We specialise in Intruder Alarms
At Sigma Fire & Security Ltd, we specialise in providing professional intruder alarm systems in London & Kent. Whether you’re a homeowner, landlord or business operator, our advanced alarm solutions are designed to deter intruders, alert you instantly and integrate with monitoring services for full-time protection.
Get in touchOur Intruder Alarm Solutions
Wired Systems
Ideal for new installations or full rewires, offering robust, tamper-resistant security.
Wireless & Hybrid Systems
Flexible solutions for retrofit, multi-unit buildings or where minimal disruption is needed.
Perimeter & Exterior Protection
Protect boundaries, gates, external areas and vulnerable zones beyond just internal spaces.
Smartphone Integration & App Control
Arm/disarm remotely, receive push-alerts, view system status on the go.
Monitored Alarms
Connect to our 24/7 Alarm Receiving Centre for immediate alerting and response in emergencies.
Serving London & Kent
Our London-based team covers all zones across the borough and wider South East London (including Beckenham, Orpington, West Wickham etc). We know the local area and layout of homes and businesses, so we can install intruder alarm systems in London & Kent that meet your insurance requirements and local authority recommendations.
The Process
Simple → Effective → Secure
Free site survey
We visit your London property, assess layout, risk areas and required level of monitoring.
Tailored design & quote
We propose the right system, integration options, monitoring levels and pricing.
Professional installation
Our engineers install with minimal disruption, test thoroughly and hand over full instructions.
Maintenance & monitoring
Ongoing servicing and optional 24/7 monitoring ensure your system remains reliable and compliant.
Contact Form
Contact Details
Ready to secure your London or Kent property with best-in-class fire & security protection? Contact Sigma Fire & Security today for a no-obligation site survey.
FAQs
Do I need planning permission to install an intruder alarm in my property?
Typically, no planning permission is required for internal alarm systems in residential or commercial properties. However, if you’re installing external sirens, sensors on heritage buildings, or within a Conservation Area in London or Kent, it’s worth checking with your local authority.
How long will the installation take?
For many standard home systems the installation can be completed in one day. Larger commercial sites with wiring, multiple zones or external sensors may take 1–2 days. We will give you a clear schedule during the free site survey.
Can the intruder alarm system be monitored 24/7?
Yes. We offer optional monitored services linked to a certified Alarm Receiving Centre. This means if the alarm is triggered, the monitoring centre can alert you or dispatch a responder depending on the service level.
Will it integrate with other security systems like CCTV or access control?
Absolutely. Modern intruder alarms can be integrated with CCTV cameras, remote app control, access systems and smart home platforms. This enables you to manage multiple security layers from one interface.
What happens if there’s a power cut or connection issue?
Our systems are designed to continue functioning during power outages thanks to backup batteries. For internet-connected systems, we can provide alerts if the connection drops, and local detection will still operate.
How often does the system need maintenance and servicing?
To keep your system reliable and compliant (required by insurance), we recommend at least one annual service check and a 6 monthly check if your system is monitored. This includes verifying sensors, batteries, sirens and software updates—ideal for ensuring continuous protection in London & Kent.
Accreditations
We’re accredited by the UK’s leading certification bodies — SSAIB and BAFE — and proud members of the Fire Industry Association (FIA), the UK’s largest fire protection trade body. This gives you complete confidence that our work meets the highest standards for safety, compliance, and professionalism.