Standard explained
BS 5839 Overview: Fire Alarm Standard
BS 5839 is the UK code of practice for fire detection and alarm systems, covering design, installation, commissioning and maintenance in non-domestic premises.
BS 5839 is the British Standard code of practice for fire detection and fire alarm systems. Part 1 covers non-domestic premises — the design, installation, commissioning and maintenance of systems that detect fire and warn occupants.
What BS 5839 covers
- The category of system appropriate to the premises (see fire alarm categories).
- Design and installation requirements — detector coverage, sounder levels, call point locations.
- Commissioning and certification of new systems.
- Routine testing and maintenance — weekly user tests and periodic servicing.
Standard vs law
BS 5839 is a standard, not legislation. But meeting it is the recognised way to satisfy the duty under the Regulatory Reform (Fire Safety) Order 2005 to provide and maintain an appropriate means of detecting fire and warning people. A fire risk assessment determines what category and coverage are required.
Why it matters
Following BS 5839 ensures a system is not just installed, but designed for the building and kept working. For the routine that keeps it reliable, see weekly user tests and periodic servicing.
Related service
Fire Alarm Testing
Inspection and testing of fire detection and alarm systems in line with BS 5839 good practice.
Learn moreMore in this topic
Standard explained
Fire Detector Types Explained
Fire detector types include optical (smoke), heat, multi-sensor and aspirating detectors — each suited to different environments and fire risks under BS 5839.
Learn moreKnowledge article
Reducing Fire Alarm False Alarms
Reduce fire alarm false alarms by choosing suitable detectors, siting them well, maintaining the system, and managing activities like cooking, steam and dust.
Learn moreStandard explained
Fire Alarm Categories Explained
BS 5839 classifies fire alarm systems by category — M (manual), L (life protection) and P (property protection) — each with sub-categories for coverage.
Learn moreKnowledge article
Fire Alarm Testing Explained
Fire alarm testing confirms a fire detection and alarm system will detect fire and warn occupants — carried out and maintained to BS 5839.
Learn moreThis article provides general guidance and distinguishes legislation, British Standards and good practice. It is not legal advice. Always confirm the specific duties applying to your property and tenure.