| C D S Security Ltd | 0191 384 0071 | | 8-9 Dragon Lane, Dragonville Industrial Park, Durham, DH1 2XH |  Map & Directions |
| Onguard Elite Security Ltd | 0191 386 5417 | | 5 Friars Row, Durham, DH1 1HF | | Map & Directions |
| Citadel Security Systems | 01207 570707 | | White Wickets, Flint Hill Bank, Dipton, Stanley, DH9 9JD | | Map & Directions |
| R T Executive Services Ltd | 0191 387 1010 | | Old Rectory, Mains Park Road , Chester Le Street, DH3 3PU | | Map & Directions |
| Ensign Associates | 0191 385 5188 | | 75 Bourn Lea, Houghton Le Spring, DH4 4PF | | Map & Directions |
| Delta Security Systems | 0191 526 3634 | | 44 St. Cuthberts Close, Hetton-Le-Hole, Houghton Le Spring, DH5 9EU | | Map & Directions |
| Sheald Security Systems | 0191 388 5948 | | 14 Napier Close, Chester Le Street, DH3 4BN | | Map & Directions |
| Safe & Secure | 0870 765 8258 | | Po Box 171, Chester Le Street, DH2 1WX | | Map & Directions |
| Focus Security Services | 0191 512 6764 | | Kepier Hall, 1 Church Street, Houghton Le Spring, DH4 4DN | | Map & Directions |
| Bluemend | 0191 584 9597 | | Unit 21, Philadelphia Complex, Philadelphia, Houghton Le Spring, DH4 4UQ | | Map & Directions |
| Ultimate Protection Systems Ltd | 0191 492 0298 | | 10 Arndale Houses, Durham Road, Birtley, Chester Le Street, DH3 2PG | | Map & Directions |
| Micro Alarms | 0191 388 7055 | | 7 Brandon Close, Chester Le Street, DH2 3SY | | Map & Directions |
| G & W Electrical | 0191 410 8499 | | 28 Leyburn Place, Birtley, Chester Le Street, DH3 1PL | | Map & Directions |
| Vectra Security Installation Services Ltd | 0191 492 3636 | | 85 Wensley Close, Oustont, Chester Le Street, DH2 1SE | | Map & Directions |
| Pathfinder Security Services Ltd | 0191 517 0987 | | 5 Front Street, Hetton-Le-Hole, Houghton Le Spring, DH5 9PF | | Map & Directions |
| Identec Ltd | 0191 584 4084 | | 5 Mercantile Road, Houghton Le Spring, DH4 5PH | | Map & Directions |
| J P S Systems Ltd | 0191 372 1020 | | 27 St. Marys Drive, Sherburn, Durham, DH6 1RL | | Map & Directions |
| Retail Security Installations | 01207 592168 | | The Mill House, Consett, DH8 9EL | | Map & Directions |
| Crown Electrics | 0191 383 2300 | | 53 Front Street, Colliery Row, Houghton Le Spring, DH4 6LP | | Map & Directions |
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