Monitored Alarm Systems UK: How 24/7 Monitoring Works, What It Costs and Why Insurers Care (2026 Guide)
If you are comparing monitored alarm systems UK providers, the key difference is simple: your alarm does more than sound locally. It sends a signal to a 24/7 Alarm Receiving Centre (ARC), where trained operators assess the event and follow an agreed response plan. That can mean contacting keyholders, requesting police attendance or escalating a fire alarm activation.
What is a monitored alarm system?
A monitored intruder alarm connects your property to an ARC using secure communications. When a detector, panic button or tamper device activates, the ARC receives the event and checks what has happened.
Monitoring is available for homes, offices, shops, warehouses and other commercial premises. It is particularly valuable when a property is empty, when an insurer requires professional monitoring or when you want expert support rather than relying solely on an app notification.
At SYNERGiT, we design smart, reliable security systems around your property, your risks and your preferred response arrangements.
How does alarm signalling work?
The alarm panel communicates with the ARC through one or more signalling paths:
IP signalling: sends alarm data over a broadband or internet connection.
GSM or 4G signalling: uses the mobile network and can provide an alternative to broadband.
Dual-path signalling: combines two independent routes, commonly IP and 4G, so one path can continue if the other fails.
Radio signalling: uses a dedicated radio network, where appropriate, to provide another resilient communication route.
PSTN or analogue signalling: older systems may use a traditional telephone line.
The UK’s legacy PSTN network is due to be withdrawn by 31 January 2027. If your alarm still relies on an analogue dialler, ask your alarm maintainer whether it needs upgrading to IP, mobile or dual-path signalling. The UK Government’s digital landline guidance explains why connected devices need to be reviewed.
How is monitored different from bells-only or app self-monitoring?
A bells-only alarm activates a siren or external bell at the property. It may deter an intruder, but no ARC operator receives the signal.
A self-monitored alarm sends an alert to your mobile app. You then decide what to do, contact keyholders or call the emergency services. This can be useful, but it relies on you being available, having a signal and being able to assess the situation.
A professionally monitored alarm sends events to an ARC at all times. Operators follow your agreed instructions, helping provide reassurance when you are asleep, travelling or unavailable.
What happens when a monitored alarm activates?
A typical incident is handled as follows:
A sensor, panic button or fire detector activates.
The alarm sends the event to the ARC.
The operator checks the signal, including whether there is a second detector activation or other confirmation.
The ARC contacts your nominated keyholders and follows the agreed escalation process.
Where the system, installer and ARC meet the relevant requirements, the ARC can request police or fire service attendance.
Keyholders attend where appropriate, help verify the situation and secure or reset the premises.
Police response is not automatic for every monitored alarm. For an intruder alarm, an active Unique Reference Number (URN) and compliance with the NPCC Security Systems Policy are important. Confirmed alarm arrangements help reduce false calls. Repeated false alarms can result in police response being withdrawn until the cause is corrected.
What are the keyholder and false-alarm responsibilities?
You must provide accurate keyholder details and ensure nominated keyholders can respond when required. They should know how to operate the system, attend safely and contact the ARC if access arrangements change.
Users also need to set and unset the alarm correctly, report faults promptly and avoid preventable activations caused by pets, visitors, building work or incorrect procedures. Regular servicing and user training make this hassle-free and help protect any police response arrangement.
What does a monitoring contract include?
Every contract is different, so check the detail carefully. A monitoring package may include:
24/7 ARC monitoring.
Keyholder call-out procedures.
Opening and closing signals, showing when the system is set or unset.
Engineer access or test mode, allowing planned work without unnecessary escalation.
Signalling-path fault alerts.
Scheduled service visits, or maintenance arranged under a separate agreement.
Support with police URN administration, where applicable.
Ask whether monitoring, maintenance, signalling, call-outs and equipment ownership are included in the monthly price.
How much do monitored alarm systems cost in the UK in 2026?
As a realistic starting point, a professionally installed monitored intruder alarm from SYNERGiT starts from £650 for a suitable smaller or straightforward property. Larger premises, additional detectors, dual-path signalling, panic devices and enhanced response arrangements will increase the price.
Monitoring subscriptions commonly range from approximately £15 to £40 per month, depending on the ARC service, signalling, police-response requirements and contract terms.
For context, professionally installed CCTV starts from £750. The final cost depends on camera numbers, recording, lighting, network requirements and installation complexity. We always recommend a survey before confirming a solution.
Why do insurers care about monitored alarms?
Insurers often ask for a compliant, professionally installed and maintained alarm, particularly for higher-value homes, businesses, stockrooms and premises left empty overnight.
Your policy may specify the required alarm grade, ARC connection, signalling type, maintenance frequency and police response arrangements. An installer approved by NSI or SSAIB can provide valuable assurance. NACOSS is also a recognised certification reference within the UK security sector.
Always check your policy wording before installation. Keep your certificate, commissioning documents and service records. Failure to set or maintain an alarm that is a policy condition could affect a claim.
What about monitored fire alarms for businesses?
For businesses, fire alarm monitoring can send an activation or fault signal to an ARC when the premises are unoccupied. Whether it is needed should be decided through the fire risk assessment and the building’s use.
Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must ensure fire safety systems are maintained in efficient working order, in an efficient state and in good repair. Routine testing, clear records and professional fire alarm maintenance by a competent person are essential. BS 5839 is widely used as the benchmark for design, installation, commissioning and maintenance.
Monitored alarm checklist
Before choosing a system, ask:
Is the ARC staffed 24/7?
Which signalling paths are used?
Is dual-path signalling suitable for the property?
Does the system still rely on PSTN or analogue technology?
Is police response required, and will a URN apply?
Who are the keyholders?
What happens after a false alarm?
Are opening/closing signals and engineer access included?
What exactly is included in the monitoring and maintenance fees?
Does the system meet your insurer’s written requirements?
At SYNERGiT, we make choosing a reliable home security system in the UK simple. Based in the East Midlands, we can arrange a free, no-obligation survey and give you a clear recommended solution for your home or business. Contact SYNERGiT through our website to discuss the expert security or fire alarm services you are interested in.
Written by Dan, Managing Director, SYNERGiT GROUP LIMITED.