| 1st Degree Heating and Plumbing Services Ltd | Plumbing & heating | DL11 6BU | 2007 |
| 3 Wire Heating Ltd | Plumbing & heating | DL2 2AR | 2020 |
| 3 Wire Ltd | Electricians | DL2 2AR | 2007 |
| Acute Pest Solutions Ltd | Pest control | DL2 1DW | 2015 |
| Ah Windtech Ltd | Builders | DL2 2ZF | 2026 |
| Bau Innenraum Ltd | Plumbing & heating | DL2 1RE | 2017 |
| Bba North East Ltd | Builders | DL2 2PT | 2024 |
| Bespoke Skin and Aesthetics Ltd | Hair & beauty | DL2 2RY | 2026 |
| Bh Blinds & Shutters Ltd | Builders | DL2 1QR | 2024 |
| Bluespike Landscape Designs Ltd | Gardeners & landscapers | DL11 6LE | 2007 |
| Brookes Hv Solutions Ltd | Electricians | DL2 2BQ | 2026 |
| Browson Design & Build Ltd | Joiners & carpenters | DL11 7HE | 2017 |
| C G Egan Ltd | Hair & beauty | DL2 2XD | 2024 |
| C&C Construction Consultants Ltd | Builders | DL2 1FE | 2024 |
| C:Tose Ltd | Painters & decorators | DL2 2PT | 2025 |
| Calton Group Ltd | Builders | DL11 7QT | 2018 |
| Calvert & Co Construction Ltd | Builders | DL11 6NE | 2026 |
| Calvert & Jenkinson Ltd | Builders | DL11 6NE | 2008 |
| Cherry Tree Home Improvements Ltd | Builders | DL2 1QZ | 2025 |
| Cherry Tree Landscaping Ltd | Gardeners & landscapers | DL2 1QZ | 2022 |
| Chloe Roddam Ltd | Hair & beauty | DL2 3EB | 2021 |
| Cm Door Services Ltd | Builders | DL2 2WS | 2025 |
| Cmh Decorators Ltd | Painters & decorators | DL2 2BF | 2025 |
| Cna Rigging and Lifting Solutions Ltd | Builders | DL2 1AX | 2026 |
| Complete Home Inspections Guaranteed Ltd | Builders | DL2 2FD | 2024 |
| Complete Roofs and Drives Ltd | Roofers | DL2 1RP | 2023 |
| Csm Bolting Ltd | Builders | DL2 1GJ | 2025 |
| Ctc Marine Projects Ltd | Builders | DL11 6EL | 2021 |
| Custom Lvt Flooring Ltd | Flooring & tiling | DL11 6SP | 2023 |
| D B Site Services Ltd | Builders | DL2 2JS | 1998 |
| Dales Garden Services Ltd | Gardeners & landscapers | DL11 7DU | 2002 |
| Darlington & Tees Blinds Ltd | Builders | DL2 2WB | 2026 |
| Demi Nicole Aesthetics Ltd | Hair & beauty | DL2 1TY | 2025 |
| Design4 Ltd | Builders | DL2 2UF | 2019 |
| Diamond 4x4 Repairs Ltd | Garages & mechanics | DL2 3LQ | 2010 |
| Dkg Project Management Ltd | Builders | DL2 2FU | 2026 |
| Doggy Access Ltd | Builders | DL2 1LW | 2017 |
| Dovetail Joinery & Building Services Ltd | Joiners & carpenters | DL2 3NH | 2020 |
| Durham Tees Valley Windows, Doors and Conservatories Ltd | Glaziers | DL2 1RA | 2007 |
| Eastholme Commercials Ltd | Garages & mechanics | DL11 7RD | 2019 |
| Ellis Builders Ltd | Builders | DL11 7HX | 2002 |
| Elm Integrated Services Ltd | Builders | DL2 2QY | 2016 |
| Endeavour Electrical Engineering Ltd | Electricians | DL2 2SN | 2026 |
| Eurojag Services Ltd | Garages & mechanics | DL2 1QH | 2020 |
| Eve Beauty Ltd | Hair & beauty | DL2 2FU | 2011 |
| Excellere Plumbing & Heating Ltd | Plumbing & heating | DL2 1AD | 2025 |
| F & E Trade Services Ltd | Builders | DL2 2ZL | 2025 |
| Fitting Property Solutions Ltd | Joiners & carpenters | DL2 1LE | 2020 |
| G.E.Brown & Son Ltd | Builders | DL11 6NH | 2006 |
| Gasgo Plumbing & Heating Ltd | Plumbing & heating | DL2 2AW | 2010 |
| Gavin Watson Plumbing & Heating Ltd | Plumbing & heating | DL2 1HF | 2017 |
| Goldielocks Training Academy Ltd | Hair & beauty | DL2 2GG | 2024 |
| Good Vibes Estates & Facilities Ltd Ltd | Electricians | DL2 2BU | 2026 |
| Graham Everett Rope Access Ltd | Builders | DL2 1HJ | 2014 |
| Granite Rentals Ltd | Joiners & carpenters | DL2 2ZE | 2022 |
| Grove House Pest Control Ltd | Pest control | DL11 7QR | 2012 |
| Gsm Maintenance Solutions Ltd | Builders | DL2 3DE | 2017 |
| Gti Installation Ltd | Builders | DL2 2AT | 2023 |
| H. J. I'Anson Ltd | Groundworks & demolition | DL2 2UH | 2009 |
| Halo Corporate Holdings Ltd | Hair & beauty | DL2 2NY | 2023 |
| Halo Hair Group Darlington Ltd | Hair & beauty | DL2 2NY | 2007 |
| Halo Hair Group Durham Ltd | Hair & beauty | DL2 2NY | 2024 |
| Halo Hair Group Glasgow Ltd | Hair & beauty | DL2 2NY | 2024 |
| Halo Hair Group Reading Ltd | Hair & beauty | DL2 2NY | 2024 |
| Hammond Swimming Pools Ltd | Builders | DL11 7PW | 1998 |
| Harpers Construction & Groundworks Ltd | Builders | DL2 1JH | 2015 |
| Hd-Hv Ltd | Electricians | DL2 2BQ | 2026 |
| Heron Drive Ltd | Builders | DL11 7BL | 2016 |
| Hl Medical Aesthetics Ltd | Hair & beauty | DL2 1LG | 2022 |
| Ian Walker & Sons Ltd | Builders | DL11 7RA | 2002 |
| Industrial Coatings North East Ltd | Builders | DL2 1UL | 2015 |
| Innishannon Developments Ltd | Builders | DL11 6UL | 2016 |
| Into Painting & Decorating Ltd | Painters & decorators | DL2 2ND | 2021 |
| J. Arkle Ltd | Builders | DL2 1UA | 2019 |
| J. R. Wilkinson & Sons Ltd | Builders | DL11 7ED | 2002 |
| J.L. Greenwood Ltd | Joiners & carpenters | DL11 6AF | 2019 |
| Jasmine Construction Ltd | Builders | DL11 7HS | 2025 |
| Jig UK Drainage Solutions Ltd | Builders | DL2 1RJ | 2021 |
| Jkd Plumbing Ltd | Plumbing & heating | DL11 6BU | 2025 |
| Jl Plasterers Ne Ltd | Plasterers | DL2 2RZ | 2021 |
| Js Calvert Ltd | Builders | DL11 6TW | 2003 |
| L Graney Plumbing & Heating Ltd | Builders | DL2 2DW | 2021 |
| L&M Race Paving Ltd | Builders | DL2 3LA | 2017 |
| Lambert Trades Ltd | Plumbing & heating | DL2 2DA | 2025 |
| Lawson Tyre & Autocare Ltd | Garages & mechanics | DL2 2DF | 2025 |
| Lv Cable Solutions Ltd | Electricians | DL2 2XR | 2022 |
| M.A.G. Building Services Ltd | Builders | DL11 7TX | 2002 |
| Maudes Plumbing & Heating Ltd | Plumbing & heating | DL11 7RA | 2026 |
| Merrybent Project Management Ltd. | Builders | DL2 2LF | 2004 |
| Mgb Signalling Ltd | Electricians | DL2 1QY | 2003 |
| Mgh Property Maintenance Ltd | Electricians | DL2 1RD | 2023 |
| Mhh Salons Ltd | Hair & beauty | DL2 1TN | 2026 |
| Michael Guy Electrical Ltd | Electricians | DL11 6PJ | 2013 |
| Mobile Dpf Cleaning Ltd | Garages & mechanics | DL2 1LF | 2016 |
| Msl Projects Ltd | Electricians | DL2 1QY | 1993 |
| Mw Rail Ltd | Builders | DL2 1FJ | 2026 |
| Mwb Services Ltd | Builders | DL2 2JH | 2022 |
| On Tap Heating Services Ltd | Plumbing & heating | DL2 1FX | 2009 |
| Optimaland Ltd | Builders | DL11 6RE | 2005 |
| Partek Site Services Ltd | Builders | DL2 2LF | 2014 |
| Paulmichael Hairdressing Ltd | Hair & beauty | DL2 1PW | 2012 |
| Peluquero Ltd | Hair & beauty | DL2 1EF | 2018 |
| Pepedean Ltd | Hair & beauty | DL2 2EA | 2014 |
| Perspective Blinds Ltd | Builders | DL2 3US | 2026 |
| Plasterboard Recycling Group Ltd | Builders | DL2 3RR | 2019 |
| Poppy’S Tubing Ltd | Plumbing & heating | DL2 1HF | 2025 |
| Powercare Electrical Services Ltd | Electricians | DL2 1NA | 2010 |
| Ppw Services Ltd | Cleaners | DL2 2LY | 2024 |
| Prime Property By Daniel Jeffs Ltd | Builders | DL2 1GP | 2025 |
| Proassemble Ltd | Builders | DL2 2BX | 2025 |
| Q9 Cladding Solutions Ltd | Builders | DL2 3PX | 2011 |
| R W Fencing Ltd | Builders | DL2 2XT | 2008 |
| R.W. Charlton Builders Ltd | Builders | DL11 6BQ | 2007 |
| Resin Bound Solutions Ltd | Gardeners & landscapers | DL2 2FD | 2025 |
| Reuben Owen Ltd | Builders | DL11 6LP | 2022 |
| Robson Banks Ltd | Hair & beauty | DL2 3PX | 2008 |
| Robson Granite Worksurfaces Ltd | Builders | DL2 2TT | 2017 |
| Rokeby Forge Ltd | Builders | DL11 7AA | 2003 |
| Rsrk Ltd. | Garages & mechanics | DL2 1HS | 2025 |
| Rtl Energy Consultants Ltd | Builders | DL2 1QR | 2025 |
| S.M.B. 4x4 Ltd | Garages & mechanics | DL2 3PQ | 2005 |
| Sam Clennell Motorsport Ltd | Garages & mechanics | DL2 2RD | 2022 |
| Securenet Electrical Ltd | Electricians | DL2 1TN | 2024 |
| Select Electrical Ne Ltd | Electricians | DL2 2LE | 2021 |
| Sharp Cleaning Services Ne Ltd | Cleaners | DL2 2XF | 2023 |
| Shelden Plastering Ltd | Plasterers | DL2 2EA | 2017 |
| Sl Bathrooms Ltd | Plumbing & heating | DL2 2QZ | 2008 |
| Sparta Commercial Cleaning Ltd | Cleaners | DL2 2BN | 2017 |
| Stephen Lockey Plumbing and Heating Ltd | Plumbing & heating | DL2 1RD | 2017 |
| Stephen Oliver Living Ltd | Builders | DL2 1RA | 2025 |
| Steve Jones Bathrooms Ltd | Plumbing & heating | DL11 7BW | 2026 |
| Steven Bowes Construction Ltd | Builders | DL2 2PS | 2019 |
| Steven Morgan Logistics Ltd | Electricians | DL11 6RX | 2024 |
| Stubbs Electrical Ltd | Electricians | DL11 6RE | 2001 |
| Sylvan Glade Spv Ltd | Builders | DL2 1PD | 2024 |
| T & M Weaver Ltd | Plasterers | DL2 3RL | 2005 |
| Tees Valley Campers & Customs Ltd | Garages & mechanics | DL2 2WU | 2023 |
| Teward Bros Ltd | Groundworks & demolition | DL2 3JT | 2000 |
| The Barn Skin Ltd | Hair & beauty | DL2 1LN | 2023 |
| The Buddhas Hand Ltd | Cleaners | DL11 7EG | 2020 |
| The Classic Car Workshop Ltd | Garages & mechanics | DL2 2PP | 2009 |
| The Strays Building Services Ltd | Builders | DL2 2GE | 2024 |
| Thistle Solutions Ltd | Builders | DL2 1AS | 2013 |
| Tile & Timber Ltd | Cleaners | DL2 2AL | 2026 |
| Tony Sunter Build Ltd | Builders | DL11 6HJ | 2003 |
| Townson Plumbing and Heating Ltd | Plumbing & heating | DL11 7JG | 2020 |
| Tredray Electrical Contracting Ltd | Electricians | DL11 6LR | 2016 |
| Trunghao Estate Agent Ltd | Builders | DL2 2RY | 2023 |
| Ultraspray Ltd | Garages & mechanics | DL2 1UE | 2001 |
| Unique Roofs Ltd | Roofers | DL2 1AL | 2016 |