In the UK, first aid requirements are based on risk rather than fixed rules. This means workplaces and environments are not treated equally, and first aid provision should increase as risk increases.
However, many employers and responsible persons are unsure how to define “low”, “medium” or “high” risk, and what those labels mean in practical terms.
This guide explains first aid risk levels clearly, using UK legal principles and HSE guidance, to help organisations understand how risk affects first aid provision.
Risk level refers to the likelihood and severity of injury or illness occurring in a particular environment.
UK law does not formally define low, medium or high risk workplaces. Instead, these terms are commonly used in guidance and best practice to describe how hazards and activities influence first aid needs.
Risk level is determined through a risk assessment. If you need a structured approach, see Workplace First Aid Risk Assessment (UK).
Low-risk environments are places where activities are unlikely to cause serious injury.
Typical examples include:
In low-risk environments, first aid provision usually focuses on minor injuries such as cuts, grazes, minor burns or feeling unwell.
Provision should still be accessible, maintained and reviewed. Low risk does not mean no risk. For smaller organisations, see First Aid Requirements for Small Business (UK).
Medium-risk environments involve activities where injuries are more likely, or where multiple types of risk are present.
Examples include:
These environments often involve:
First aid provision at this level may require more than one kit, clearer signage, or trained first aiders depending on the specific risks present.
Sector-based examples are covered in Restaurant, Café & Takeaway First Aid Requirements and School First Aid Kits (UK).
High-risk environments involve activities where serious injury is more likely.
Examples include:
In high-risk environments, first aid provision must be robust and closely aligned with the risks present. This often includes:
A practical example is explained in Construction Site First Aid Kits (UK).
| Risk level | Typical environments | First aid implications |
|---|---|---|
| Low | Offices, admin workplaces | Basic kits, clear access, regular checks |
| Medium | Schools, hospitality, warehouses | Multiple kits, wider coverage, clearer procedures |
| High | Construction, industrial sites | Trained first aiders, robust provision, frequent review |
As risk level increases, first aid arrangements usually need to change. This may affect:
This is why risk level links directly to decisions such as how many kits are needed. For further explanation, see How Many First Aid Kits Are Needed in a UK Workplace?.
Risk level is not fixed. It can change when:
This is why first aid provision should be reviewed regularly and after significant changes.
Understanding risk levels helps organisations apply proportionate and defensible first aid arrangements.
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