Blake Fire and Security Systems

The Cost of a Home Alarm System - It's Complicated!

Date: 20 January 2023

Purchasing a house alarm system is an important investment in protecting your family home.

However, there are a number of elements that affect the cost of a home alarm system, and not everyone's alarm will cost the same amount...

Let's explore the factors so you can get a better idea of how much a bespoke system will cost you.

safe family.jpg

Passive infrared sensors

Passive infrared sensors are the most widely used motion sensors for home security purposes - even in pet friendly alarm systems!

They work by detecting body heat and can indicate the movement of unwanted intruders in your home.

These sensors typically have a range of up to 10 metres, with varied styles for different uses.

The total cost of your security system will depend on:

  • the type of sensors you buy
  • the size of your rooms and therefore the area the sensors can cover

Number of rooms in your home

You will need to take into account the size of your home and how many rooms will need to be monitored. Some homes require more coverage than others based on layout.

Sensors need to be placed in areas that are unobstructed and away from heat sources.

The more rooms you have, the more sensors you will require. Keep this in mind as sensor quantity will increase the price of your system.

Reliability and quality

Cheap or poorly installed equipment causes false alarms which, after 3 strikes, disqualifies you from having a Police Monitored Alarm System.

An SSAIB and NSI Gold accredited security installer, like Blake's, is essential if your home is to be properly protected with reliable, quality equipment.

What accreditations mean for the cost of your home alarm...

Accreditations like SSAIB and NSI Gold hold us accountable. A higher authority to ensure we give the highest standards of service to our customers. For us it means:

  • Quality control checks
  • Annual process checks
  • Tests to ensure we comply with British legislation and standards

For you, the homeowner, it means:

  • Quality, reliable equipment
  • A friendly, professional experience
  • Engineers that go the extra mile (like cleaning up all the mess and being careful not to wake the baby)
  • Complete peace of mind

Sure, choosing an unaccredited installer will reduce the cost of your home alarm system, but you could end up paying twice as much if the professionals need to come and fix a botched job!

Design and installation

A professional design will ensure your home has the protection it needs by taking into account the layout, the use of the rooms, entry points and other important details. It is vital to incorporate sensors in places where they are most effective and will not be disturbed.

Professional installers can offer great insight on what is needed and where, cutting down on false alarms, decreasing equipment faults and offering you greater peace of mind.

The value of expertise

SSAIB and NSI Gold accredited surveyors know how to utilise optimum sensor placement to offer the ultimate protection for your family home.

To trigger the alarm, at least two motion sensors must be activated. This system helps to eliminate false alarms. However, if the motion sensors are improperly placed, an intruder may only set off one sensor.

A professional will know where to place motion sensors within your home, ensuring that in the case of a break in, at least two motion sensors are activated to trigger the alarm.

Before Blake sensors.jpg

In the above image, you can see that two sensors have been placed in the hallway, yet no other room is equipped. What happens if the intruder enters through a window in an unprotected room?

As mentioned previously, two sensors must detect movement for the alarm to be activated. With this layout an intruder could easily avoid setting off that crucial second alarm, meaning they are now free to wander about your house, putting your property into a sports bag, pillow case or other handy receptacle!

Compare that to Blake's professional layout below...

After Blake sensors.jpg

There is a motion sensor in every room, increasing the likelihood of two or more sensors being activated during a break in. Additionally, the sensors are carefully positioned so that their range encompasses the whole room.

Mobile apps

Did you know that Smart Alarm Systems allow you to keep a watchful eye on your home, from your smartphone!

You can...

  • Partially set your alarm at night time - safeguard the downstairs while your family are free to roam upstairs
  • Set the alarm for the entire home at any time, from any place
  • Unset the alarm moments before entering your home - saving the rush to key in your code
  • Adjust alarm settings to suit your needs

A smart alarm system is definitely a nice-to-have compared to a must-have regular alarm system to protect your home! But, if the extra features appeal to you, this convenience will increase the cost of your security system.


When considering a security system, homeowners may think it all seems too pricey. There are plenty of DIY systems available, and many promise easy, quick installation.

But ask yourself: Do you have the expertise to set up the system and locate the devices correctly? While many DIY kits are inexpensive by comparison, if they are not set up correctly, the potential cost of getting it wrong is much more expensive!

Do it right the first time - hire an accredited professional.

Can you put a price on a safe family home?

Professionals who specialise in home security systems have expertise beyond simple installation.

If you do it yourself or decide to hire an unaccredited one-man-band to keep costs down, you don't really know what you are getting. Your alarm could stop working or a burglar might recognise a cheap installation and consider your home an easy target.

NSI-approved companies respond to emergencies within a four-hour period. That kind of response is never guaranteed with an unaccredited service. Simply put, a professional service will do an excellent job or they will be held accountable.

Do you need a burglar alarm? Take the quiz and find out how safe your home is!

You'd be surprised at what makes your home attractive to a burglar. Click here or tap the image below to take a five minute quiz and find out how safe your home is...


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This blog post is provided for general information only. It is not intended to amount to advice on which you should rely. Call Blake's on 01702 447800 to speak to one of our professionals for specialist advice before taking, or refraining from, any action on the basis of the content on our site.

Although we make reasonable efforts to update the information on our site, we make no representations, warranties or guarantees, whether express or implied, that the content on our site is accurate, complete or up to date.

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