| Thermadry Limited | Chelmsford | 2023 |
| Thermal Recycling (UK) Limited | Halesowen | 2012 |
| Thermatic Drainage Limited | Salford | 2009 |
| Thermeco Swip 11 Limited | London | 2023 |
| Thermeco Swip 12 Limited | London | 2023 |
| Thermeco Waste & Recycling Limited | Manchester | 2023 |
| Thermoshield Window Services Limited | Essex | 1996 |
| Thewasteco Ltd | London | 2025 |
| Thewastemarket Ltd | London | 2022 |
| Theyellowbin Ltd | Leeds | 2021 |
| Theypoopwescoop Ltd | Hayes | 2025 |
| THF Drainage Ltd | Maidstone | 2024 |
| Thiara Transport Limited | Stoke-On-Trent | 2016 |
| Think 3E Consortium Ltd | Wellingborough | 2009 |
| Think Environmental Limited | Lichfield | 2007 |
| Think Green Skip Hire Limited | Newcastle | 2011 |
| Think H20 CIC | Wembley | 2025 |
| Think Hygiene Limited | Liskeard | 2009 |
| Think Recycle Limited | Bakewell | 2020 |
| Think Upcycle C.I.C. | Chepstow | 2025 |
| Think Waste Ltd | London | 2015 |
| Think Waste Recycling Limited | Wallingford | 2016 |
| THINK10 Ltd | Walsall | 2022 |
| Thintanks UK Limited | Whitchurch | 2023 |
| Thirteen Environmental Services Ltd | Yarm | 2018 |
| Thistle Waste Fife Ltd | Kirkcaldy | 2023 |
| Thistle Water Hygiene Limited | Greenock | 2023 |
| Thomas & SON Grab Hire Limited | Nottingham | 2018 |
| Thomas Family SW Ltd | Blackwood | 2025 |
| Thomas Flows Limited | Eastbourne | 2024 |
| Thomas Melrose Ltd | Dalkeith | 2018 |
| Thomas Moore Associates Ltd | Wakefield | 2025 |
| Thomas Muir (Rosyth) Ltd | Rosyth | 2010 |
| Thomas Muir (Waste Management) Limited | Kirkcaldy | 1983 |
| Thomas Skip and Plant Hire Ltd | Caernarfon | 2012 |
| Thompson Industrial Services Limited | Dromore | 2010 |
| Thompson Recycling & Landfill Limited | Dumbarton | 2014 |
| Thompson Technik (Newcastle) Limited | Leeds | 1993 |
| Thompson Waste Limited | Sunderland | 2013 |
| Thompson Waste Removal Ltd | Rye | 2021 |
| Thompsons Asbestos Services Ltd | York | 2021 |
| Thompsons Recycling Ltd | Altrincham | 2014 |
| Thompsons Recycling Services Limited | Cheadle | 2022 |
| Thompsons Waste Handling Equipment Limited | Croydon | 2021 |
| Thomson Environmental Services Limited | Guildford | 1993 |
| Thorhild Ltd | Doncaster | 2020 |
| Thornbury Ltd | London | 2019 |
| Thornbury Water Ltd | Prescot | 2021 |
| Thorne Metal Recyclers Limited | Oldbury | 2007 |
| Thornleigh Group Limited | Belfast | 2020 |
| Thornton Drainage Services Limited | Middlesbrough | 2018 |
| Thornton Services (Yorkshire) Limited | Scarborough | 2025 |
| Three Counties Reclamation Limited | Altrincham | 1999 |
| Three Counties Skip Hire Ltd | Upton-Upon-Severn | 2014 |
| Three Counties Toilet Hire Limited | Ledbury | 2026 |
| Three PIN Recycling Ltd | Fareham | 2013 |
| Three Sharks Ltd | Aldershot | 2026 |
| Threewastemen Ltd | London | 2025 |
| Threshfield Private Water Supply Limited | Skipton | 2006 |
| Thrift Trading Limited | Corby | 2014 |
| Throw & TOW Eco Skips Ltd | Exeter | 2019 |
| Ticarl Ltd | Omagh | 2020 |
| Tick the Box Ltd | Edgware | 2025 |
| Tick-It 8 Limited | East Sussex | 1987 |
| Tidal Links Waste Management Ltd | Kilmarnock | 2025 |
| Tidy Touch Companion Limited | Poole | 2024 |
| Tidy Waste Clearance & Removals Ltd | London | 2026 |
| Tidyhaul Ltd | Wembley | 2024 |
| Tidyli Ltd | Nottingham | 2025 |
| Tidysite Skip Services Limited | Newcastle Under Lyme | 2003 |
| Tidytown Services Ltd | London | 2025 |
| Tidyup Media Ltd | London | 2023 |
| Tiger Skip Hire Ltd | Mirfield | 2017 |
| Tiger Utilities Limited | Wallasey | 2017 |
| TIGER87 Ltd | Waltham Cross | 2023 |
| Tigerbay Removals Ltd | Cardiff | 2025 |
| Tikeros FM Ltd | London | 2023 |
| Tilbury Trading Limited | Tilbury | 2019 |
| Tile and Plumbing Services (T.A.P.S) Limited | Leicester | 2016 |
| Tillers and Sons Ltd | Walton-On-Thames | 2024 |
| Tilney Metals Ltd | London | 2025 |
| TIM Harrison Tree Services Limited | Beccles | 2013 |
| TIM Welsh Enterprises Limited | Preston | 2015 |
| Timber and Hardcore Construction Ltd | London | 2026 |
| Timber Systems Limited | Leeds | 1979 |
| Timber to Energy Ltd | Welwyn Garden City | 2025 |
| Timberpak Limited | Hexham | 2000 |
| Timberpak Pearce Limited | St Albans | 1973 |
| Time Recycling Limited | Doncaster | 2022 |
| Timeplan Couriers Ltd | London | 2019 |
| Timewise Drains Ltd | Biggleswade | 2018 |
| Timios Waste Services Ltd | Huntingdon | 2020 |
| Timmins Waste Services Limited | West Midlands | 2006 |
| TIN2BLING Ltd | Sandown | 2022 |
| Tinge Group Ltd | Wembley | 2019 |
| Tingey & Company Limited | Croydon | 2006 |
| Tintagel Skip Hire Limited | Tintagel | 2019 |
| Tinten on Farm Composting Limited | Cornwall | 2006 |
| Tiny Demolition Company Ltd | Carlisle | 2022 |
| Tiny SIA Ltd | Northampton | 2018 |