Construction Management Ltd | Broadstairs | 2018 |
| A L S Facilities Ltd | Billericay | 2014 |
| A L S Services Ltd | London | 2022 |
| A L Scaffolding Limited | Herne Bay | 2012 |
| A L Shand Ltd | Bexhill-On-Sea | 2025 |
| A L T Roofing Solutions Limited | Westerham | 2025 |
| A L Testing Services Limited | Great Dunmow | 2014 |
| A L Wicken Carpenter & Building Contractors Limited | Clacton-On-Sea | 2004 |
| A L Wild Electrical Ltd | Sheffield | 2016 |
| A L Williams Construction Limited | Droitwich | 2002 |
| A L Williams Electrical Ltd | Ruthin | 2017 |
| A Ladies Touch Limited | Chippenham | 2024 |
| A Lake Electrical Services Ltd | Barry | 2021 |
| A Lama Construction Ltd | Enfield | 2021 |
| A Lane & Associates Limited | Blackwood | 2005 |
| A Lane Developments Limited | Blackwood | 2018 |
| A Latham Building Services Ltd | Stroud | 2012 |
| A Lawson Building Maintenance Limited | Barnsley | 2017 |
| A Lawton Building Services Ltd | Halifax | 2021 |
| A Lawton Properties Limited | Devizes | 2026 |
| A LEE & Sons Building & Groundwork Ltd | Hemel Hempstead | 2019 |
| A LEE Construction Services Limited | Durham | 2026 |
| A LEE Contracting Limited | Basildon | 2011 |
| A LEE Engineering Limited | Carlisle | 2019 |
| A LEE Plastering Limited | Exeter | 2021 |
| A Lees & SON Limited | Leicester | 2015 |
| A Lees Bricklaying Contractors Southern Limited | Gosport | 2023 |
| A Legacy Electrical Ltd | Harlow | 2020 |
| A Leigh Agricultural and Countryside Management Limited | Stoke On Trent | 2016 |
| A Leigh Construction Ltd | Durham | 2025 |
| A Leonard Limited | Baldock | 2000 |
| A Lester Ltd | Iver | 2021 |
| A Lester Property Limited | Glastonbury | 2018 |
| A Level Access Ltd | Hoddesdon | 2022 |
| A Level Flowing Screed Limited | Manchester | 2026 |
| A Level Property Ltd | Harrow | 2024 |
| A Level Services Limited | Mitcham | 2019 |
| A Level UP Bespoke Brickwork Ltd | East Grinstead | 2023 |
| A Level-Up Limited | St. Albans | 2022 |
| A Lewis Construction Limited | Shrewsbury | 2022 |
| A Lewis Electrical Limited | Cardiff | 2017 |
| A Licence to Chill Ltd | Bury St. Edmunds | 2014 |
| A Lidwell Construction Ltd | Coalville | 2014 |
| A Lifting Solutions Limited | Sutton | 2016 |
| A Lincoln Carpentry Limited | Romford | 2007 |
| A Lindsey & SON Limited | New Romney | 2018 |
| A Line Plumbing and Heating Limited | Preston | 2003 |
| A Lings Group Limited | Wallington | 2014 |
| A List (Perth) Limited | Perth | 2012 |