| Hanningfield Security Services Ltd | 01277 356575 | | Longmeadow, Pennys Lane, Margaretting, Ingatestone, CM4 0HA |  Map & Directions |
| Maritime Asset | 01245 364062 | | 159 Main Road, Great Leighs, Chelmsford, CM3 1NP | | Map & Directions |
| Specialist Protection Services Ltd | 01279 647888 | | Braemer House, Water Lane, Stansted, CM24 8BJ | | Map & Directions |
| Unitech Systems Ltd | 01245 474924 | | 34 Chelmerton Avenue, Chelmsford, CM2 9RF | | Map & Directions |
| Adml Ltd | 0800 085 6459 | | 63 St. Anthonys Drive, Chelmsford, CM2 9EH | | Map & Directions |
| Reliance Security Services Ltd | 01245 496866 | | Fourth Floor Bray House, 101 New London Road, Chelmsford, CM2 0PP | | Map & Directions |
| Asset Security Management Ltd | 01279 721999 | | 111 London Road , Sawbridgeworth, CM21 9JJ | | Map & Directions |
| Red Spot | 01376 339725 | | Braintree Enterprise Centre, 46 Springwood Drive, Braintree, CM7 2YN | | Map & Directions |
| Active Security Group Ltd | 01279 420016 | | Horsecroft Place, Harlow, CM19 5BT | | Map & Directions |
| Headline Security Management | 01277 260500 | | 2 Weald Road , Brentwood, CM14 4SX | | Map & Directions |
| Holmesdale Integrated Security Systems Ltd | 01279 722299 | | 111 London Road, Sawbridgeworth, CM21 9JJ | | Map & Directions |
| Crown Security Systems | 01277 228828 | | 14 Plashet Gardens, Brentwood, CM13 2BS | | Map & Directions |
| Grosvenor Technology Ltd | 01279 838000 | | Millars Three, Southmill Road, Bishop's Stortford, CM23 3DH | | Map & Directions |
| Gainsborough Events & Security Services | 01279 776161 | | Saven End, Farnham, Bishop's Stortford, CM23 1HJ | | Map & Directions |
| Gardiner Security Ltd | 01245 464044 | | 2 Montrose Road, Chelmsford, CM2 6TX | | Map & Directions |
| Clearview Communications Ltd | 01245 214104 | | 33 Robjohns Road, Chelmsford, CM1 3AG | | Map & Directions |
| React Security Systems | 01245 351799 | | 114 Vicarage Road, Chelmsford, CM2 9BT | | Map & Directions |
| All Tag Security Ltd | 01279 453008 | | 13 The Spire Green Centre, Harlow, CM19 5TR | | Map & Directions |
| Com Uk Ltd | 01621 743318 | | 2 Marine Parade, Mayland, Chelmsford, CM3 6AP | | Map & Directions |
| Bradling Security Ltd | 01376 328100 | | Suite 11 The Centre, Lower Chapel Hill, Lakes Industrial Park, Braintree, CM7 3RU | | Map & Directions |
| Mayfair Security Ltd | 01621 772580 | | 62 Hillside Road, Southminster, CM0 7AL | | Map & Directions |
| Hanovia Control Ltd | 01621 742029 | | Hanovia House, The Esplanade, Mayland, Chelmsford, CM3 6FD | | Map & Directions |
| Central Access Systems Ltd | 01277 363666 | | Fyfield Business & Research Park, Unit6 Fyfield Road , Ongar, CM5 0GN | | Map & Directions |
| Just Cctv Ltd | 0870 010 1111 | | Esgors Farm, High Road, Thornwood, Epping, CM16 6LY | | Map & Directions |
| Wellington Security Products | 01371 831731 | | Po Box 5991, Thaxted, Dunmow, CM6 2WS | | Map & Directions |
| Abcon Services Ltd | 01708 221222 | | 20 St. Thomas Road, Brentwood, CM14 4DB | | Map & Directions |
| Electronic Video Security | 01992 524001 | | 284 High Road, North Weald, Epping, CM16 6EG | | Map & Directions |
| Basenet Services Ltd | 01245 266026 | | 240 Rainsford Road, Chelmsford, CM1 2PN | | Map & Directions |
| Icts | 01279 680523 | | Enterprise House, Bassingbourn Road, London Stansted Airport, Stansted, CM24 1QW | | Map & Directions |
| Aurora Security | 01245 362362 | | Longlands Farm, Boreham Road, Great Leighs, Chelmsford, CM3 1PR | | Map & Directions |
| Stevens Security | 01279 813345 | | 7 Churchill Corner, Stansted, CM24 8UA | | Map & Directions |
| Thorndon Security | 01245 475476 | | Unit 2 Parklands Farm, Lower Green, Galleywood, Chelmsford, CM2 8QS | | Map & Directions |
| Urmet Domus Communication & Security Ltd | 01371 874923 | | 7 Chelmsford Road, Oak Industrial Park, Dunmow, CM6 1XN | | Map & Directions |
| Jmh Technology | 0845 053 7457 | | Unit 3 Highlands Farm, Berden, Bishop's Stortford, CM23 1AB | | Map & Directions |
| Kirkman Security Systems | 01376 344986 | | 11 Byng Gardens, Braintree, CM7 9TJ | | Map & Directions |
| Time Security | 01245 614122 | | 612 Galleywood Road, Chelmsford, CM2 8BY | | Map & Directions |
| Meteor Parking & Security | 0870 060 1001 | | Bassingbourn House Mid Stay Car Park, Thremhall Avenue, London Stansted Airport, Stansted, CM24 1PZ | | Map & Directions |
| Herts & Essex Alarms Ltd | 01376 551135 | | 9 Queens Gardens, Panfield, Braintree, CM7 5AH | | Map & Directions |
| Advance Security Electronics | 0870 165 1999 | | East Hanningfield Road, Sandon, Chelmsford, CM2 7TP | | Map & Directions |
| Integrity 2000 | 01277 262000 | | Po Box 2222, Great Warley, Brentwood, CM13 3HY | | Map & Directions |
| Granville Ltd | 01277 201302 | | 208 Hutton Road, Shenfield, Brentwood, CM15 8NR | | Map & Directions |
| Telmark Security Systems | 01279 832223 | | The Coach House, 9 Glan Avon Mews, Harlow, CM17 9DZ | | Map & Directions |
| Gold Seal Security Installations | 0800 542 9122 | | 24 Yeomans Close, Thorley, Bishop's Stortford, CM23 4EU | | Map & Directions |
| I C T S Ltd | 01279 680186 | | Business Aviation Terminal, First Avenue , London Stansted Airport, Stansted, CM24 1QR | | Map & Directions |
| Hewes Security | 01245 321114 | | Cutlers Road , South Woodham Ferrers, Chelmsford, CM3 5WA | | Map & Directions |
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