London & Hertfordshire's Trusted Security Specialists
Crystal Integrated Security Systems Ltd (CISS) is an SSAIB-certified security company with over 45 years of experience designing, installing, and maintaining professional security systems for residential and commercial clients across London, Hertfordshire, Essex, and the wider Home Counties.
Over 45 Years Protecting Homes & Businesses Across the South East
Crystal Integrated Security Systems Ltd (CISS) was founded with a straightforward mission: to deliver professional-grade security to every home and business in London and the surrounding areas. What began as a small team of qualified engineers has grown into one of the most trusted independent security installers across London, Hertfordshire, Essex, and the Home Counties.
As an SSAIB-certified company, we design, supply, install, commission, and maintain the full range of electronic security systems — intruder alarms, CCTV, access control, fire alarms, and network infrastructure. Every system is engineered to British Standards and tailored to your specific premises and requirements.
The majority of our work comes through client referrals. We believe that speaks for itself. Our engineers are fully qualified, DBS-checked, and take genuine pride in the quality and finish of every installation.
Intruder Alarm Systems
Grade 2 compliant, Texecom, Pyronix & Orisec
CCTV Systems
HD & 4K IP cameras, Hikvision & Uniview
Access Control
Paxton, fob, smart card & biometric entry
Fire Alarm Systems
BS 5839 compliant, C-TEC & Advanced
Network Infrastructure
Cat5e/Cat6 structured cabling & LAN
24/7 Remote Monitoring
Live video verification & rapid response
Disabled Refuge Systems
Installation, testing & maintenance
Motorised Gates
Installation, programming & maintenance
Emergency Lighting
BS 5266 compliant, LED & battery systems
Fire Extinguishers
Supply, installation, servicing & certification
Security Guarding & Keyholding
Trained personnel, 24/7 availability
The CISS Difference
We're an independent company with no sales targets, no tie-ins, and no unnecessary upselling — just honest advice and high-quality installations backed by ongoing support.
SSAIB Certified
All our engineers are SSAIB-certified, ensuring every installation meets the standards required for police response and insurance compliance.
Tailored Solutions
We don't do off-the-shelf. Every system is designed around your specific property, risk profile, and budget.
Quality Workmanship
We stand behind our work with a 12-month installation guarantee and pride ourselves on clean, discreet cable runs and professional finishes.
Client-First Service
The majority of our work comes through referrals — a direct reflection of our commitment to honest advice and lasting client relationships.
Covering London, Hertfordshire, Essex & the Home Counties
CISS provides security installation and maintenance services across a wide area of the South East. Whether you're in central London, the Hertfordshire suburbs, or further into Essex and the surrounding counties, our engineers can survey your site and provide a tailored security solution.
- London
- Hertfordshire
- Essex
- Surrey
- Middlesex
- Home Counties
