The short answer
There is no general law on alarm maintenance, but where your policy has an alarm condition, keeping the system maintained is what keeps it valid. In practice an insurer expects the alarm to be kept in full working order under a maintenance contract with an approved company, serviced at the recommended intervals, with faults repaired promptly. Service frequency depends on the system: bells-only alarms are typically serviced once a year, while monitored (police-response) systems usually require twice-yearly servicing under the relevant standards. If servicing lapses and the alarm is not maintained at the time of a burglary, the insurer may treat the alarm condition as breached and reduce or refuse the theft claim. The requirement is set by the policy, not by statute.
Maintenance is the quiet condition that decides whether an alarm still counts at claim time. It is rarely a legal duty in itself, but it is frequently a policy one.
Keeping an alarm valid for cover
- Legal duty to maintain?No general statute
- Policy dutyOften, via alarm condition
- Bells-only servicingTypically once a year
- Monitored / police-responseUsually twice a year
- If servicing lapsesClaim may be at risk
Maintenance is a policy condition, not a statute
There is no UK law that says a homeowner must service a burglar alarm. The obligation, where it exists, comes from the insurance policy. When an insurer gives credit for an alarm or makes one a condition of cover, it almost always requires the system to be kept in efficient working order and maintained. That requirement usually points to a maintenance contract with an NSI- or SSAIB-approved company.
The reason is practical. An alarm is only a real risk control if it actually works, and electronic security systems degrade over time — backup batteries fail, sensors drift, contacts wear. A maintenance contract ensures these are checked and corrected, so the insurer can rely on the alarm being operational rather than nominally present. A system left unserviced for years is, from the insurer's point of view, an unknown quantity.
What 'maintained' actually involves
For an insurer, a maintained alarm typically means all of the following are in place:
- a live maintenance contract with an approved alarm company;
- periodic servicing at the recommended frequency for the system type;
- prompt repair of faults, so the alarm is not left out of action;
- retained service records showing the visits and any work done.
Service frequency follows the type of system and the standards it is installed to. As a general rule, an audible-only (bells-only) alarm is serviced about once a year, while a monitored system, particularly one with police response, is usually serviced twice a year because the response element depends on reliability. Some modern systems with remote diagnostics can substitute a remote check for one physical visit, but the principle of regular, documented maintenance remains.
| System type | Typical service interval | Why |
|---|---|---|
| Bells-only (audible) | Annual | Keeps deterrent reliable |
| Monitored — keyholder/ARC | Often twice yearly | Response depends on reliability |
| Monitored — police response | Twice yearly | Required to maintain URN / response |
Indicative service frequencies under common UK alarm standards. Your installer and policy set the exact requirement.
What happens to cover if maintenance lapses
If your policy carries an alarm condition and the system was not maintained at the time of a burglary — the contract lapsed, a known fault was left unrepaired, or servicing was years overdue — the insurer may argue the condition was breached and seek to reduce or decline the theft claim. As with any alarm condition, insurance law means the insurer should generally only rely on the breach where it was relevant to the loss, but an unmaintained, possibly non-working alarm is exactly the kind of breach an insurer will scrutinise after a theft.
There is also a knock-on effect for monitored systems: police response under the URN policy depends on the alarm being maintained and reliable, and persistent false alarms can lead to response being withdrawn. Losing police response can itself put a high-risk policy's conditions in jeopardy. So lapsed maintenance can undermine both the insurance condition and the level of response you are paying for.
Staying compliant in practice
The simplest way to keep an alarm insurance-valid is to hold a maintenance contract with an approved company and let them service it on schedule. Diarise the service visits, deal with any faults promptly rather than leaving the alarm part-working, and keep the service reports and contract with your insurance documents. If you switch insurer, re-check whether the new policy has an alarm condition and what maintenance it expects, since this can differ.
If you are ever unsure what your policy requires, read the alarm condition in the policy wording and ask the insurer to confirm the maintenance standard. Because the requirement is contractual and varies between insurers — and because alarm standards are updated over time — the authoritative answer for your situation is the one your insurer and approved installer give, not a general figure. Treating maintenance as a continuing obligation, rather than a one-off at installation, is what keeps both the alarm and the claim protection alive.
A few practical habits make this far easier to sustain. Set a reminder for the renewal of the maintenance contract as well as the insurance policy, since the two can fall due at different times and a lapsed maintenance contract is easy to miss. When a service visit happens, check that the engineer has left a dated report and that any faults found were actually fixed, not just noted. And if you receive a low-battery or fault warning on the panel, treat it as a time-sensitive job rather than background noise: a known fault left unattended is precisely the kind of thing an insurer will point to if it argues the alarm was not in working order at the time of a loss. The cost of a service call is small set against a theft claim that is reduced or refused because the system was not kept up.
Frequently asked questions
Is there a law requiring me to service my burglar alarm?
No general statute requires it. The obligation comes from your insurance policy. Where a policy has an alarm condition, it typically requires the system to be kept in working order and maintained, usually under a contract with an approved company.
How often should the alarm be serviced?
It depends on the system. Bells-only alarms are typically serviced annually, while monitored systems — especially those with police response — are usually serviced twice a year under the relevant standards. Your installer and policy set the exact requirement.
What if my maintenance contract has lapsed when I'm burgled?
If your policy has an alarm condition, an unmaintained alarm may be treated as a breach, and the theft claim can be reduced or refused. Keeping the contract live and retaining service records is how you show the condition was met.
Sources & further reading
- National Security Inspectorate (NSI) — intruder alarm maintenance
- Secured by Design — intruder alarm guidance
- Association of British Insurers (ABI) — home insurance guidance
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property and system. They are guidance, not a quotation.