There is no single fixed statutory minimum review interval written into the Fire Safety Order for every type of premises. The legal requirement is that the fire risk assessment must be reviewed regularly and reviewed again if there is reason to suspect it is no longer valid or if there has been a significant relevant change to the premises, the people in it, or the activities carried out there.
For many small and simple premises, an annual review is recognised as good practice. That is why many businesses and assessors work on a yearly review cycle. But that annual approach is a practical benchmark, not a universal legal rule for every building in every situation.
Last Updated: 2026
Reviewed By: London Safety Certificate Compliance Team
Key Takeaways
- Fire risk assessments should be reviewed at least annually to ensure ongoing safety and compliance.
- Reviews must occur more frequently if significant changes in building usage or structure happen.
- Immediate reassessment is necessary after any fire incidents or the discovery of new hazards.
- Different properties, like industrial or healthcare facilities, might require more frequent reviews based on risk levels.
- Compliance with local and international fire safety regulations often dictates the minimum frequency of reviews.
Table of Contents
Is There a Legal Minimum Review Frequency?
The safest legal answer is this: the law requires regular review, not a single one-size-fits-all interval. The Fire Safety Order does not say that every fire risk assessment must be reviewed every 12 months. It says the assessment must be kept up to date and reviewed when circumstances make that necessary.
That means the correct question is not only “how often should a fire risk assessment be reviewed?” but also “has anything changed that means the current assessment may no longer be valid?” If the answer is yes, the review should happen straight away rather than waiting for the next routine date.
How Often Should Fire Risk Assessments Be Reviewed?
For most premises, a sensible professional approach is:
| Premises / situation | Review approach |
|---|---|
| Small and simple premises | Annual review is generally recognised as good practice |
| Higher-risk or more complex premises | Review more frequently if the risk level justifies it |
| Any premises with significant change | Review immediately after the change |
| Any premises after a fire, near miss, or reason to doubt validity | Review immediately |
This structure reflects the legal position more accurately than a blanket annual statement. The assessment should be reviewed often enough to stay valid for the actual building and the actual risk. For the wider legal duty behind fire risk assessment, see what is the legal requirement for fire risk assessments.
When Should a Fire Risk Assessment Be Reviewed?
A fire risk assessment should be reviewed whenever there is reason to think it may no longer be valid or where there has been a significant relevant change. Common examples include:
- changes to the layout of the building
- changes in occupancy or the type of people using the premises
- changes to work activities or storage
- introduction of chemicals, dangerous substances, or higher fire load
- alterations to escape routes, fire doors, alarms, or other fire precautions
- a fire incident or near miss
- deterioration in fire safety measures
- major maintenance or building works
These are exactly the situations where an old assessment can stop reflecting the real fire risk on site.
Under What Circumstances Should the Fire Risk Assessment Be Reviewed?
The fire risk assessment should be reviewed under any circumstance that affects its accuracy or the suitability of the fire precautions in place.
That includes material alterations, changes to the way the premises is used, changes in management arrangements, changes in the people who may be at risk, and any event that suggests the previous assessment may now be out of date. A fire in the premises, even if limited, is an obvious trigger for review because it may reveal weaknesses in detection, escape, compartmentation, maintenance, or emergency procedures.
Does a Review Always Mean a Completely New Fire Risk Assessment?
No. A review does not always mean starting again from scratch.
A competent review may simply confirm that the previous action points have been completed, that no relevant changes have taken place, and that the existing precautions remain suitable. In other cases, a full new assessment may be needed because the building, the occupancy, or the fire risk profile has changed too much for a light-touch review to be enough. For the wider meaning and purpose of the assessment itself, see what is a fire risk assessment.
Fire Risk Assessment Frequency in Flats and Residential Buildings
For purpose-built blocks of flats, government-backed guidance is more detailed. It explains that the Fire Safety Order still requires regular review and review after relevant changes, but it also gives practical review examples. For a low-risk, modern, low-rise block, a review every two years may be sufficient, with a new fire risk assessment every four years. For higher-risk blocks or blocks over four storeys, an annual review may be more appropriate, with a new assessment every three years. In the highest-risk premises, an annual fire risk assessment may be appropriate.
That does not mean every building follows the same timetable. It means review frequency should be set by the level of risk, the likelihood of change, and the quality of management control in the building. For the different assessment scopes used in residential buildings, see fire risk assessment types.
How Long Does a Fire Risk Assessment Last?
A fire risk assessment does not have a fixed expiry date in the same way a certificate does. It remains valid only for as long as it still reflects the real conditions in the premises.
Once the building changes, the way it is used changes, the occupants change, or the fire precautions deteriorate, the assessment may no longer be reliable. That is why the better question is not “how long does it last?” but “is it still current and suitable?”
Fire Risk Assessment Review Frequency in Practice
In practice, responsible persons usually set a review routine and then bring reviews forward when circumstances demand it.
That means many organisations will adopt an annual review cycle, especially for ordinary workplaces, while also making sure the assessment is revisited sooner if anything important changes. A review schedule only works if it is combined with ongoing awareness of building changes, maintenance issues, staffing changes, incidents, and management failures that could affect fire safety.
Common Mistake: Treating Annual Review as the Only Rule
One of the most common mistakes is assuming that “review every year” is the full legal answer.
Annual review is a useful rule of thumb for many premises, but it is not the whole legal test. A building may need review sooner because of significant works, changed occupancy, a fire, a near miss, or new hazards. Equally, some residential buildings may follow different periodic review patterns if the risk profile and management arrangements justify it. The legal standard is to keep the assessment up to date, not to hide behind a calendar date.
Final Answer
If you are asking how often should fire risk assessments be reviewed minimum, the most accurate answer is this:
- the law requires the fire risk assessment to be reviewed regularly
- it must also be reviewed when there is reason to suspect it is no longer valid
- it must be reviewed after significant relevant change
- for many small and simple premises, annual review is recognised as good practice
- for some low-risk blocks of flats, review may be less frequent
- for higher-risk premises, more frequent review may be needed
So the right professional answer is not just “every year.” It is: review it regularly, review it when things change, and set the review frequency according to the actual level of risk. For the wider legal framework around fire safety duties, see fire safety regulations.
Frequently Asked Questions
How often should fire risk assessments be reviewed?
They should be reviewed regularly and sooner if there is reason to suspect the assessment is no longer valid or if a significant relevant change has taken place.
How often should a fire risk assessment be reviewed as a minimum?
There is no single fixed statutory review interval for all premises. For small and simple premises, an annual review is recognised as good practice, but the legal requirement is regular review and review after significant change.
When should a fire risk assessment be reviewed?
It should be reviewed when there are significant changes to the premises, the way it is used, the occupancy, the fire precautions, or after a fire or near miss.
Under what circumstances should the fire risk assessment be reviewed?
It should be reviewed if you suspect it is no longer valid, after material alterations, after major changes in use or occupancy, after fire incidents, or where fire safety arrangements have changed.
How long does a fire risk assessment last?
It has no fixed expiry date. It remains valid only while it accurately reflects the premises and the fire risk.
Does review always mean a completely new fire risk assessment?
No. Sometimes a review is a shorter check of actions, conditions, and changes. In other cases, a full new assessment is needed.