Intruders who target homes to make their living are predictable.

They will cruise a street and look for  homes that have easy access to the side windows or back of the house.

After knocking on the front door and confirming no one is home,  they will head around to the side of your home. After checking that  a neighbour can’t see them, they will use a screwdriver or some other tool and try to force a window or door open. It’s surprisingly simple to do as our apprentice, Tara demonstrates in these very short videos:

So it makes sense to electronically protect our doors and windows.  If an intruder opens or smashes a door or window the alarm will be triggered immediately. By having the alarm trigger at  the point of entry you stand a much better chance or preventing a break in.

The goal of this article is to demonstrate how to do this reliable, whether the home is occupied or not.

Magnetic Reed Switches

Magnetic reed switches have been used for years to protect doors and windows. When installed correctly they are reliable and will rarely give a false alarm. But they can only detect an intruder if the window is opened.


But what if the window is not opened?


In the videos above, the window had a reed switch installed, so if the alarm had been switched on (it wasn’t for this demo) the sirens would have sounded as soon as Tara opened the window.

So it makes sense to have an alarm that detects a break-in through a door or window. By having the loud inside and outside sirens trigger at the very moment a breech occurs, you will very likely deter the intruder from entering your home.

However, had the window been smashed instead of forced open (it happens) , no alarm would have occurred and the intruder would have entered the home, and headed for the master bedroom to search for jewellery and other items that could readily sold for cash.

So if we’re serious about detecting an intruder at the point of entry we need to not only detect if the door or window is forced but also smashed.

. Vibration Sensors

A degree of force is required to smash a window or break through a door. A vibration sensor responds to this force and triggers the alarm immediately, achieving our aim of detecting the intruder at the point of entry. With careful installation and set-up these devices are also very reliable and won’t cause false alarms.


So by installing a reed switch and a vibration sensor on every door and window we have created a viable perimeter alarm system. When installed and set up correctly it would be very difficult for an intruder to get into the home without triggering the alarm.

Problem solved…….almost

This set-up all works fine when everyone has left the house for the day.

But what if you want to have the doors and windows protected when you’re home? When you and your family are sleeping for example?

Think about it for a minute:

Everyone is in bed. You’ve turned the perimeter system on and you can sleep soundly knowing that you’ll be alerted to a break-in.

But what if our intruder forces open at window at 3 o’clock in the morning? Of course the alarm will sound and most likely scare the intruder away – the same as in the previous scenario.

But think what that experience is like for you, the homeowner.

You were in a deep sleep but you are suddenly jolted awake by the piercing sound of 2 super-loud sirens.

What would you do? Rush to turn the alarm off? Run to the nearest window to see what was going on? Hide under the covers?

Other members of the household are also awake and confused. Not to get too dramatic about it but…

With all that going on, would you even stop to consider that a burglar had ignored the siren and was now inside your home?

The point here is that a perimeter system that protects doors and windows is perfect for when the home is unoccupied but isn’t the best solution for when you’re sleeping.


Early Warning Perimeter Systems


To be completey thorough in designing a perimeter alarm system we need to consider an early warning perimeter system that alerts you with a persistent, yet not ear-shattering tone that lets you know someone is on your property:

not inside,

not almost inside,

but perhaps on the front path heading to your door, or approaching the back yard or side of the house

or even at the car port or garage.

New technology wireless perimeter systems provide an early warning giving you a chance to investigate a breech of your home’s perimeter and deter an intruder before he gets anywhere near your vulnerable entry points.

Theses systems are relatively cheap and can be installed by a competent handyman.

Read more about these systems here

If you’re interested in learning more about securing your doors and windows give our experts a call for expert advice you can count on.




Leave a Reply

Your email address will not be published. Required fields are marked *