What Grade of Intruder Alarm Does Your Business Need?
Why Grade Matters for Insurance
The grade of your intruder alarm system is not an abstract technical specification — it has direct, practical implications for your insurance cover. Commercial insurance policies routinely specify a minimum alarm grade as a condition of cover. If your installed system does not meet that grade, your insurer may refuse to pay out in the event of a break-in — even if the alarm was installed in good faith.
This is why getting the grade right is not optional. It is one of the first questions we ask when assessing a commercial premises for an intruder alarm system.
The Grade System Explained
Intruder alarm systems are graded under the European Standard EN 50131, which defines four grades of protection based on the assessed risk level of the premises. In commercial applications, Grades 2, 3 and 4 are the most commonly specified.
Grade 1
Low riskSuitable for residential premises with a low risk profile. Rarely specified in commercial applications. An intruder would be expected to have little or no knowledge of alarm systems.
Grade 2
Low to medium riskThe most commonly specified grade for commercial premises. Suitable for offices, retail units and businesses with standard cash or stock values. An intruder may have general knowledge of alarm systems and basic tools.
Grade 3
Medium to high riskRequired for premises where a higher level of protection is needed — typically high-value stock, cash-intensive businesses, or sites where the risk of a targeted attack is elevated. An intruder may have sophisticated knowledge of alarm systems.
Grade 4
High riskThe highest grade — required for critical national infrastructure, high-security facilities and premises where the consequences of a breach would be severe. An intruder may have specialist knowledge and access to sophisticated tools.
How to Determine the Right Grade
The appropriate grade for your premises should be determined by a formal risk assessment, taking into account the nature of your business, the value of assets on site, your location, previous incident history and your insurer's requirements. A competent, SSAIB-accredited security contractor will carry out this assessment and specify a system that meets both the technical requirements and your insurance obligations.
The key point is that you should never assume a grade without checking your insurance policy. And you should never accept a contractor's recommendation without asking them to confirm, in writing, that the specified system meets the grade required by your insurer.
Monitoring: ARC, Police Response or Keyholder?
The grade of your system is only one part of the picture. The monitoring response — what happens when the alarm activates — is equally important. Options include:
- Alarm Receiving Centre (ARC) monitoring — your system is connected to a 24/7 monitoring station that responds to activations and notifies the relevant parties
- Police response — available for qualifying premises, with an agreed response protocol in the event of confirmed activation
- Keyholder response — the monitoring station notifies a designated keyholder who can attend the premises
- Unmonitored (self-monitoring) — audible alarm only, with alerts sent directly to your smartphone via app
Concerned About the Grade of Your Current System?
We can assess your existing system and advise on whether it meets your insurance requirements.