| 3 Alarms Ltd | Builders | DL17 8JH | 2005 |
| A.P Building Solutions Ltd | Builders | DL1 1JG | 2026 |
| Absass Ltd | Builders | DL1 2RR | 2018 |
| Acnz 2022 Ltd | Builders | DL1 2NG | 2022 |
| Ae Construction Services Ltd | Builders | DL17 0PY | 2026 |
| Ah Property Improvements Ltd | Builders | DL1 1GB | 2022 |
| Akm Wind Services Ltd | Builders | DL17 9EL | 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 |
| Appletree Building Contractors Ltd | Builders | DL17 8JH | 2016 |
| 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 |
| Bayhaven Ltd | Builders | DL17 8QE | 2000 |
| Bd Supplies (Darlington) Ltd | Builders | DL1 5TG | 2019 |
| Blackburn Marshall Construction (Ne) Ltd | Builders | DL1 1RQ | 2011 |
| Blackwell Investments (Ne) Ltd. | Builders | DL1 1GL | 2013 |
| Bowling Home Improvements Ltd | Builders | DL17 8DA | 2019 |
| Braddan Structures Ltd | Builders | DL1 2PB | 2008 |
| Bremner Brown Carpentry Ltd | Builders | DL5 6RY | 2012 |
| Brothers Excavation Groundwork Service Ltd | Builders | DL17 9AT | 2023 |
| Building and Joinery Services Ltd | Builders | DL17 8JH | 2026 |
| Buildpro Solution Service Ltd | Builders | DL17 8PW | 2024 |
| C Hamilton Construction Ltd | Builders | DL1 3SP | 2022 |
| Cab Construction North East Ltd | Builders | DL1 1LA | 2024 |
| Cadsphere Ltd | Builders | DL5 6GG | 2011 |
| Castle Homes Maintenance Ltd | Builders | DL1 1YG | 2024 |
| Catterick Property Services Ltd | Builders | DL1 1GB | 2025 |
| Cb Access Ltd | Builders | DL1 3AY | 2023 |
| Cdi High Access Ltd | Builders | DL17 9AT | 2017 |
| 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 |
| Cobon Validation Ltd | Builders | DL1 3TB | 2025 |
| Construct Group Design & Build Ltd | Builders | DL17 8JH | 2025 |
| Construct North East Ltd | Builders | DL17 8JH | 2023 |
| Cook&Pearson Joinery Services Ltd | Builders | DL17 0LE | 2015 |
| Corbridge & Northumberland Handyman Ltd | Builders | DL17 0DT | 2026 |
| County Groundworks Ltd | Builders | DL1 4JD | 2019 |
| Dagg'S Home Improvements Ltd | Builders | DL1 1GB | 2025 |
| Daniel Mallett Ltd | Builders | DL5 6GG | 2015 |
| Darlington Door Services Ltd | Builders | DL1 2RR | 1999 |
| David Thornton Landscaping & Property Maintenance Ltd | Builders | DL1 2YY | 2024 |
| Devere Building Services Ltd | Builders | DL5 6RN | 2009 |
| Dgb Building Services Ltd | Builders | DL1 3HR | 2016 |
| Dhm Roofing and Building Specialists Ltd | Builders | DL1 5NQ | 2023 |
| Diggers 2u Ltd | Builders | DL5 6GU | 2021 |
| Drive-Mac Ltd | Builders | DL1 4HZ | 2024 |
| Dsj Property Maintenance Ltd | Builders | DL1 1GB | 2024 |
| Eco Rend North East Ltd | Builders | DL1 2NS | 2012 |
| Ecodrill Utilities Ltd | Builders | DL17 0JX | 2013 |
| Electronic Security Solutions Ltd | Builders | DL1 4QD | 2000 |
| Elite Fencing & Property Maintenance Ltd | Builders | DL1 1DY | 2026 |
| Elite Sheet Ltd | Builders | DL5 7JP | 2019 |
| Evry Building Solutions Ltd | Builders | DL1 1GB | 2025 |
| Fabfans+ Ltd | Builders | DL1 3RJ | 2025 |
| Fdg Services Ltd | Builders | DL1 5TB | 2025 |
| Flic (Ne) Ltd | Builders | DL17 0EB | 2024 |
| Floorestore Commercial Ltd | Builders | DL1 3HF | 2020 |
| George Davo Ltd | Builders | DL1 1DF | 2026 |
| Go Cladding Services Ltd | Builders | DL17 8DA | 2014 |
| Grayline Tiling Ltd | Builders | DL1 2LD | 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 |
| Hanjamemi Group Ltd | Builders | DL17 8JH | 2022 |
| Harper Building and Maintenance Ltd | Builders | DL1 4LE | 2024 |
| 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 |
| Isg Facility Management Ltd | Builders | DL1 2PJ | 2025 |
| J D Jowett Ltd | Builders | DL17 8JH | 2017 |
| J Lingard Site Services Ltd | Builders | DL17 8JH | 2018 |
| 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.P. Hunt Building Contractors Ltd | Builders | DL1 3DF | 2004 |
| J.Stevens Access Ltd | Builders | DL17 0HS | 2025 |
| Ja Working At Height Ltd | Builders | DL1 3EA | 2023 |
| Jhc Grounworks Ltd | Builders | DL1 1GB | 2021 |
| Jmb Commercial Ltd | Builders | DL17 8JH | 2023 |
| 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 |
| Kitchen Design (North East) Ltd | Builders | DL17 9AT | 2008 |
| L Brown Installations Ltd | Builders | DL17 8JH | 2018 |
| L&C Construction Ltd | Builders | DL1 1GB | 2021 |
| Lc13 Groundworks Ltd | Builders | DL1 4NR | 2022 |
| Leary'S Property Development Ltd | Builders | DL17 0HA | 2019 |
| Lineside Fencing Ne Ltd | Builders | DL1 3LZ | 2021 |
| Ljs Plotworks Ltd | Builders | DL17 9EN | 2025 |
| Lrt Groundworks Ltd | Builders | DL17 9AA | 2023 |
| M D Property Solutions Ltd | Builders | DL17 8UA | 2018 |
| M Hodgson Builders Ltd | Builders | DL5 6PN | 2003 |
| M James Technical Services Ltd | Builders | DL1 2DU | 2023 |
| Madi Construction Management Ltd | Builders | DL17 0FA | 2024 |
| Map Building & Roofing Ltd | Builders | DL1 1GY | 2018 |
| Marc Jemmeson Access & Construction Ltd | Builders | DL17 9AT | 2014 |
| Mark Lockey Site Services Ltd | Builders | DL5 6PN | 2013 |
| Marple'S Property Ltd | Builders | DL1 1XH | 2025 |
| Mdj Utilities Ltd | Builders | DL17 8EA | 2025 |
| Metro Ceramics Ltd | Builders | DL1 4JW | 2006 |
| Middle East Holding Ltd | Builders | DL1 4DE | 1893 |
| Mineworkings Remediation Specialists Ltd | Builders | DL17 9AN | 2014 |
| Ml Driveways-Patios & Groundworks Ltd | Builders | DL1 1GB | 2023 |
| Mmb Properties Ltd | Builders | DL1 3TF | 2001 |
| Monks Integrated Services Ltd | Builders | DL17 8DB | 2026 |
| Neasham Solutions Ltd | Builders | DL1 2PU | 2025 |
| Nesbit Property Ltd | Builders | DL17 0AW | 2021 |
| Nesbitt Security Systems Ltd | Builders | DL1 2FA | 2023 |
| Nevern Projects Ltd | Builders | DL17 8JH | 2005 |
| 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 |