Fire alarm risk assessment explained
How the fire risk assessment determines your fire alarm requirements, what the assessment must establish, and why the assessment must come before any decision about fire alarm specification.
The fire risk assessment is the foundation of every fire alarm decision. It determines the system category, the extent of detection coverage, and the type of equipment required. A fire alarm system installed without a fire risk assessment — or specified independently of one — may provide too little protection, too much, or simply the wrong kind. The assessment is not a formality that follows the fire alarm specification. It comes first.
Why the Fire Risk Assessment Is Required
The Regulatory Reform (Fire Safety) Order 2005 places a legal duty on the responsible person — typically the employer or building owner — to carry out a suitable and sufficient fire risk assessment and implement the precautions it identifies. This applies to virtually all non-domestic premises in England and Wales.
The assessment is not something done once and forgotten. It must be kept under review and updated whenever there is reason to believe it may no longer be valid — after building alterations, changes in occupancy, new processes, or following a fire or near-miss incident.
What the assessment determines for fire alarms
How the Assessment Drives the Fire Alarm Specification
The fire risk assessment answers the fundamental questions that define the fire alarm requirement:
| Question | How it determines the fire alarm specification |
|---|---|
| Who is at risk and how vulnerable are they? | Premises with sleeping occupants, vulnerable people, or complex evacuation requirements need higher-category systems — potentially L1 or L2 — to ensure adequate warning time. Low-risk premises with alert, mobile occupants may need only L3 or L4 |
| Where could a fire start? | Areas identified as high fire risk — kitchens, plant rooms, storage areas with combustible materials — may need detection under an L2 or P2 specification even if they are not on the primary escape route |
| Are there areas not continuously occupied? | Unoccupied areas — storerooms, plant rooms, roof voids — may require automatic detection to detect fire before it spreads to occupied areas. A Category M system is never appropriate where unoccupied areas exist |
| Is the building unoccupied for significant periods? | Out-of-hours fire risk drives the need for a P1 or P2 property protection system with ARC monitoring — so a fire is detected and responded to even when no one is in the building |
| What does the insurer require? | Insurance conditions frequently require a specific system category, typically P1 with ARC monitoring for premises with significant stock or equipment value. The assessment must consider insurer requirements alongside life safety requirements |
The five steps
The Five Steps of a Fire Risk Assessment
Identify fire hazards
Identify ignition sources (hot work, electrical equipment, smoking), fuel sources (combustible materials, storage, fixtures), and oxygen sources (ventilation, air conditioning). The assessment considers both the normal operating state of the premises and unusual conditions.
Identify people at risk
Identify all persons who use the premises — employees, visitors, contractors, and the public — and any people particularly at risk, including those with disabilities, those unfamiliar with the building, and those who may be sleeping on the premises.
Evaluate and reduce the risk
Assess the likelihood of fire occurring and the consequences if it does, taking account of existing controls. Identify where existing precautions are inadequate and what improvements are needed — including whether the current fire alarm system meets the required standard.
Record findings and implement improvements
Produce the written assessment record, including the action plan. Implement identified improvements in order of priority. For fire alarms, this means specifying the required system category and ensuring the installed system meets it.
Review and update
Keep the assessment under review. Update whenever significant changes occur. A formal review every one to three years is good practice even without significant changes.
When the assessment identifies a system upgrade
What Happens When the Assessment Identifies Inadequate Protection
A fire risk assessment may conclude that the existing fire alarm system does not meet the required standard — either because the category is too low for the occupancy and risk, because devices are of the wrong type for their environment, or because the system is too old to be reliably maintained.
Where the assessment identifies a system upgrade as necessary, the responsible person must act on that recommendation. Delaying or ignoring it creates legal exposure — a fire inspector who reviews the assessment and finds that the identified improvements have not been carried out will take enforcement action. The assessment is both a diagnostic tool and a compliance record: it documents what is required and creates an expectation that it will be done.
Common questions
Frequently Asked Questions
Yes — provided they have the relevant competence for fire risk assessment, which is distinct from competence in fire alarm installation and maintenance. Some fire alarm companies employ competent fire risk assessors, but this is not universal. Be cautious of a fire alarm company that carries out an assessment and then proposes to install a new system — there is an obvious commercial incentive to specify more than is strictly necessary. Where possible, commission the assessment from an independent assessor who is not also the potential installer.
Yes — the assessment determines the required category and the extent of coverage. Installing a system without an assessment means the system specification is not grounded in an analysis of the actual risk in the building. Even for a straightforward commercial premises, a brief assessment confirming the appropriate category and the required detector types should precede any system design or specification. Without it, neither the installer nor the building owner can be confident the installed system meets the legal requirement.