Burglar Alarms: A Guide to Keeping Trespassers Out

Burglar alarms are a great way to keep trespassers out of your home or business. Not only do they provide an audible warning that someone is attempting to break in, but they also often trigger a notification to the police or security company that can help apprehend the intruder. This guide will help you understand the different types of burglar alarms available and how to choose the right one for your needs.

What is a burglar alarm?

a kitchen interior with white cabinets and black lighting

A burglar alarm is a security system designed to discourage or deter intruders from breaking into a home or business. The most basic type of burglar alarm consists of a sensor that detects when a door or window has been opened and a loud siren that sounds when the sensor is triggered. More sophisticated systems may also include motion detectors, glass break sensors, and even cameras that can be monitored remotely.

While burglar alarms can be an effective deterrent, they are not foolproof; experienced burglars may still be able to bypass the system or cut the power to disable it. Nevertheless, a well-designed burglar alarm can give homeowners and business owners peace of mind, knowing that their property is better protected against unwanted intruders.

How does a burglar alarm work?

A burglar's worst nightmare is a blaring alarm that alerts the neighbourhood of their presence. But how do these alarms work? The most common type of burglar alarm is the passive infrared (PIR) sensor. This sensor is triggered when movement is detected in its field of view. PIR sensors can be used to protect both homes and businesses, and they are often used in conjunction with CCTV cameras. When the PIR sensor detects movement, it sends a signal to the control panel, which then sets off the alarm. Burglar alarms can also be placed on doors and windows, and they may include features such as motion-activated lights and sirens. By deterring burglars and alerting the authorities, these alarms play an important role in keeping your property safe.

How much does a burglar alarm cost?

The cost of a burglar alarm varies depending on the features and quality of the system. Basic systems can start as low as £50-100, but more advanced systems with features like motion detectors and remote monitoring can cost several thousand dollars. When choosing a burglar alarm, it is important to balance the cost of the system with the level of security it provides. A basic system may be sufficient for a small home with few valuable possessions, but a more expensive system may be necessary for a larger home with many valuables and vulnerable family members.

Do burglar alarms make a difference?

The idea behind a burglar alarm is simple: if an intruder breaks into a home, the alarm will go off, alerting the owner and scaring off the intruder. But do burglar alarms work?

Studies show that they can be effective in deterring burglaries. Homes with burglar alarms are less likely to be broken into than homes without them. One reason for this is that burglars are looking for easy targets. If they see a sign indicating that an alarm is present, they may move on to another house. Even if an alarm does not fully deter a burglar, it can still play an important role in protecting a home.

The loud noise of the alarm will often scare off the intruder and draw attention to the break-in, making it more difficult for the burglar to escape undetected. In addition, many burglar alarms are now connected to security systems that can immediately notify the police of a break-in. As a result, burglar alarms can make a difference in deterring and responding to burglaries.

Types of burglar deterrent
PIR sensors

Home security is a top priority for many homeowners. One way to deter burglars is to install PIR sensors. PIR stands for "passive infrared sensor." These sensors detect movement within a certain range and can trigger an alarm or other security measure. Burglars are typically looking for an easy target, so if they see that a home is protected by PIR sensors, they are more likely to move on to another property. In addition to serving as a burglar deterrent, some PIR sensors can also be used to detect smoke and carbon monoxide, making them a valuable addition to any home security system.

Door entry systems

deadlock door entry security

One of the best ways to deter burglars is to install an entry system. These systems can be mechanical or electronic, and they all work by preventing unauthorized access to your home. Mechanical systems, such as deadbolts and chain locks, are very effective at deterring burglars since they require physical force to break through. Electronic systems, on the other hand, use keypads or cards to control access. These systems are more convenient for homeowners, but they can also be more expensive. Either way, an entry system is a great way to deter burglars and keep your family safe.

Alarm bell boxes

Alarm bell boxes, or "audible only" systems, are a popular burglar deterrent. As the name implies, these devices emit a loud alarm when triggered, usually by an intruder breaking a window or door. The alarm is designed to scare off the burglar and alert neighbouring homes or businesses of the break-in. Many bell boxes also have a flashing light that serves as a visual deterrent. While audible-only systems are not as comprehensive as full security systems that include motion detectors and cameras, they can still be an effective way to deter burglars. For best results, it is important to place the bell box in a visible location near potential entry points. This way, it will be more likely to deter burglars and increase the chances of catching them in the act.

Door alarm sensors

Alarm systems are a common sight in both homes and businesses, but what many people don't realize is that there are different types of alarm sensors available. Door alarm sensors are one type of sensor that can be used to deter burglars. They work by detecting movement and then sounding an alarm. This can be a very effective deterrent, as it will cause the burglar to flee the scene, hopefully without any property being stolen. Door alarm sensors are usually very easy to install, and they can be used in conjunction with other security measures, such as CCTV cameras. In addition, door alarm sensors can also be connected to a home or business alarm system, providing an extra level of security.

How long does a burglar alarm go off?

Most burglar alarms have a timer that will turn the alarm off after a certain time, typically between 1-5 minutes. However, some alarms will continue to sound until they are manually turned off. In addition, some alarms are equipped with a battery-powered siren that will continue to sound even after the power has been cut off. This can be very effective in deterring burglars and helping to protect your home or business.

Do burglar alarms call the police?

Burglar alarms are a common security measure for homes and businesses, but do they call the police? The answer depends on the type of alarm system.

Traditional alarm systems are typically connected to a central monitoring station. When the alarm is triggered, the monitoring station will contact the police to report the incident. However, many newer alarm systems are equipped with cellular backup, which means that they can still work even if the power is out or the phone lines are down. In these cases, the alarm will send a signal to the police directly.

On the other hand, siren-only alarms won't contact the police, instead using a loud noise to deter any intruders. As a result, it is important to know what type of alarm system you have to determine how it will work in an emergency.

How loud is a burglar alarm?

The sound of a burglar alarm can vary depending on the type of system and the location of the sensors. Most systems are designed to emit a loud, continuous siren that will quickly notify homeowners and neighbours of a potential break-in. The loudest alarms can reach up to 120 decibels, which is roughly equivalent to the noise made by a jet engine. At this volume, the sound can be painful and even damaging to hearing. Thankfully, many burglar alarms include an adjustment knob that allows homeowners to set the volume to their desired level. This ensures that the alarm will be loud enough to deter intruders, but not so loud that it damages hearing.


Burglar alarms are an important security measure for both homes and businesses. They act as a deterrent to burglars and can help to protect property in the event of a break-in. There are many different types of burglar alarm systems available, each with its benefits and drawbacks. It is important to choose the right system for your needs and install it correctly for maximum effectiveness. In addition, burglar alarm systems should be tested at least monthly to ensure that they are working properly.


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