| A.P Building Solutions Ltd | Builders | DL1 1JG | 2026 |
| Absass Ltd | Builders | DL1 2RR | 2018 |
| Acnz 2022 Ltd | Builders | DL1 2NG | 2022 |
| Ah Property Improvements Ltd | Builders | DL1 1GB | 2022 |
| Ah Windtech Ltd | Builders | DL2 2ZF | 2026 |
| All Aspect Safety Ltd | Builders | DL1 4LZ | 2025 |
| Amber Grange (Darlington) Ltd | Builders | DL1 5RL | 2013 |
| Andy Hadden Landscaping & Building Services Ltd | Builders | DL1 1GB | 2024 |
| Arpent Ltd | Builders | DL1 4QB | 2024 |
| Atd Renovations Ltd | Builders | DL1 1XF | 2022 |
| Avant Developments Ne Ltd | Builders | DL1 1BJ | 2024 |
| Aw Tiling Ltd | Builders | DL1 3RG | 2019 |
| Bat Home Improvement Ltd | Builders | DL1 4WH | 2026 |
| Bat Home Improvement Services Ltd | Builders | DL1 4WH | 2026 |
| Bba North East Ltd | Builders | DL2 2PT | 2024 |
| Bd Supplies (Darlington) Ltd | Builders | DL1 5TG | 2019 |
| Bh Blinds & Shutters Ltd | Builders | DL2 1QR | 2024 |
| Blackburn Marshall Construction (Ne) Ltd | Builders | DL1 1RQ | 2011 |
| Blackwell Investments (Ne) Ltd. | Builders | DL1 1GL | 2013 |
| Braddan Structures Ltd | Builders | DL1 2PB | 2008 |
| C Hamilton Construction Ltd | Builders | DL1 3SP | 2022 |
| C&C Construction Consultants Ltd | Builders | DL2 1FE | 2024 |
| Cab Construction North East Ltd | Builders | DL1 1LA | 2024 |
| Castle Homes Maintenance Ltd | Builders | DL1 1YG | 2024 |
| Catterick Property Services Ltd | Builders | DL1 1GB | 2025 |
| Cb Access Ltd | Builders | DL1 3AY | 2023 |
| Cherry Tree Home Improvements Ltd | Builders | DL2 1QZ | 2025 |
| Cherry Westfield Ltd | Builders | DL1 4JW | 2021 |
| Chris Banks Windows Ltd | Builders | DL1 4NZ | 2003 |
| Cjf Construction Ne Ltd | Builders | DL1 1JL | 2016 |
| Cl Access Ltd | Builders | DL1 4NT | 2024 |
| Cm Door Services Ltd | Builders | DL2 2WS | 2025 |
| Cna Rigging and Lifting Solutions Ltd | Builders | DL2 1AX | 2026 |
| Cobon Validation Ltd | Builders | DL1 3TB | 2025 |
| Complete Home Inspections Guaranteed Ltd | Builders | DL2 2FD | 2024 |
| County Groundworks Ltd | Builders | DL1 4JD | 2019 |
| Csm Bolting Ltd | Builders | DL2 1GJ | 2025 |
| D B Site Services Ltd | Builders | DL2 2JS | 1998 |
| Dagg'S Home Improvements Ltd | Builders | DL1 1GB | 2025 |
| Darlington & Tees Blinds Ltd | Builders | DL2 2WB | 2026 |
| Darlington Door Services Ltd | Builders | DL1 2RR | 1999 |
| David Thornton Landscaping & Property Maintenance Ltd | Builders | DL1 2YY | 2024 |
| Design4 Ltd | Builders | DL2 2UF | 2019 |
| Dgb Building Services Ltd | Builders | DL1 3HR | 2016 |
| Dhm Roofing and Building Specialists Ltd | Builders | DL1 5NQ | 2023 |
| Dkg Project Management Ltd | Builders | DL2 2FU | 2026 |
| Doggy Access Ltd | Builders | DL2 1LW | 2017 |
| Drive-Mac Ltd | Builders | DL1 4HZ | 2024 |
| Dsj Property Maintenance Ltd | Builders | DL1 1GB | 2024 |
| Eco Rend North East Ltd | Builders | DL1 2NS | 2012 |
| Electronic Security Solutions Ltd | Builders | DL1 4QD | 2000 |
| Elite Fencing & Property Maintenance Ltd | Builders | DL1 1DY | 2026 |
| Elm Integrated Services Ltd | Builders | DL2 2QY | 2016 |
| Evry Building Solutions Ltd | Builders | DL1 1GB | 2025 |
| F & E Trade Services Ltd | Builders | DL2 2ZL | 2025 |
| Fabfans+ Ltd | Builders | DL1 3RJ | 2025 |
| Fdg Services Ltd | Builders | DL1 5TB | 2025 |
| Floorestore Commercial Ltd | Builders | DL1 3HF | 2020 |
| George Davo Ltd | Builders | DL1 1DF | 2026 |
| Graham Everett Rope Access Ltd | Builders | DL2 1HJ | 2014 |
| Grayline Tiling Ltd | Builders | DL1 2LD | 2023 |
| Gsm Maintenance Solutions Ltd | Builders | DL2 3DE | 2017 |
| Gti Installation Ltd | Builders | DL2 2AT | 2023 |
| H Caldwell Builders Ltd | Builders | DL1 4JY | 2017 |
| H Harrop Contractors Ltd | Builders | DL1 2YF | 2010 |
| H J W Builders Ltd | Builders | DL1 4HH | 2016 |
| Hanafin Estates Ltd | Builders | DL1 1GB | 2017 |
| Harper Building and Maintenance Ltd | Builders | DL1 4LE | 2024 |
| Harpers Construction & Groundworks Ltd | Builders | DL2 1JH | 2015 |
| Hauxwell Construction Services Ltd | Builders | DL1 4BJ | 2019 |
| Hightech Industrial Rescue Division Ltd | Builders | DL1 4QD | 2026 |
| Hightech Industrial Services Ltd | Builders | DL1 4QD | 2026 |
| Hinds Building Services Ltd | Builders | DL1 1GL | 2018 |
| Home & Design Property Services Ltd | Builders | DL1 3AA | 2020 |
| I.E Finishings Ltd | Builders | DL1 1GB | 2019 |
| Iexpand Developments Ltd | Builders | DL1 1GB | 2016 |
| Ikhs Property Solutions Ltd | Builders | DL1 3ED | 2024 |
| In Charge Construction Ltd | Builders | DL1 4FA | 2019 |
| Industrial Coatings North East Ltd | Builders | DL2 1UL | 2015 |
| Isg Facility Management Ltd | Builders | DL1 2PJ | 2025 |
| J M & A Ramsay (Contracting & Plant Hire) Ltd | Builders | DL1 1GL | 2005 |
| J S Welch Ltd | Builders | DL1 1XL | 2022 |
| J Welch Ltd | Builders | DL1 4JD | 2021 |
| J. Arkle Ltd | Builders | DL2 1UA | 2019 |
| J.P. Hunt Building Contractors Ltd | Builders | DL1 3DF | 2004 |
| Ja Working At Height Ltd | Builders | DL1 3EA | 2023 |
| Jhc Grounworks Ltd | Builders | DL1 1GB | 2021 |
| Jig UK Drainage Solutions Ltd | Builders | DL2 1RJ | 2021 |
| Jonny Smith Surveying Services Ltd | Builders | DL1 4JF | 2015 |
| Jordan Wingfield Construction Ltd | Builders | DL1 1LA | 2023 |
| Key 4 Services Ltd | Builders | DL1 1GL | 2024 |
| Key Interiors Ltd | Builders | DL1 2EP | 2015 |
| Kinship Developments Ltd | Builders | DL1 1DF | 2025 |
| L Graney Plumbing & Heating Ltd | Builders | DL2 2DW | 2021 |
| L&C Construction Ltd | Builders | DL1 1GB | 2021 |
| L&M Race Paving Ltd | Builders | DL2 3LA | 2017 |
| Lc13 Groundworks Ltd | Builders | DL1 4NR | 2022 |
| Lineside Fencing Ne Ltd | Builders | DL1 3LZ | 2021 |
| M James Technical Services Ltd | Builders | DL1 2DU | 2023 |
| Map Building & Roofing Ltd | Builders | DL1 1GY | 2018 |
| Marple'S Property Ltd | Builders | DL1 1XH | 2025 |
| Merrybent Project Management Ltd. | Builders | DL2 2LF | 2004 |
| Metro Ceramics Ltd | Builders | DL1 4JW | 2006 |
| Middle East Holding Ltd | Builders | DL1 4DE | 1893 |
| Ml Driveways-Patios & Groundworks Ltd | Builders | DL1 1GB | 2023 |
| Mmb Properties Ltd | Builders | DL1 3TF | 2001 |
| Mw Rail Ltd | Builders | DL2 1FJ | 2026 |
| Mwb Services Ltd | Builders | DL2 2JH | 2022 |
| Neasham Solutions Ltd | Builders | DL1 2PU | 2025 |
| Nesbitt Security Systems Ltd | Builders | DL1 2FA | 2023 |
| Newalldevelopmentgroup Ltd | Builders | DL1 1GB | 2024 |
| Next Level Construction Services Ltd | Builders | DL1 1GB | 2024 |
| Nicoll Sub Contractors Ltd | Builders | DL1 4RZ | 2025 |
| North East Property Projects Ltd | Builders | DL1 5EA | 2009 |
| Nu-Interiors Ltd | Builders | DL1 2GB | 2013 |
| Oakdale Building and Construction Ltd | Builders | DL1 4DG | 2026 |
| Oceanex Ltd | Builders | DL1 1GL | 2011 |
| Offshore Access Solutions Ltd | Builders | DL1 3HQ | 2026 |
| Partek Site Services Ltd | Builders | DL2 2LF | 2014 |
| Paul Wilson Construction Ltd | Builders | DL1 5EF | 2023 |
| Perspective Blinds Ltd | Builders | DL2 3US | 2026 |
| Phoenix Improvements Ltd | Builders | DL1 2AX | 2018 |
| Php Installations Ltd | Builders | DL1 1GB | 2010 |
| Plasterboard Recycling Group Ltd | Builders | DL2 3RR | 2019 |
| Prime Property By Daniel Jeffs Ltd | Builders | DL2 1GP | 2025 |
| Proassemble Ltd | Builders | DL2 2BX | 2025 |
| Provault Construction Services Ltd | Builders | DL1 4YT | 2026 |
| Q9 Cladding Solutions Ltd | Builders | DL2 3PX | 2011 |
| Ql Development Ltd | Builders | DL1 5NA | 2021 |
| R W Fencing Ltd | Builders | DL2 2XT | 2008 |
| Real Access Ltd | Builders | DL1 3EY | 2026 |
| Regal Structures Ltd | Builders | DL1 2AL | 2017 |
| Regent Maintenance Ltd | Builders | DL1 4QB | 2000 |
| Rnb Building & Roofing Ltd | Builders | DL1 1GB | 2024 |
| Rob Dent Ltd | Builders | DL1 4RX | 2022 |
| Robson Granite Worksurfaces Ltd | Builders | DL2 2TT | 2017 |
| Rockwell Render Ltd | Builders | DL1 1LA | 2023 |
| Rt Drives and Patios (Ne) Ltd | Builders | DL1 4DG | 2023 |
| Rtl Energy Consultants Ltd | Builders | DL2 1QR | 2025 |
| S & S Rope Access Systems Ltd | Builders | DL1 2DY | 2024 |
| S W Improvements Ltd | Builders | DL1 4ER | 2023 |
| Sand & Deliver Ltd | Builders | DL1 1JL | 2025 |
| Sb Brookdale Services Ltd | Builders | DL1 1BA | 2023 |
| Scott Duggan Timber Framing Ltd | Builders | DL1 1GB | 2026 |
| Sea & Land Welding Ltd | Builders | DL1 3RE | 2013 |
| Stephen Oliver Living Ltd | Builders | DL2 1RA | 2025 |
| Stepramp Ltd | Builders | DL1 2PT | 2013 |
| Steven Bowes Construction Ltd | Builders | DL2 2PS | 2019 |
| Stone Technical Services Group Ltd | Builders | DL1 4YA | 2000 |
| Sts General Maintenance Fm Ltd | Builders | DL1 4YA | 2013 |