Understanding UK Fire Alarm Standards: BS 5839-1:2025 & BS 5839-6 Explained
For any business or property owner, fire safety is not optional — it’s a legal responsibility. In the UK, the primary fire alarm standards that guide system design, installation, and maintenance are BS 5839-1:2025 for non-domestic buildings and BS 5839-6:2019+A1:2020 for domestic premises.
This guide breaks down what they mean and why compliance is essential.
What Is BS 5839-1:2025?
This standard governs fire alarm and detection systems in commercial and public buildings such as offices, schools, shops, warehouses and industrial sites.
The 2025 update focuses on:
Improved definitions for “life protection” (L1–L5) and “property protection” (P1–P2) systems
Stronger requirements for competent designers and installers
Better wiring and cable identification standards
Enhanced rules for detector siting, sounders, and visual alarms
Updated testing & maintenance guidance
These adjustments help reduce false alarms and improve detection speed — both essential for saving lives and protecting property.
What Is BS 5839-6?
BS 5839-6 covers domestic properties, including:
Houses
Flats and apartments
HMOs
Sheltered housing
Mixed-use buildings with residential units
This standard defines:
Grades (A–F2): the type of alarm system used
Categories (LD1, LD2, LD3): how much of the property requires detection
For example, most modern homes require at least Grade D2, LD3, whereas HMOs typically require higher-grade systems for increased safety.
Why These Standards Matter
Following BS 5839 standards:
Ensures your premises meet the Regulatory Reform (Fire Safety) Order 2005
Supports legal compliance
Improves early detection & evacuation
Reduces false alarm risk
Helps insurance compliance
How AK Fire Safety Can Help
We design, install, commission and maintain fire alarm systems fully compliant with BS 5839 standards.
Whether you need a new system, an upgrade, or regular servicing — we ensure your property stays safe, legal and protected.
