How Often Should a Fire Alarm Be Serviced in the UK?
BS 5839-1 sets the cadence: weekly user tests, six-monthly engineer services. Skipping any of these can render the system non-compliant — even if it physically works.
The headline answer
Under BS 5839-1, a non-domestic fire alarm system must be:
- Weekly — User test by the Responsible Person
- Six-monthly — Engineer inspection and service (intervals not exceeding 6 months)
- Annually — Full system test if not covered by combining the two 6-monthly visits
These are minimums. Higher-risk premises may need more frequent servicing.
The weekly user test
The Responsible Person (or competent delegated person) must:
1. Operate one different manual call point each week (rotating through all call points) 2. Verify the alarm sounds throughout the building 3. Verify the alarm is silenced and reset 4. Record the test in the logbook including the call point tested
Most Fire Authorities will ask for the logbook before doing anything else.
The six-monthly engineer service
A BS 5839-compliant engineer service covers approximately 50% of the system at each visit. Typically:
- Visit 1: panel checks, battery, all manual call points, 50% of detectors
- Visit 2: same panel checks, remaining 50% of detectors, full discharge test
Each visit should produce a written service report and a certificate.
The fully addressable nuance
For fully addressable systems with self-test functionality, BS 5839-1 allows extended service intervals with documented agreement. This is one of the more misunderstood provisions and should not be assumed without engineer confirmation.
What about domestic systems?
For domestic / residential single-dwelling systems (BS 5839-6), the cadence is different:
- Grade A systems — as per BS 5839-1
- Grade D systems (mains-powered standalone smoke alarms) — annual functional test, replacement at end-of-life (typically 10 years)
For common parts of blocks of flats, BS 5839-1 applies to the common-parts system.
What enforcement officers check
The first three things any inspecting officer checks:
1. Is the logbook current with weekly tests recorded? 2. Are the engineer service reports in date (within 6 months)? 3. Is there an in-date system certificate?
If any of these is missing or out of date, the system is treated as non-compliant.
MetroFire delivers BS 5839-1 servicing on six-monthly schedules with online certificates and logbook integration. Book a service.
