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Case Studies: How Burglar Alarms Prevented Home Invasions

Burglaries are on the rise and, given the current global economic conditions and market slowdown, criminal activity will be on the rise for the foreseeable future.

The good news is that you can do something about it!

Criminals depend on a lack of security. Therefore, if you are a homeowner, the best way to keep your family and assets safe is to simply invest in a comprehensive burglar alarm system.

Burglar alarms are not only excellent deterrents, but they are by far one of the best ways to scare off criminals. These alarms use high-frequency and loud sounds to alert nearby people – and if there is one thing that criminals hate more than the police, it’s attention.

Since these alarms alert people and bring the area to attention, criminals often avoid invading homes with a burglar alarm system.

Still not sold on the idea of investing in a burglar alarm system for your home? Then read below to learn more about how these alarms work and a few interesting case studies that highlight how some homeowners were able to apprehend thieves with nothing but a burglar alarm system!


Let’s begin by discussing the types of burglar alarms.

There are mainly three main types of burglar alarms for home security. These alarms have different functionalities but all of them work to deter crime:

Bells-only burglar alarms

These are the standard and go-to burglar alarms in the UK. Not only are they easy to install, but they are also affordable and work extremely well.

As the name suggests, these alarms work by only sounding a loud siren using a bell component. These alarms depend on the alertness of nearby people and don’t send a notification to stakeholders or the relevant authority.

Bells-only burglar alarms use several sensors to detect potential break-ins so they can also be quite versatile! Since these alarms depend on the alertness of nearby people, they aren’t particularly effective in secluded and isolated areas.

Dialler/Monitored burglar alarms

These alarms work exactly like the bells-only alarm except that they also automatically contact someone in the case of an intrusion. This notification is sent out using a GSM or network.

The notification could be sent to either you, your family, or someone trustworthy that you’d like to be notified in case of a break-in.

The great thing about these alarms is that homeowners can opt for professional burglar alarm monitoring services and have a security company monitor their alarm 24/7, and also connect to the police if necessary.

These added features are why these alarms offer great peace of mind even when you’re away from home or live in a remote area.

Smart burglar alarms

Smart burglar alarms are what you get when you marry software and hardware together. These alarms are the future of security and provide comprehensive security using technologies like IoT (Internet of Things) and cloud computing.

Smart burglar alarms are managed via a mobile or web application that can send notifications to your phone in the same way as dialler alarms. Perhaps the best thing about these alarm systems is that they can be integrated with your phone and other security hardware like CCTV cameras, keypad locks, and lights.

For example, when the burglar alarm is triggered, the smart lights in your home would turn on to scare away any intruder. The alarm can also be turned on and off from your phone. This type of alarm provides added peace of mind and control even when you’re away from home and when you need to keep an eye on what’s happening back home.

The average cost of installing a smart home burglar alarm system would be high as compared to the other two variants, mainly because of all the complexities and added features involved. You can expect to pay a starting price of £1000.

All of these alarms are also available in wired and wireless versions.

Wired burglar alarms

Wired burglar alarm systems, as you might’ve guessed, use wires to connect to the sensors. These burglar alarms are the go-to for many people due to their ease of use.

However, they take longer to install since wires need to be properly set up for the alarm. Of course, this also makes them generally expensive as well. The good news is that, over the long term, they are cheaper to maintain due to less reliance on batteries.

Wireless burglar alarms

Wireless burglar alarm systems use Wi-Fi or radio frequency to connect to the sensors. They are also often smart since they connect to the internet and provide expanded control and capabilities.

They are easier to install, often offering a plug-and-play installation method. This makes them relatively cheaper to install since they require fewer labour hours. However, there is a catch!

The maintenance cost for these alarms is higher since they work via internal batteries that are required to be replaced every couple of years. Furthermore, if you opt for cloud computing or online services, then you might also need to pay monthly or annual subscription fees for the added features.


Burglar alarms on their own are pretty great at deterring crime and keeping invaders away from your home. But if you truly want comprehensive security then we recommend going for monitoring services on top of your installed hardware.

Monitoring services take the load off the users and allow the ultimate peace of mind! Instead of the users needing to do anything during a break-in, a monitored burglar alarm system can automatically detect and report the crime to a team that can immediately act on a priority basis.

These services are offered by professional security companies like Calder Security and can be a godsend for homeowners who live in areas that see frequent criminal activities.

While these services do add to the total security cost of your home, if you do the math, the total loss that you could face in the event of a burglary and the mental anguish that people can go through during a break-in makes the added cost much more logical.

Let’s look at the benefits of burglar alarm monitoring in detail:

Guaranteed response

Burglar alarm monitoring not only adds security but also offers urgency.

As soon as the alarm triggers, the system will not only notify authorities, but it may also send a notification to a private team that can take quick action! Whether it’s to contact you, your family, your keyholders, or the police; burglar alarm monitoring centres will always notify the relevant people.

By informing multiple people at once, the likelihood of catching the criminals goes up significantly.

Unlike non-monitored alarm systems, nothing is left to chance. This means that even if you are away from home, or even if no one notices the alarm going off on your property, the relevant authorities will reach your premises on a priority basis to attend the security call.

Using professional burglar alarm monitoring services, your safety is guaranteed by trained security specialists which can give you and your family peace of mind like no other.

Ultimate Deterrent for Home Invaders

Burglar alarms alone are enough to scare away criminals, but a monitored alarm is a force to be reckoned with!

Burglars regularly scout areas before they decide to rob a place. So, if they notice a burglar alarm system, they will usually think twice. However, if they find out that the alarm system is monitored, they will forget about your home and move on to their next mark.

This is because monitored alarm systems work on a priority basis. As soon as the alarm is triggered, the Alarm Receiving Centre (ARC) will first try and warn the intruders verbally or by sounding a loud siren.

Statistically, this usually does the trick and is a great way to scare off criminals. However, if they still proceed, then a team is dispatched simultaneously to apprehend the thieves before they can breach the other security measures in your home.

Reduce Noise and Avoid Fines

According to UK law, burglar alarms can only sound for 20 minutes before they are considered a public nuisance. After 20 minutes, if the alarm is still ringing, the police will visit your premises and charge you a fine. Believe it or not, this is a common problem in non-monitored or faulty alarm systems.

Monitored alarms are controlled via an ARC that can correctly identify an intrusion, avoid false alarms, and deactivate the alarm on time, stopping it from creating noise pollution.

Security Integration and Reports

One of the coolest ways that monitored and smart alarm systems work is by providing security personnel access to other security hardware in your home. These systems can also collect data and send detailed security reports to users as well.

The report contains information about potential break-ins, suspicious activity, and even details about past break-ins. You can receive weekly or monthly reports on your phone and can view the status of the alarm in real-time.

In many cases, if the alarm is triggered, a smart and monitored alarm system will notify multiple stakeholders at the same time and also allow security specialists to use other security hardware like keypad locks and CCTV cameras to keep the criminals contained in an area until the police arrive.


Thief caught after burgling 10 London pubs and shops.

John Delaney was considered a prolific thief who went on to rob not a few, but up to 10 different pubs and shops in London.

This thief scouted areas beforehand and picked areas that had considerable security gaps, despite having deterrents. In this case, even with CCTV cameras, the thief was able to circumvent security measures by picking up blind spots and entering/exiting the premises without being detected.

However, all it took was one wrong mistake to bring down this criminal. Delaney erroneously entered an area thinking that it had no security system in place. To his surprise, the back entrance had a discreet burglar alarm system that went off as soon as Delaney entered the premises.

The alarm system, combined with the quick action of the stakeholders on the property led to the thief’s arrest!

Four teenagers arrested after attempted burglary foiled.

These teenagers thought that they were being smart by entering a home from the garage.

The garage area is seldom secure and since it is secluded from the rest of the house, many people don’t feel the need to secure the area and just keep the garage door locked. However, this type of thinking is exactly what criminals depend on.

Thankfully, a Winterbourne resident followed all the security best practices and installed a burglar alarm system inside the garage area. When the teenagers entered the garage, the alarm went off and it didn’t take long before all the intruders were arrested!

Burglar caught after gardaí followed sound of nearby security alarm.

Alarms are excellent deterrents because they can alert nearby people of a robbery. In this case, an overconfident thief continued to rob a nearby store despite the alarm ringing throughout the property.

However, what makes this robbery so unbelievable is that the robber was thwarted twice in one day. Conor O’Flaherty began his day by trying to invade a nearby home in his neighbourhood.

The thief tried to force his way inside by breaking a window, however, the burglar alarm system activated and alerted the homeowners who began shouting at the thief who then promptly ran away.

Most people would’ve called it a day, but this thief tried his luck again at a nearby drugstore. However, as luck would have it, the store was also equipped with a burglar alarm that immediately triggered, alerting nearby authorities who quickly apprehended the crook.

That’s 2 for burglar alarms and 0 for Conor O’Flaherty.

Burglary suspect caught with pants down by Lakewood Police

Imagine being caught red-handed and with your..pants down.

That’s exactly what happened to a criminal in Colardo who entered a building not knowing that the area was protected by a burglar alarm system.

In this case, the thief not only made his way inside the property but also proceeded to take a few minutes out of their crime-filled schedule to go to the bathroom. By the time the intruder was done attending nature’s call, the authorities had already surrounded the area.

In this case, the burglar alarm immediately alerted not just the building stakeholders, but also the authorities who attended the call-out on a priority basis.


At Calder Security, we provide a comprehensive range of security solutions that include not just professional installation but also monitoring, maintenance, and repair services for your home burglar alarm systems.

We are members of the Master Locksmith Association (MLA), approved members of the Security Systems and Alarms Inspection Board (SSAIB), and also conform to all the relevant British and EU Standards.

We follow all the best practices in the industry and install only high-quality, state-of-the-art security systems.

We offer various levels of monitoring via a 24-hour monitoring centre using Dualcom and BT Redcare signalling, which is the most secure alarm monitoring system and the largest supplier of intelligent alarm signalling services in the UK.

We understand the importance of having to regularly maintain security systems since the inability to do so might result in serious faults and consequent vulnerabilities in your property’s security.

We provide professional maintenance checks and reminders for when the checks are due to help you stay compliant with the law and work fast to restore your security systems to excellent condition.

We offer a 24-hour call-out service for customers and can also repair systems not installed by us. Our engineers are highly skilled and can restore faulty systems to full working order in one visit.

Contact us here or call us at 0800 612 9799 to talk to our experts right away for more information on burglar alarms and how they can help prevent home invasions.

Photo by Chris Flexen on Unsplash