BS 5839 Fire Alarm Servicing — What Compliance Actually Looks Like
Most fire alarms in the UK are technically non-compliant with BS 5839 — not because the systems are broken, but because the paperwork is. Here is the real-world checklist.
Why BS 5839 matters
BS 5839-1 is the British Standard for fire detection and fire alarm systems in non-domestic premises. It is referenced directly by the Regulatory Reform (Fire Safety) Order 2005 and is the document an enforcing authority will hold up against your log book.
The 6-month rule
Section 45.4 of BS 5839-1 requires inspection and servicing at intervals not exceeding six months. In practice, this means two visits a year — typically split into one half-system test at each visit. Skipping a visit, or letting a date slip by a month, is one of the most common findings in fire safety enforcement reports.
What a competent servicing visit actually covers
A real BS 5839 service is not "test a few call points and leave a sticker". It is a structured inspection that includes:
- Battery load and standby calculations
- Cause-and-effect verification on at least 25 % of detection devices each visit
- Sounder level checks (65 dB(A) minimum in occupied areas, 75 dB(A) at the bedhead)
- Logbook review and false alarm rate calculation
- Confirmation of all changes since the last visit reflected in the zone chart
The logbook problem
Many premises have a fire alarm logbook that has not been touched in years. Under BS 5839-1 Section 46, the Responsible Person must record:
- Every weekly user test
- Every false alarm and its category (F1–F4)
- Every defect found and rectified
- Every contractor visit
Missing entries can render the entire system non-compliant, regardless of its physical condition.
False alarm reduction
The London Fire Brigade now stops attending repeat false alarm premises — under "Unwanted Fire Signal" policies. A false alarm rate above 1 per 100 detectors per year is a strong indicator that a system needs an L-category review or detector resiting.
How MetroFire does it differently
Every MetroFire visit produces a digital certificate, an updated asset register, a zone chart photograph, and a recommendation report. Everything lives on the MetroFire customer portal so your insurer, FRA assessor and enforcing authority can see it instantly.
Need a second opinion on your alarm contract? Book a free 30-minute review — we will tell you if your current provider is actually delivering BS 5839 compliance.
