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:
- Operate one different manual call point each week (rotating through all call points)
- Verify the alarm sounds throughout the building
- Verify the alarm is silenced and reset
- 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:
- Is the logbook current with weekly tests recorded?
- Are the engineer service reports in date (within 6 months)?
- 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If any of these is missing or out of date, the system is treated as non-compliant.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.
