Castle Alarms

Dear Valued Customer,

We are writing to inform you that as of 31st January 2022, ZSL Security Systems LTD has purchased Castle Alarms LTD.

We are delighted to be able to continue to offer the same level of timely, professional, and high-quality service to both Castle and ZSL customers new and old under the ZSL name. ZSL are proud to operate under NSI standards.

ZSL can meet all your domestic and business security needs including:

  • Access Control / Gate Automation
  • CCTV
  • Fire Alarms
  • Intruder Alarms

We are also happy to announce the launch of ZSL Electrical with our NICEIC accredited electricians offering a range of services which include:

  • Full Rewires
  • Remedial Works
  • Fuse Box/Consumer Unit Upgrades
  • Electrical Inspection Condition Reports (EICR/Landlord) Certificates
  • PAT Testing

You do not need to contact us as all customer information for both Castle and ZSL customers is stored securely on our database. All existing Castle contracts will be transferred. However, if you need us, we are here, day or night! Our contact details can be found below:

Telephone: 01773 811911 or 01773 856800


Visit our website:

Or pop in and see us at our new premises at 29 Nottingham Road, Eastwood, Nottingham NG16 3AN

We would like to take this opportunity to thank you for your continued custom and look forward to hearing from you soon!

The ZSL Team