A dynamic risk assessment is the live check you make while you work, when conditions change faster than a written assessment can. You look at what has changed, decide who could be harmed, weigh the benefit of carrying on against the risk, then carry on, add controls, get help or stop. Report what you found so the written assessment can be reviewed.
A dynamic risk assessment is the risk assessment you carry out in your head, on the spot, while a task is under way and the situation is changing. At Lift College we teach the written method, the HSE's five steps, in Risk Assessment Training, and the on the spot method in Lone Working Training, where module 3 covers dynamic risk assessment, check in and buddy systems and when a task should not be done alone. This guide explains what a dynamic risk assessment is, how it differs from a written one, the steps to follow and where the law fits.
Dynamic risk assessment meaning
The term comes from the fire and rescue service. The National Fire Chiefs Council describes dynamic risk assessment as the assessment of risk in a rapidly changing environment, where decisions are sometimes made in fast moving situations with incomplete or inaccurate information. Its outcome tells the incident commander whether crews should be working in the hazard area at all.
The same idea applies to anyone whose work changes in front of them and who cannot stop to rewrite a form: care and health workers on home visits, engineers, delivery drivers, security staff and cleaners, the lone workers the HSE lists in its guidance. A written risk assessment plans for the hazards you can foresee. A dynamic risk assessment deals with the ones that turn up on the day.
Dynamic risk assessment vs written risk assessment
The two work together. Your employer's written assessment sets the plan and the controls. Your dynamic assessment checks, minute by minute, whether that plan still fits what is in front of you.
Swipe to compare →Scroll sideways to compare →
| Feature | Written risk assessment | Dynamic risk assessment |
|---|---|---|
| When | Before the work starts, and reviewed when it may no longer be valid or there has been a significant change | During the work, continuously, as the situation changes |
| Who does it | The employer, or a competent person appointed to help | The person doing the task, or the person in charge at the scene |
| Information | Planned, with time to look at records, talk to workers and check guidance | Whatever you can see and hear at the time, often incomplete |
| Recorded | Significant findings must be recorded where there are 5 or more employees | Usually not written at the time; report what you found afterwards |
| Legal basis | Regulation 3 of the Management of Health and Safety at Work Regulations 1999 | Part of following your employer's procedures and training; it does not replace the written assessment |
| Outcome | Controls, procedures and training for the task | Carry on, add or change controls, get help, or stop and leave |
In the fire service a third type follows: an analytical risk assessment, which the National Fire Chiefs Council says should be formally recorded as soon as time or resources permit once an incident becomes more complex.
How to carry out a dynamic risk assessment in 5 steps
These steps follow the elements the National Fire Chiefs Council sets out for dynamic risk assessment and the HSE's steps for managing risk, put in the order you use them on a job.
- Stop and look at what has changed. Compare what is in front of you with what the written assessment planned for: new people, a different room, the weather, equipment, someone's mood or behaviour.
- Decide who could be harmed and how. You, colleagues, the person you are visiting and members of the public.
- Weigh the benefit against the risk. Is what you would gain by carrying on worth the risk now in front of you? If not, the answer is already no.
- Choose how to work. Carry on as planned, add or change a control (wait for a colleague, move to a safer spot, use different equipment), call for advice through your check in system, or stop and leave.
- Keep checking, then report. Repeat the check every time something changes. Afterwards, report what you found and any near miss, so your employer can review the written assessment. The HSE says problems spotted by workers, accidents and near misses are reasons to consider a review.
Examples of a dynamic risk assessment
- A care worker on a home visit. A visitor at the house has been drinking and is shouting. The HSE names people affected by alcohol or drugs as a key risk of violence for lone workers. The care worker decides whether to calm the situation, rearrange the visit, or leave and call it in.
- An engineer on another employer's site. The job turns out to need entry into a tank. The HSE says work in a confined space requires at least one other person, so the engineer stops rather than carrying on alone.
- A delivery driver. Ice on the drop off route makes the planned parking spot unsafe. The driver chooses another place to stop and carries the load a shorter, safer way.
- A fire crew at an incident. The incident commander's dynamic risk assessment decides whether crews should be operating in the hazard area, which sets the tactical mode.
Who needs to do dynamic risk assessments, and what the law says
Every employer must make a suitable and sufficient assessment of the risks to employees and others under regulation 3 of the Management of Health and Safety at Work Regulations 1999, review it when it may no longer be valid or there has been a significant change, and record the significant findings if there are 5 or more employees. A dynamic risk assessment is how the people doing the work keep that plan safe on the day.
The HSE's lone working guidance says employers must train, supervise and monitor lone workers, keep in touch with them and respond to any incident. It says training is particularly important where there is limited supervision and to help people cope with unexpected situations, and that workers should be able to recognise when they should get advice. Employers should also set limits on what can be done alone. A dynamic risk assessment works inside those limits: it can tell you to stop, but it cannot make a task safe to do alone when the HSE says it needs another person.
Learn dynamic risk assessment online
Lone Working Training is 1 hour of learning in 4 short modules and teaches you to carry out a dynamic risk assessment before and during a task or visit, alongside check in and buddy systems, personal safety and emergencies. Risk Assessment Training is 2 hours in 5 short modules on the written method: hazards and who might be harmed, rating likelihood and severity, the hierarchy of control, recording and reviewing. Both give you a CPD certificate issued by Lift College the same day you pass, with a recommended refresh every 3 years and a free refresher.
Compare providers in our guides to risk assessment training online and lone working training online. If your dynamic risk assessments often involve angry or distressed people, add Conflict Resolution and De-escalation Training, or see every course on the health and safety courses page.
Your next step
View the Risk Assessment Training course
£19.99, pay once
Frequently asked questions
What is a dynamic risk assessment?
What is the difference between a dynamic and a written risk assessment?
Do you have to write down a dynamic risk assessment?
Who carries out a dynamic risk assessment?
What are the steps of a dynamic risk assessment?
Where can I learn dynamic risk assessment online?
Sources checked
- National Fire Chiefs Council, Risk assessment at an incident (checked 27 October 2026)
- HSE, Lone working: protect those working alone (checked 27 October 2026)
- HSE, Risk assessment: steps needed to manage risk (checked 27 October 2026)
- Management of Health and Safety at Work Regulations 1999, regulation 3 (checked 27 October 2026)