Hertfordshire & London's Trusted Security Specialists
Crystal Integrated Security Systems (CISS) is an SSAIB-certified security company with over 45 years of experience installing and maintaining professional security systems across London, Hertfordshire, Essex, and the wider Home Counties. We work with homeowners, landlords, and businesses of all sizes — from single-site residential properties to large multi-site commercial premises.
Our expertise covers the full spectrum of electronic security: intruder alarm systems, CCTV surveillance, access control, fire detection, and network infrastructure. Every system we design is tailored to your specific environment and risk profile — not an off-the-shelf package.
With the majority of our work coming through client referrals, our reputation for quality, reliability, and honest advice speaks for itself. Our engineers are fully qualified, DBS checked, and committed to delivering installations that meet the latest British Standards.
- SSAIB Certified — Intruder Alarms, CCTV & Access Control
- Serving London, Hertfordshire & the Home Counties
- 45+ Years of Security Installation Experience
- Free Site Surveys & Tailored Security Assessments
Intruder Alarms
CISS designs and installs intruder alarm systems for homes and businesses across London, Hertfordshire, and Essex. Our SSAIB-certified engineers supply, install, and commission multi-zone systems from leading manufacturers including Texecom, Pyronix, and Orisec — with annual maintenance contracts and 24/7 monitoring options available.
We Offer a Complete Service with a 12-Month Guarantee
We prioritise the needs of every client and deliver a fully personalised service — from initial consultation through to final handover and beyond.
Initial Consultation
We begin by understanding your property, risks, and security goals in a free on-site assessment.
System Design
Our engineers create a tailored security plan with full equipment specifications and pricing.
Professional Installation
Our certified team installs every component with precision, minimal disruption, and full testing.
Handover & Support
We walk you through the system, provide training, and remain on call for ongoing support.
