| Ktcivils Ltd | Derby | 2014 |
| Kubo Services Ltd | London | 2026 |
| Kunkic Company Limited | Milton Keynes | 2025 |
| Kurt & Son's Waste OIL Recycled Ltd | Cockfosters | 2023 |
| KVN Prime Solutions Limited | Burnley | 2025 |
| KVP Renewable Energy Limited | Wembley | 2025 |
| KVS Recycling Ltd | Coventry | 2026 |
| KVS Vehicles Limited | Keighley | 2024 |
| Kvss Ltd | Wigan | 2023 |
| KW 1000 Limited | Gloucester | 2018 |
| KW 1002 Limited | Gloucester | 2018 |
| KW Drains Limited | Heysham | 2019 |
| KW Lilleybrook Limited | Gloucester | 2018 |
| Kwik Body Works Ltd | Ilford | 2007 |
| Kwik Clean Ltd | Bath | 2019 |
| Kwik Haulage & Skips Limited | Southall | 2015 |
| Kwik JET Limited | Cranleigh | 1993 |
| Kwik Sweep Limited | London | 2010 |
| Kwik Waste Ltd | Bath | 2022 |
| Kwikclear Drains Limited | Chertsey | 2020 |
| Kwiktip Limited | Derby | 2022 |
| KWM Recycling Ltd | Llanelli | 2023 |
| Kwt.Plumbing & Heating Ltd | Basildon | 2023 |
| Kyeleon Ltd | Derby | 2015 |
| L & I Drainage Solutions Ltd | Enfield | 2010 |
| L & J Drainage Limited | Stevenage | 2011 |
| L & J Lonsdale Metal Merchants (Walsall) Limited | | 1973 |
| L & L Commodities Limited | Haltwhistle | 2012 |
| L & R Transport Ltd | London | 2019 |
| L & T Metals Limited | Rotherham | 2015 |
| L and M Mains and Moling Limited | Bognor Regis | 2024 |
| L and O Waste Services Ltd | Whitehaven | 2024 |
| L Beldom Limited | Stanmore | 2012 |
| L Murphy Building Ltd | Swansea | 2026 |
| L N Waste & Recycling Ltd | Bradford | 2022 |
| L Philliskirk & SON Ltd | York | 2006 |
| L Quinton Consultancy Services Limited | Redditch | 2024 |
| L R Haulage Limited | Barnet | 2018 |
| L R Jones Scrap Metal Merchants Ltd | Lymington | 2011 |
| L Sheppard Group Ltd | Milton Keynes | 2011 |
| L Smith & SON Recycling Ltd | Burton-On-Trent | 2024 |
| L T H Recycling Limited | Driffield | 2022 |
| L T M Property Maintenance Limited | Renfrew | 2025 |
| L T S Metal Recycling Limited | Harrow | 2023 |
| L T S Recycling Services Limited | Harrow | 2023 |
| L T S Site Services Incorporated Limited | Harrow | 2014 |
| L T S Skip Hire Limited | Harrow | 2023 |
| L W Recycling Ltd | Rugeley | 2009 |
| L W Skips & Conquest Transport Limited | Cannock Wood Street | 1996 |
| L&A Drainage Limited | Waltham Cross | 2026 |
| L&A Sons Recycling Ltd | Isleworth | 2025 |
| L&D Property Maintenance Limited | Denny | 2025 |
| L&D Waste Services Limited | Doncaster | 2025 |
| L&J Grab & Tipper Hire Ltd | Leeds | 2022 |
| L&J Propety Maintenance and Wasteman Removal Services Limited | Bridgend | 2017 |
| L&J Skip & Plant Hire Ltd | Barnsley | 2018 |
| L&R Recycling Limited | Canterbury | 2023 |
| L&S Operators Ltd | Perth | 2025 |
| L&S Recycling Ltd | Manchester | 2019 |
| L&S Waste Management Limited | High Wycombe | 1997 |
| L. & D. Mortimer Limited | Bury | 1989 |
| L. J. Anderson Facilities Limited | Newark | 2016 |
| L.A Drainage Solutions Ltd | London | 2024 |
| L.A.G Constructions Ltd | Manchester | 2016 |
| L.A.S. Recycling Limited | Ceredigion | 1992 |
| L.B. Demolition and Haulage Company Limited | Surrey | 1973 |
| L.J Environmental Waste Management Limited | Bridgend | 2023 |
| L.J. Grundon & Sons Limited | Ashford | 1956 |
| L.K.Skips Limited | Swindon | 2014 |
| L.M Grabhire Limited | Cranbrook | 2019 |
| L2B Trade Limited | Horsham | 2024 |
| L2L Waste Management Ltd | Ripley | 2022 |
| LAB Supreme PLC | London | 2022 |
| Labcycle Ltd | Croydon | 2021 |
| Labrynth Property Services Ltd | Maidstone | 2013 |
| Labwaste Ltd | Marlow | 2005 |
| LAC 2021 Limited | Woking | 2021 |
| Laci Land Restoration Ltd | Bexhill | 2016 |
| Lacre Pipelines Ltd | New Tredegar | 2016 |
| Ladbytams Ltd | Bromley | 2025 |
| Ladies With a Van Ltd | Sudbury | 2025 |
| Ladizone Hygiene Limited | Brighton | 2005 |
| LAE Enviromental Ltd | Chorley | 2025 |
| Lagan Meica Limited | Belfast | 1996 |
| Lahurey Ltd | Wembley | 2024 |
| Laindon Metals Ltd | Basildon | 2021 |
| Lairdshill Contracting Limited | Glasgow | 2018 |
| Lake and River Maintenance Limited | Cranleigh | 2019 |
| Lake Consulting Ltd | East Morden | 2025 |
| Lakefield Furniture Limited | Nr.Wavendon | 1990 |
| Lakeland Asbestos Management Services Limited | Windermere | 2012 |
| Lakeland Gold Limited | Kendal | 2015 |
| Lakeland Polymers Limited | Leicester | 2020 |
| Lakes & Dales Water Supplies Limited | Wigan | 2000 |
| Lakes and Rivers Environmental Services Ltd | Ulverston | 2024 |
| Lakeside Energy From Waste Limited | Wallingford | 1999 |
| Lakeside Environmental Limited | Mochdre | 2013 |
| Lakeside MRF Ltd | Coventry | 2020 |
| Lakeside Recycling Limited | St. Austell | 2014 |
| Lamare Services Ltd | Bideford | 2018 |