| Lawson Grove Management Company Limited | Plymouth | 2000 |
| Laycie Services Limited | Bedford | 2022 |
| Laystall Engineering (Solihull) Limited | 8 Cherry Street | 1938 |
| Lazy Driver Ltd | Doncaster | 2021 |
| LB Aggregates Ltd | Bedford | 2021 |
| LB Utilities Services Limited | Essex | 2023 |
| LB Waste Management Limited | Kings Lynn | 2022 |
| LBE Maintenance Service Ltd | Wakefield | 2019 |
| LBS 3 Limited | Nash Lane | 2009 |
| LC Recycling Limited | Warrington | 2017 |
| LC Remediation Contracting Ltd | Mexborough | 2018 |
| LC Services NE Limited | Stockton-On-Tees | 2025 |
| Lccwales Limited | Aberdare | 2006 |
| LCI Rail National Projects Ltd | Rugeley | 2016 |
| LCM Environmental Services Holdings Limited | Padiham | 2018 |
| LCM Environmental Services Limited | Padiham | 2013 |
| LCM79 Ltd | London | 2023 |
| Lcwm Limited | London | 2019 |
| Lcwm Services Limited | Glasgow | 2025 |
| LD Drainage Services Ltd | Bracknell | 2025 |
| LD Waste Ltd | London | 2025 |
| LDN Environmental Ltd | Staines-Upon-Thames | 2026 |
| LDN Waste Ltd | Swanley | 2020 |
| LDT Pest Control Limited | Southend On Sea | 2025 |
| LEA & DI Services Ltd | Hounslow | 2014 |
| Leachate Limited | Coventry | 2013 |
| Leachate Solutions Limited | Liverpool | 2015 |
| Leadbetter Contracting Ltd | Huntingdon | 2024 |
| Leader's Engineering and Environmental Services Limited | Eastbourne | 2008 |
| Leaders Septic Tank Emptying Cornwall Ltd | Camborne | 2020 |
| Leading Environmental Solutions Ltd | Ware | 2020 |
| Leaf Environmental Services Ltd | Newton-Le-Willows | 2017 |
| Leaf Water Limited | Braintree, | 2023 |
| Leagrave Waste Disposal Limited | Luton | 2022 |
| Leak Aware Ltd | Stockton-On-Tees | 2020 |
| Leak Detection Services NI Ltd | Dunmurry | 2020 |
| Leaside Cars Ltd | Hemel Hempstead | 2018 |
| Leather Waste UK Limited | Bacup | 2013 |
| Ledc Drainage Limited | Peterborough | 2023 |
| Ledsham Barns Management Company Limited | Ledsham | 2007 |
| LEE Ashworth Excavations Limited | Rossundals | 2003 |
| LEE Kidd Waste Ltd | Coventry | 2019 |
| LEE Marketing Consultancy Ltd | Bournemouth | 2025 |
| LEE Metal and Waste Recycling Ltd | Dartford | 2023 |
| LEE Price EFW Consultancy Ltd | Lydney | 2018 |
| LEE Reclaim Limited | Nottinghamshire | 1997 |
| LEE Remediation Limited | Warrington | 2007 |
| LEE Rich Demolition Ltd | Newcastle Upon Tyne | 2021 |
| LEE Smith's Scrap Metals Limited | Diss | 2013 |
| Lee's Maintenance Ltd | Kingston Upon Thames | 2024 |
| Lee's Waste Disposal Ltd | Bristol | 2026 |
| Lee's Waste Wizards Ltd | Leigh | 2019 |
| Leeburn Recycling Limited | Renfrewshire | 2018 |
| Leeds Junk & Rubbish Limited | Cleckheaton | 2017 |
| Leeds Skip Hire Ltd | Bradford | 2018 |
| Leeds Tipper Hire Limited | Leeds | 2022 |
| Leemans Waste Centre Ltd | London | 2014 |
| Leep Networks (Water) Limited | Manchester | 2006 |
| Leep Water Networks Limited | Manchester | 2008 |
| Leep Water Solutions Limited | Manchester | 2012 |
| Lees Industrial Services Limited | St. Helens | 2003 |
| Lees TEC Ltd | Horsham | 2023 |
| Leesafe Limited | Canvey Island | 1997 |
| Leese's Recycling Limited | Exeter | 2014 |
| Leewood Recycling Ltd | Kings Langley | 2022 |
| Leewood Skip Hire Limited | Borehamwood | 2002 |
| Legacy Water Ltd | London | 2021 |
| Legede Ltd | London | 2024 |
| Legend Waste Management Ltd | Ashford | 2020 |
| Legendata Ltd | Enfield | 2021 |
| Legionella AI Ltd | Cannock | 2025 |
| Legionella Consultancy Services Ltd | Redditch | 2009 |
| Legionella Management Services Limited | Lichfield | 2017 |
| Legionella Management Solutions Ltd | Sutton | 2023 |
| Legionella Risk Assessments Limited | Crawley, | 2018 |
| Legionella Risk Solutions Ltd | Rushden | 2016 |
| Legionella Solutions Limited | Rossendale | 2015 |
| Legionella Testing Limited | Milton Keynes | 2012 |
| Legionella Water Services Ltd | Birmingham | 2020 |
| Legionellasafe Services (UK) Limited | Lichfield | 2017 |
| Lehlah Services Ltd | Walsall | 2024 |
| Leicester House Clearance Service Limited | Leicester | 2009 |
| Leicester Recycling Limited | Leicester | 2000 |
| Leicester Waste Removal Ltd | Leicester | 2024 |
| Leicestershire Waste & Recycling Solutions Ltd | Rugby | 2026 |
| Leigh Skips Limited | Chichester | 2021 |
| Leinster Environmentals (UK) Limited | Newry | 2012 |
| Leipers Ltd | Carlisle | 2025 |
| Leisureloop Ltd | Hull | 2023 |
| Lello Holdings Limited | Hayle | 2018 |
| Lelo Aggregates Ltd | Corwen | 2021 |
| Lelo Metal Recycling Ltd | Corwen | 2010 |
| Lelo Skip Hire Limited | Corwen | 2005 |
| Lemirl Limited | Dalry | 2000 |
| Lemon Drainage Services Limited | Chichester | 2015 |
| Lemroc Group Ltd | Saffron Walden | 2023 |
| Lenflo Waste Ltd | Rochester | 2023 |
| Lenlo Limited | Basildon | 2025 |
| Lenton Treatments (Leicester) Limited | Leicester | 1978 |
| LEO & ANK Ltd | Hull | 2019 |