| Thor Security | 01246 825437 | | 251 Shuttlewood Road, Bolsover, Chesterfield, S44 6PA |  Map & Directions |
| Security & Facilities Managment Services Ltd | 0870 241 8423 | | Securities House, 12 Pond Street, Chesterfield, S40 2LE | | Map & Directions |
| All Secure Security Solutions Ltd | 01246 554545 | | Beehive Works, Old Road, Chesterfield, S40 2QZ | | Map & Directions |
| Trust Security Systems Ltd | 0870 777 0629 | | 88 Derby Road, Chesterfield, S40 2EF | | Map & Directions |
| Ace Security Ltd | 01246 277270 | | Unit 1, Burley Close, Chesterfield, S40 2UB | | Map & Directions |
| Security Camera Systems Ltd | 01246 297567 | | 18 Upland Rise, Chesterfield, S40 2DD | | Map & Directions |
| B-Safe Security Systems Ltd | 0800 801 718 | | Storforth Lane, Chesterfield, S40 2TU | | Map & Directions |
| A & A Services | 0114 287 2787 | | 22 Laycock Avenue, Aston, Sheffield, S26 2FU | | Map & Directions |
| Smart Alarms | 0114 234 5513 | | 153 Middlewood Road, Sheffield, S6 4HB | | Map & Directions |
| Aspro Crest Ltd | 01709 543899 | | 280 Bawtry Road, Wickersley, Rotherham, S66 1JY | | Map & Directions |
| Wire Mesh Guards | 0114 278 6661 | | 28 Johnson Street, Sheffield, S3 8GT | | Map & Directions |
| Securitec | 01226 732021 | | The Magnolias, Burton Grange, Barnsley, S71 5QD | | Map & Directions |
| Securite Security Systems | 01709 702997 | | 160 Bawtry Road , Bramley, Rotherham, S66 2TS | | Map & Directions |
| Approved Alarms | 01226 713581 | | 12 Sunningdale Drive, Cudworth, Barnsley, S72 8ES | | Map & Directions |
| Abs Security Services Ltd | 01709 373424 | | Po Box 638, Rotherham, S60 9BQ | | Map & Directions |
| C M G Manufacturing | 0114 231 6673 | | 1 Hoyland Road, Sheffield, S3 8AB | | Map & Directions |
| Mayson Security Services Ltd | 0114 258 3791 | | 64-82 Broadfield Road, Sheffield, S8 0XL | | Map & Directions |
| M B Alarms & Electrical | 01226 207320 | | 17 Falmouth Close, Barnsley, S71 2QQ | | Map & Directions |
| Temple Security Ltd | 01709 874600 | | Unit 1, Farfield Park, Manvers, Rotherham, S63 5DB | | Map & Directions |
| Attendo Systems Ltd | 01709 389300 | | Unit 1, Centurion Business Park, Bessemer Way, Rotherham, S60 1FB | | Map & Directions |
| Tri Ex Security | 01909 550822 | | Unit 1 North Anston Business Centre, Houghton Road, North Anston Trading Estate, North Anston, Sheffield, S25 4JJ | | Map & Directions |
| Ble Ltd | 01246 436361 | | Manor House, Church Street, Eckington, Sheffield, S21 4BH | | Map & Directions |
| Secor Sheffield Ltd | 0114 243 4999 | | Banners Buildings, 620 Attercliffe Road, Sheffield, S9 3QS | | Map & Directions |
| Defence Shutters Services | 0114 244 1178 | | 411 Petre Street, Sheffield, S4 8LL | | Map & Directions |
| Active Securities | 07970 760915 | | Edale Road, Mastin Moor, Chesterfield, S43 3BB | | Map & Directions |
| Olympos Security Services | 01709 739003 | | 10 The Woodway, Sunnyside, Rotherham, S66 3RG | | Map & Directions |
| Jenbra Security | 0114 246 0001 | | Thorncliffe Hall, Thorncliffe Park Estate , Chapeltown, Sheffield, S35 2PX | | Map & Directions |
| Back Stage Security | 0114 221 6888 | | 159 Broad Oaks, Sheffield, S9 3HH | | Map & Directions |
| Bell Guarding Ltd | 0870 240 6214 | | 400 Cricket Inn Road, Sheffield, S2 5AX | | Map & Directions |
| Vault Vision Security | 01623 812722 | | Systems House, The Hill, Glapwell, Chesterfield, S44 5NB | | Map & Directions |
| Tandem Training Systems Ltd | 0114 272 7999 | | 90 Garden Street, Sheffield, S1 4BJ | | Map & Directions |
| Reflex Systems Ltd | 01709 701977 | | Lowton Way, Hellaby, Rotherham, S66 8RY | | Map & Directions |
| M C A Technics | 0114 288 1332 | | 15 St. Mary Crescent, Deepcar, Sheffield, S36 2TL | | Map & Directions |
| Securicom Systems Ltd | 0114 247 7794 | | 4 Hayes Court, Halfway, Sheffield, S20 4TS | | Map & Directions |
| Pyronix Ltd | 01709 700100 | | Pyronix House, Braithwell Way, Hellaby, Rotherham, S66 8QY | | Map & Directions |
| P A Protection Services | 0114 281 4848 | | Unit 2, 111 Halifax Road, Sheffield, S6 1LB | | Map & Directions |
| Wilkin Alarms Ltd | 0114 267 0011 | | 466-468 Ecclesall Road, Sheffield, S11 8PX | | Map & Directions |
| Alite Services | 0114 279 8485 | | Unit 20b Prospect House, City Road, Sheffield, S2 5HH | | Map & Directions |
| Schofield Alarms | 01709 893797 | | The Bungalow, Church St, Bolton-Upon-Dearne, Rotherham, S63 8LP | | Map & Directions |
| Bonnett Alarms | 01709 544396 | | 77 Northfield Lane, Wickersley, Rotherham, S66 2JA | | Map & Directions |
| S & R Installations Ltd | 01226 270880 | | Unit 10 Bradberry Balk Lane, Mitchells Enterprise Centre, Wombwell, Barnsley, S73 8HR | | Map & Directions |
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