Intruder alarm systems are an important part of protecting commercial buildings, helping organisations detect unauthorised access, safeguard assets and respond to potential security incidents. However, an effective alarm system involves considerably more than installing movement detectors and an external sounder.
Facilities managers need to consider the risks associated with individual buildings, the appropriate level of detection, how alarms are monitored and what happens when an activation occurs.
A system that triggers repeatedly because of environmental conditions may become a source of frustration. Another could identify an intrusion but fail to generate an effective response because monitoring arrangements or keyholder responsibilities are unclear.
For organisations operating multiple premises, maintaining consistent standards and reliable records can create further challenges.
The National Security Inspectorate (NSI) recommends selecting appropriately approved providers and systems designed, installed and maintained to recognised standards.
For FM teams, the most useful buying question is therefore not simply:
At a Glance: What FM Teams Should Compare
| Area to assess | Why it matters | What to check |
|---|---|---|
| Risk and coverage | Different buildings require different protection | Entry points, vulnerable areas and suitable alarm grades |
| Detection technology | Determines how potential intrusions are identified | Door contacts, motion detectors and environmental suitability |
| Monitoring and response | Converts an activation into action | Alarm receiving centres, keyholders and police response eligibility |
| False alarm management | Reduces disruption and protects response arrangements | Verification, detector placement and maintenance |
| Integration | Helps coordinate wider building security | CCTV, access control and FM system connections |
| Maintenance and cost | Supports long-term reliability | Servicing, backup power, certification and whole-life costs |
Start with a Building-Specific Risk Assessment
Before comparing equipment, facilities managers should establish what the alarm system needs to protect.
A warehouse containing valuable stock may require different detection arrangements from a multi-tenanted office, school or retail premises.
Relevant factors include building layout, opening hours, access arrangements, the value and nature of assets, and the potential consequences of an intrusion.
The UK Government’s ProtectUK guidance recommends a layered approach to physical security, using complementary measures to deter, detect and respond to threats.
An intruder alarm should therefore form part of the wider building security strategy.
FM teams should identify vulnerable entry points, areas requiring additional protection and circumstances where authorised activity might trigger an alarm.
The objective is to specify appropriate coverage rather than simply install the greatest possible number of detectors.
Understand Alarm Grades and Standards
Commercial intruder alarm systems are subject to recognised technical standards.
The BS EN 50131 series establishes requirements for intruder and hold-up alarm systems, including different security grades reflecting the level of risk and the sophistication of potential attacks.
UK installations are also commonly specified against PD 6662, which provides a framework for applying relevant standards.
The appropriate grade should be established through a risk assessment and consideration of any insurer requirements.
The NSI advises businesses to confirm whether their insurer specifies a particular alarm grade.
Buyers should therefore avoid assuming that a system suitable for a small office is automatically appropriate for a higher-risk commercial environment.
A competent provider should explain the recommended specification, the standards being applied and any relevant certification.
Compare Wired, Wireless and Hybrid Systems
Intruder alarm systems may use wired detectors, wireless devices or a combination of both.
Wired systems can provide reliable connections but may involve additional cabling and installation work.
Wireless systems may be easier to install in certain existing buildings, particularly where extensive cabling would create disruption.
However, they introduce considerations around radio communication, device batteries and environmental conditions.
Hybrid systems can provide flexibility where a building has existing cabling but requires additional detectors or changes to coverage.
Adept Fire & Security offers both hard-wired and wireless intruder alarm solutions for commercial and other properties.
FM teams should compare options against building characteristics, maintenance requirements and future changes.
The most appropriate technology is the one that provides reliable coverage within the actual operating environment.
Select the Right Detection Technology
Intruder alarm systems can use different devices to identify potential unauthorised activity.
Door and window contacts detect opening, while passive infrared detectors respond to changes in infrared energy associated with movement.
Other applications may require specialist detection technologies.
Buyers should consider the suitability of each detector for its intended location.
For example, environmental conditions, airflow, temperature changes or normal operational activity may affect performance.
Incorrect detector placement can contribute to unwanted activations.
FM teams should ask suppliers to explain the proposed detection arrangement and how coverage has been assessed.
A well-designed system should identify relevant activity while minimising unnecessary disruption.
Decide Whether Remote Monitoring Is Required
An audible-only alarm may deter some intruders and alert people nearby.
However, it does not guarantee that somebody will investigate or respond.
Remote monitoring services can provide additional oversight by sending alarm signals to an alarm receiving centre (ARC), where operators assess activations according to agreed procedures.
The NSI explains that monitored systems can support keyholder and, where the applicable requirements are met, police response arrangements.
COAT Facilities Group includes intruder alarm installation, maintenance and monitoring within its fire and security services.
Adept Fire & Security also provides alarm solutions with associated monitoring options.
Buyers should establish exactly what monitoring includes, how signals are verified and which actions operators will take.
An alarm activation is only useful if somebody knows what to do with it.
Understand Police Response Requirements
Businesses should not assume that any remotely monitored alarm automatically qualifies for police attendance.
The National Police Chiefs’ Council (NPCC) Security Systems Policy sets out the requirements for systems seeking police response.
These include relevant standards, appropriately approved providers, monitoring arrangements and a police Unique Reference Number (URN).
ProtectUK advises organisations to establish whether their security provider is police compliant and can obtain the necessary URN.
The NSI also explains that repeated false alarm activations can affect police response status.
FM teams should therefore ask suppliers to confirm whether the proposed system is eligible for police response, what process is required and what ongoing conditions apply.
Even where a system qualifies, actual attendance remains subject to police operational priorities.
Control False Alarms
False alarms can create unnecessary disruption, generate costs and undermine confidence in a security system.
They can also affect eligibility for certain police response arrangements.
Common contributing factors may include unsuitable detector placement, environmental conditions, user error and equipment faults.
Facilities managers should therefore consider false alarm prevention during both specification and ongoing operation.
Users need appropriate training, while detectors and control equipment should be maintained in accordance with relevant requirements.
Alarm verification can also help distinguish genuine incidents from unwanted activations.
The NSI highlights the importance of regular maintenance and effective management of false alarms.
Buyers should establish how the provider investigates recurring problems and what support is available when systems begin generating unnecessary alerts.
Establish Clear Keyholder and Response Procedures
An alarm system should have a defined process for responding to an activation.
This may involve an internal keyholder, a contracted security provider or another authorised responder.
ProtectUK recommends establishing suitable keyholder arrangements, including contactability and the ability to provide access.
FM teams should consider who is responsible for responding outside normal working hours and what happens when the primary contact is unavailable.
Response procedures should also prioritise personal safety.
Employees should not be expected to enter premises where criminal activity may be taking place.
The agreed process should explain how incidents are escalated, who can authorise further action and how the building is secured afterwards.
A well-defined response plan is as important as the alarm equipment itself.
Integrate Intruder Alarms with Wider Building Security
An intruder alarm is rarely the only security system operating within a commercial building.
CCTV, access control, lighting and other technologies may all contribute to protecting the premises.
ProtectUK recommends integrating complementary security measures where appropriate.
For example, an alarm activation might prompt a review of relevant CCTV footage or help security personnel identify which area requires attention.
However, integrations should be designed carefully.
FM teams need to understand which systems exchange information, what happens if a connection fails and whether the arrangement introduces unnecessary complexity.
BAM UK & Ireland provides integrated facilities management services incorporating security alongside wider building operations.
COAT Facilities Group also combines intruder alarms, CCTV, access control and related FM services.
These broader capabilities may be relevant where organisations want to coordinate security arrangements through existing FM contracts.
Consider Multi-Site Management
Organisations managing several buildings can face challenges when different sites use separate alarm providers, monitoring contracts and maintenance arrangements.
This can make it difficult to maintain consistent standards or identify systems requiring attention.
FM teams should consider whether a proposed solution supports centralised visibility of relevant alarm events, faults and maintenance activity.
However, individual premises may still require different levels of protection.
A high-value distribution centre should not necessarily use the same specification as a small administrative office.
The objective should be consistent governance combined with appropriate site-specific design.
Evaluate Installation and Retrofit Requirements
Commercial buildings can present practical challenges for alarm installation.
Existing cabling, occupancy patterns, construction materials and access restrictions may all influence the work required.
FM teams should establish whether installation can be completed without significant disruption.
For occupied premises, it may be necessary to schedule work outside normal operating hours or coordinate it with other maintenance activities.
Edmundson Electrical supplies intruder alarm, CCTV and access control products through its electrical wholesale network, supporting contractors and project teams sourcing relevant equipment.
However, equipment procurement should be distinguished from professional system design, installation and certification.
Buyers should establish who is responsible for each stage of delivery.
Make Maintenance Part of the Buying Decision
Intruder alarm systems require ongoing maintenance to remain reliable.
Detectors, control panels, communication equipment, batteries and other components can deteriorate or develop faults.
The NSI recommends routine servicing by appropriately approved companies to maintain system performance.
For FM teams, maintenance requirements should form part of the original specification.
This includes establishing inspection schedules, responsibility for repairs, fault reporting and documentation.
Linaker offers intruder alarm systems among the supplementary services delivered through its approved supply partners, alongside wider technical facilities management.
Thermatic Technical FM provides planned and reactive fire and security maintenance, including intruder detection, within its commercial building services.
These capabilities may be relevant where security equipment forms part of an existing hard FM maintenance arrangement.
Check Monitoring Resilience and Backup Power
Intruder alarms need to remain dependable when buildings are unoccupied.
Power failures, communications interruptions or equipment faults can affect the system’s ability to detect and report incidents.
FM teams should therefore assess backup power arrangements and the resilience of alarm signalling.
The appropriate requirements depend on the alarm grade, monitoring arrangements and building risk.
Buyers should establish how faults are identified and whether relevant personnel receive suitable notifications.
They should also consider how the system will operate during planned electrical work or wider building disruption.
A reliable security system needs to function when conditions are less than ideal.
Review Data Security and Access Permissions
Modern alarm systems may provide remote administration, mobile applications and event histories.
These capabilities can improve convenience and oversight but also require appropriate security controls.
FM teams should consider how users are authorised, how access is removed when employees leave and who can change system settings.
Where alarm systems connect to wider IT networks, relevant cybersecurity responsibilities should be established.
Security logs may also contain information about employee movements or building access.
Organisations should therefore ensure that information is handled appropriately and access is restricted to authorised personnel.
The objective is to improve physical security without introducing avoidable digital or privacy risks.
Calculate Whole-Life Cost
Intruder alarm quotations can vary considerably depending on building size, system grade, monitoring and installation requirements.
However, initial equipment and installation costs are only part of the financial picture.
Organisations may also need to budget for monitoring subscriptions, servicing, batteries, repairs, signalling and response arrangements.
Additional costs can arise when buildings are extended or internal layouts change.
FM teams should therefore compare whole-life costs rather than simply the lowest quotation.
A system that costs less to install may become expensive if it generates repeated faults or requires frequent corrective visits.
The most appropriate solution should provide the required level of protection at a sustainable long-term cost.
Questions to Ask Intruder Alarm Providers
Before selecting an intruder alarm solution, FM teams should consider:
- How has the building’s security risk been assessed?
- What alarm grade and standards are recommended?
- Are there specific insurer requirements?
- Is a wired, wireless or hybrid system most appropriate?
- How will vulnerable areas and entry points be protected?
- What measures will reduce unwanted activations?
- Is remote alarm monitoring available?
- Does the proposed system qualify for police response?
- Who is responsible for obtaining and maintaining any required URN?
- What keyholder and response arrangements are available?
- Can the alarm integrate with CCTV or access control?
- How are faults, power failures and communication problems reported?
- What servicing and maintenance arrangements are included?
- Can the solution be managed across several sites?
- What are the total installation and ongoing operating costs?
Frequently Asked Questions
What is a commercial intruder alarm system?
A commercial intruder alarm system uses detectors, control equipment and warning or signalling devices to identify potential unauthorised access to business premises.
What is the difference between monitored and unmonitored alarms?
An unmonitored alarm generally sounds locally when activated. A monitored system sends signals to an alarm receiving centre or another designated monitoring service, enabling an agreed response process.
Do commercial intruder alarms automatically receive police response?
No. Police response is subject to applicable security systems policies, relevant standards, approved monitoring arrangements and other requirements. Attendance also depends on police operational priorities.
What is an intruder alarm grade?
Alarm grades describe different levels of system security and resistance to potential threats. The appropriate grade depends on the assessed risk, relevant standards and any insurer requirements.
How often should commercial intruder alarms be serviced?
Servicing frequency depends on the system, applicable standards, monitoring requirements and maintenance contract. Buyers should confirm the appropriate schedule with a competent provider.
Can intruder alarms integrate with CCTV and access control?
Yes. Suitable systems may support integrations that improve incident verification and coordination, although compatibility and operational requirements need to be established during specification.
Product & Services Guide
The Facilities Management Forum brings together senior FM, estates and property decision-makers with relevant solution providers through pre-arranged one-to-one meetings, offering an opportunity to explore intruder alarm systems, electronic security, building maintenance and wider facilities management solutions. Among the attending suppliers are:-
Adept Fire & Security Ltd
Commercial fire and electronic security specialist offering intruder alarm systems, CCTV, access control and associated installation and maintenance services. Its intruder alarm offering includes hard-wired and wireless options for different property requirements.
Website: https://adeptfiresecurity.co.uk/
BAM UK & Ireland
Construction and integrated facilities management provider delivering services across public and commercial buildings. Its FM offering includes security management alongside maintenance, building performance and other property services, making it relevant to organisations seeking coordinated facilities and security support.
Website: https://www.bam.co.uk/
COAT Facilities Group
Facilities management group offering fire and security services, including intruder alarms, CCTV, access control, alarm monitoring, maintenance and emergency response. Its wider services include planned maintenance, compliance and integrated FM support.
Website: https://coatfacilitiesgroup.com/
Edmundson Electrical Ltd
Electrical wholesale supplier providing access to fire and security products, including intruder alarm equipment, CCTV and access control. Its services support electrical contractors, installers and project teams sourcing equipment for commercial security installations.
Website: https://www.edmundson-electrical.co.uk/
Linaker Ltd
Technical facilities management provider offering planned and reactive building maintenance. Its supplementary services include intruder alarm systems, delivered through approved supply partners alongside related security and building services.
Website: https://linaker.com/
Thermatic Technical FM
Technical facilities management specialist providing mechanical, electrical and building maintenance services across commercial premises. Its fire and security maintenance capabilities include intruder detection, access control and related systems.
Website: https://thermatictechnical.co.uk/
Protect the Building, Not Just the Boundary
A commercial intruder alarm system should provide more than a warning that somebody may have entered a building.
It should form part of a reliable security process that identifies genuine threats, supports an appropriate response and continues operating effectively over time.
A useful buying framework is: assess → detect → verify → respond → maintain
Assess the risks associated with the building.
Select appropriate detection technology and coverage.
Verify potential incidents through suitable monitoring arrangements.
Ensure that the right response follows.
Then maintain the system so it remains dependable.
The most effective intruder alarm isn’t necessarily the one with the loudest sounder or the greatest number of detectors.
It’s the one that helps the organisation recognise a genuine threat and act before it becomes a more serious incident.
The Facilities Management Forum brings together senior FM, estates and property decision-makers with relevant solution providers through pre-arranged one-to-one meetings, offering an opportunity to explore intruder alarm systems, electronic security, building maintenance and wider facilities management solutions.
Related Reading
This is the first article in our November Intruder Alarm Systems series.
It provides a buyer’s guide to commercial alarm systems, covering risk assessment, detection technologies, monitoring, police response, integration, maintenance and whole-life cost.
The next article will examine how FM teams can reduce false alarms, improve monitoring arrangements and maintain reliable intruder detection across their property portfolios.
Sources
- ProtectUK – Physical Security
- ProtectUK – Alarms and CCTV
- National Security Inspectorate – Intruder Alarm Systems for Business
- National Security Inspectorate – Insurance and Security Standards
- Police.uk – Preventing Burglary
- Adept Fire & Security
- BAM UK & Ireland – Facilities Management
- COAT Facilities Group – Services
- Edmundson Electrical
- Linaker – Services
- Thermatic Technical FM
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