Unmonitored Alarm Systems UK: A Comprehensive Guide
As Gary Pearce, I have been installing CCTV, WiFi, data cabling and home security systems in properties across the UK for over 20 years. Unmonitored alarm systems are a popular choice for homeowners who want to protect their property and belongings without the ongoing costs of professional monitoring. In this guide, I will cover everything you need to know about unmonitored alarms in the UK, including how they work, what components you need, installation options, and the costs involved.
How Unmonitored Alarm Systems Work
An unmonitored alarm system detects intrusion using sensors placed on doors, windows, and in rooms, then alerts you through a loud siren and often a notification on your smartphone. The key difference from a monitored system is that no third party receives the alert. There is no alarm receiving centre, no keyholder response, and no police call-out. You are responsible for responding to the alarm.
This might sound like a disadvantage, but unmonitored systems have significant benefits. They have no monthly subscription fees, making them far cheaper over the long term. They are simpler to install and maintain. And they put you in full control. Many modern unmonitored systems connect to your phone, so you know immediately if something happens and can check live camera feeds to decide whether to call the police yourself.
System Components
A basic unmonitored alarm system consists of the following components. The control panel is the brain of the system. It receives signals from sensors, processes them, and triggers the siren if an intrusion is detected. Modern control panels are usually wireless and can be controlled via a keypad, key fob, or smartphone app. A good-quality wireless control panel costs between 80 and 200.
Door and window contacts are magnetic switches that detect when a door or window is opened. They consist of two parts: a sensor on the frame and a magnet on the door or window. When the gap between them increases beyond a set distance, the alarm triggers. Contacts cost 8 to 20 each. Most homes need between 6 and 12 contacts to cover all ground-floor entry points.
PIR motion detectors sense body heat and movement within a room. A PIR sensor with a detection range of 10 to 12 metres and a 90-degree field of view costs 20 to 50. Position them in hallways and rooms where an intruder would have to pass. Avoid placing them in rooms with pets unless the sensors are pet-immune, which are rated up to 25 kg and cost slightly more.
The external siren or sounder is the most visible part of the system. A combined siren and strobe light with a tamper switch costs 40 to 100. The siren should produce at least 100 decibels at 1 metre. The strobe light provides a visual deterrent. Most local councils require external sirens to cut off automatically after 20 minutes to comply with the police's ACPO policy.
DIY versus Professional Installation
DIY installation of unmonitored alarm systems is very achievable. Most wireless systems use adhesive pads or screws to mount sensors, and the control panel communicates with all components via radio frequency. The entire system can be installed in a few hours. Brands such as Yale, Ring, and Ajax offer well-regarded DIY systems that are popular in the UK.
However, professional installation has advantages. A qualified installer will ensure that sensors are positioned for optimal detection, the control panel is in the best location for signal reception, and the system is compliant with BS EN 50131. They will also test every component thoroughly. Professional installation of a wireless unmonitored system costs between 200 and 500 depending on the number of sensors and the complexity of the property.
Wired systems require professional installation because cables must be run through walls, under floors, and in ceiling voids. Wired systems are more reliable than wireless because they are not subject to signal interference or battery failures. They also tend to be more secure because the sensors cannot be jammed by wireless jammers. However, installation is more disruptive and costly, typically 500 to 1,000.
British Standards Compliance
While unmonitored alarm systems are not legally required to meet any specific standard, installing a system that complies with BS EN 50131 provides assurance of quality and reliability. BS EN 50131 Grade 2 is the minimum standard recommended for domestic properties. Grade 2 systems are designed to detect intruders using common tools and provide a good level of protection.
If you have a monitored alarm system installed, your insurance company may require it to meet a specific grade. Unmonitored alarms are less likely to attract insurance discounts because there is no guarantee that anyone will respond to the alarm. However, a visible alarm box alone can reduce your risk of burglary and may still result in a modest premium reduction.
False Alarm Prevention
False alarms are a nuisance and can damage your relationship with neighbours. The most common causes of false alarms are poorly positioned PIR sensors, low batteries, and user error. To minimise false alarms, follow these guidelines.
Position PIR sensors away from windows, radiators, air vents, and direct sunlight. These can cause rapid temperature changes that trigger the sensor. Secure any loose objects that could fall and be detected by a sensor. Ensure all users know how to arm and disarm the system correctly. Test the system monthly and replace batteries in all sensors annually.
Cost Overview
| Component | DIY Cost Range | Pro Install Cost Range |
|---|---|---|
| Wireless alarm kit (6-8 sensors) | 100 - 300 | 150 - 400 |
| Additional door/window contact | 8 - 20 | 15 - 30 each |
| Additional PIR sensor | 20 - 50 | 30 - 60 each |
| External siren with strobe | 40 - 100 | 60 - 120 |
| Installation labour (wireless) | - | 200 - 500 |
| Installation labour (wired) | - | 500 - 1,000 |
| Smartphone module/hub | 30 - 80 | Included |
| Annual battery replacement | 10 - 30 | - |
Popular Unmonitored Alarm Systems in the UK
Several brands are widely available and well regarded in the UK market. Yale offers a range of wireless alarm kits starting at around 100 for a basic system with a control panel, two door contacts, one PIR, and a siren. Their systems are easy to install and support smartphone connectivity. Ring Alarm systems start at around 200 and integrate with Ring doorbells and cameras. They offer optional professional monitoring for a monthly fee, giving you the flexibility to upgrade later.
Ajax Systems make higher-end wireless security equipment that is popular with professional installers. Their sensors have excellent range and reliability, and the smartphone app is highly rated. A professionally installed Ajax system costs between 600 and 1,500 depending on the number of sensors and the level of integration.
Final Thoughts
Unmonitored alarm systems offer a cost-effective solution for securing your home without long-term subscription fees. With a wide range of DIY and professionally installed options, there is an unmonitored system to suit every property and budget in the UK. Choose a system from a reputable brand, ensure sensors are positioned correctly, and test the system regularly to keep it in good working order.
About the Author
Gary Pearce is a leading expert in CCTV, WiFi, data cabling and home security installations for properties across the UK. With over 20 years of experience and qualifications from City and Guilds and the NICEIC, Gary provides professional advice and installation services. Call Gary on 07830 638 337 to discuss your alarm system requirements.
Article by Gary Pearce
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