Dynamic Risk Assessment Template: Hazards That Change on Site
Your written risk assessment covers the hazards you could foresee before the job started. But sites change. The weather turns, you uncover something the survey missed, another trade leaves a hazard in your path, or the scope shifts halfway through. A dynamic risk assessment is how you deal with the risks that show up after the paperwork is signed.
This guide explains what a dynamic risk assessment is, when it's appropriate, and gives you a simple template structure for capturing on-the-spot decisions in a way that holds up.
What is a dynamic risk assessment?
A dynamic risk assessment (sometimes called a point-of-work risk assessment) is a continuous, on-the-spot evaluation of the risks in a changing situation. Instead of being written in advance, it happens in real time, on site, as conditions change.
It does not replace your written risk assessment. The two work together:
- Your written (standard) risk assessment covers the foreseeable hazards of the planned work — done in advance, recorded, submitted as part of your RAMS.
- Your dynamic risk assessment handles the hazards that emerge or change during the work — the ones you couldn't reasonably have predicted, or conditions that shift on the day.
The legal basis is the same as for your written assessment. Regulation 3 of the Management of Health and Safety at Work Regulations 1999 requires a "suitable and sufficient assessment of the risks". Regulation 3(3) requires that assessment to be reviewed when there is reason to suspect it's no longer valid, or when there's been a significant change. A dynamic risk assessment is, in effect, that review happening live — recognising a change and adjusting your controls before you carry on.
When do you need a dynamic risk assessment?
You're effectively doing one any time you stop and reassess because something changed. Common triggers on a construction site:
- Unexpected conditions. You lift a floorboard and find a service that wasn't on the drawings. You open a wall and find suspected asbestos.
- Changing weather. Wind picks up while you're working at height. Surfaces become icy or wet.
- Other trades. Someone leaves an unguarded edge, a trailing lead, or a spill in your work area.
- Scope creep. The client asks you to do "one more thing" that wasn't in your original assessment.
- Equipment problems. A tool fails, access equipment isn't what you expected, or a guardrail is missing.
In each case, the safe response is the same: stop, assess, decide, act — and if the change is significant, record it.
A dynamic risk assessment template
Dynamic risk assessments are quick by nature, so the template is deliberately lightweight. Capture these fields:
| Field | What goes here |
|---|---|
| Date / time / location | When and where the reassessment happened |
| What changed | The new or unexpected condition that triggered the reassessment |
| New hazard(s) | The specific risk the change introduced |
| Who is at risk | You, other operatives, other trades, public |
| Decision | Stop / continue with new controls / change method |
| New controls applied | What you actually did about it |
| Continued or stopped? | Whether work resumed and on what basis |
| Assessor + signature | Who made the call |
The point isn't to write an essay mid-job. It's to capture the decision so there's a record that you recognised the change and responded to it — not just carried on regardless.
The on-site decision sequence
A simple, memorable process for the moment a hazard changes:
- Stop. The instinct to push on is exactly what gets people hurt. Pause the task.
- Assess. What's the new hazard? Who could it harm? How badly?
- Decide. Can you continue safely with new controls? Do you need to change your method? Or do you need to stop entirely and escalate?
- Act. Put the controls in place, change the approach, or down tools and report it.
- Record (if significant). Note what changed and what you did, especially for anything that could have caused serious harm.
For routine, low-consequence changes you reassess constantly without writing anything down — that's normal and proportionate. The recording matters most when the change introduced a serious hazard, when you had to stop work, or when you significantly altered your method.
How it fits with your written RAMS
A dynamic risk assessment doesn't override your written documents — it sits alongside them and, where the change is significant, should feed back into them. If you keep encountering the same "unexpected" hazard, it isn't unexpected any more: it belongs in your standard written risk assessment for that type of work.
If you're not confident your written assessment is solid in the first place, start there. Our construction risk assessment template guide covers what a suitable and sufficient written assessment must contain, and how to write a risk assessment that passes HSE inspection covers what inspectors look for. The dynamic assessment is the live layer on top of a sound written foundation — not a substitute for it.
Frequently asked questions
Is a dynamic risk assessment a legal requirement?
There's no provision in UK law specifically named "dynamic risk assessment". The legal duty is to carry out a suitable and sufficient risk assessment and to review it when conditions change (Regulation 3 of the Management of Health and Safety at Work Regulations 1999). A dynamic risk assessment is the practical way you meet the review duty in real time when something on site changes — it's a recognised method, not a separate legal obligation.
Does a dynamic risk assessment replace my written risk assessment?
No. Your written risk assessment covers the foreseeable hazards and must be done in advance — principal contractors require it as part of your RAMS. A dynamic risk assessment handles only the changes that arise during the work. Relying on dynamic assessment alone, with no written assessment, would not meet your legal duties.
Do I have to write down every dynamic risk assessment?
Not every one. For minor, routine adjustments you reassess continuously without recording it, which is proportionate. You should record a dynamic risk assessment when the change introduced a significant hazard, when it caused you to stop work, or when you materially changed your method — so there's evidence you recognised and managed the change.
What's the difference between a dynamic risk assessment and a point-of-work risk assessment (POWRA)?
They describe the same idea: assessing risk at the actual point and moment of work rather than only in advance. "POWRA" is a more formalised version some larger contractors use with a standard form; "dynamic risk assessment" is the broader term for continuous on-site reassessment. Both sit alongside, not instead of, your written risk assessment.
The bottom line
Sites don't behave the way the survey said they would. A dynamic risk assessment is how you stay safe and compliant when conditions change after the paperwork is done: stop, assess, decide, act, and record anything serious. It's the live counterpart to a solid written RAMS — and the two together are what genuinely keep a site safe.
If producing the written side for every job is the bottleneck, TradeRAMS generates site-specific risk assessments and method statements from guided questions about your actual work. Join the waitlist for early access.