BS 5839-1:2025 — Fire Alarm Servicing Requirements

What Is BS 5839-1?

BS 5839-1 is the British Standard for fire detection and fire alarm systems in buildings. It covers the design, installation, commissioning, and maintenance of fire alarm systems used in non-domestic buildings — which in practice means the vast majority of commercial, industrial, and managed residential premises.

The standard is published by the British Standards Institution (BSI) and is updated periodically. The current edition, published in 2025, sets out the recommendations that commercial building operators and their fire alarm contractors should follow to keep fire alarm systems in a compliant and reliable condition.

While BS 5839-1 is a standard rather than a piece of legislation, it represents the benchmark of competent practice in the industry. Where a building owner does not follow the recommendations of BS 5839-1 and a fire occurs, it can be very difficult to demonstrate that appropriate fire safety duties were discharged.

Why BS 5839-1:2025 Matters to Commercial Premises

For anyone responsible for a commercial premises — whether as a building owner, commercial landlord, facilities manager, or managing agent — BS 5839-1 sets out what good fire alarm maintenance and servicing looks like. It is the reference document that competent fire alarm engineers work to, and it is the benchmark that fire safety inspectors and insurance assessors may apply when reviewing compliance.

Following the recommendations of BS 5839-1 is also a practical way of demonstrating that the duty holder has taken reasonable steps to fulfil their obligations under the Regulatory Reform (Fire Safety) Order 2005 — the primary legislation governing fire safety in commercial and non-domestic buildings.

Key Servicing Expectations Under BS 5839-1:2025

BS 5839-1 recommends that commercial fire alarm systems are subjected to periodic inspection and servicing by a competent person at regular intervals. Key servicing expectations include:

• Minimum two service visits per year — bi-annual servicing is the baseline recommendation for most commercial premises. Higher-risk or more complex buildings may require quarterly visits.
• Functional testing of devices — at each visit, a proportion of the system's detectors and call points should be tested to confirm they are operating correctly. Full device testing should be completed over a cycle of visits.
• Panel inspection — the control panel should be inspected and tested, including battery condition, fault history, and correct operation.
• Documentation — every service visit should be recorded in the site log book and a written service report provided to the building owner or manager.
• Remedial works — any defects or items requiring attention should be clearly documented and communicated. Identified issues should not simply be noted and left — they require a remedial response.
• Review of system suitability — over time, buildings change. BS 5839-1 recommends that the system is periodically reviewed against the current use and layout of the building to ensure coverage remains appropriate.

What Businesses Should Do

If you are responsible for a commercial premises, the steps to take are straightforward:

1. Appoint a competent fire alarm contractor to carry out periodic servicing. Competence means genuine technical experience with commercial fire alarm systems — not just a general electrician who occasionally looks at fire alarms.
2. Ensure service visits happen at the correct frequency — at least twice a year for most commercial premises.
3. Keep your logbook up to date — the logbook should be held on site and updated at every visit, test, or fault event.
4. Act on remedial works identified during service visits. Defects that are recorded but not addressed do not fulfil the duty of maintenance.
5. Review your fire risk assessment regularly and ensure it reflects the current condition and coverage of your fire alarm system.