How many first aiders do I need in a small office?

For a low-risk office with fewer than 25 employees, the HSE says you need at least one appointed person — someone responsible for first aid arrangements who can call emergency services. For 25–50 employees in a low-risk setting, you need at least one EFAW-trained first aider. Above 50 staff, you should have one trained first aider per 50–100 employees, depending on your specific risk assessment.

Do I need a first aider for night shifts and lone workers?

Yes. Your needs assessment must cover all shifts and working patterns, not just the main daytime workforce. If staff work evenings, nights, weekends, or in isolated roles, the HSE expects you to ensure first aid cover is available at all those times. In practice this means training multiple first aiders across shifts, not relying on a single certificate holder.

How often should I review how many first aiders I have?

The HSE recommends reviewing your needs assessment whenever anything significant changes: staff numbers increase or decrease, premises change, the nature of work changes, or following any serious workplace incident. As a minimum, review it every three years when first aid certificates come up for renewal.

How Many First Aiders Do I Need at Work?

Q: Is there a legal minimum number of first aiders?

There is no single fixed minimum written into law — the Health and Safety (First Aid) Regulations 1981 require employers to provide 'adequate and appropriate' first aid, which you determine via a needs assessment. The HSE provides guidance numbers by risk level and workforce size, but the legal obligation is to complete the needs assessment and act on it.

One of the most common questions employers ask us — and one of the most common HSE inspection findings — is inadequate first aid cover. The Health and Safety (First Aid) Regulations 1981 require every UK employer to provide "adequate and appropriate" equipment, facilities, and personnel for first aid. But they deliberately avoid specifying a fixed number — because the right number depends on your workplace. Here is how to work it out.

The HSE Needs Assessment: Your Starting Point

Before asking "how many", ask "what kind". The HSE requires you to carry out a first aid needs assessment that considers:

The nature and level of hazard in your workplace
The number of employees and how they are distributed across shifts, sites, and locations
The history of accidents and ill health at your premises
The nature of your work — is it desk-based, physical, or high-risk?
Remoteness from emergency services — if an ambulance would take 15 minutes to reach your site, your provision needs to be more robust
Employees with known medical conditions that require specific first aid responses
Young workers, trainees, and temporary staff who may carry higher risk

Once you have completed that assessment, the HSE's guidance numbers give you a useful benchmark. The table below sets out what most businesses in each category will need.

Low-Risk Workplaces: Offices, Retail, Light Commercial

A low-hazard environment is one where the main risks are slips, trips, and falls rather than machinery, chemicals, or heavy physical work. Offices, call centres, retail units, and professional services firms typically fall here.

Employees on site	Minimum provision	Training required
Fewer than 25	1 appointed person	No formal qualification required (but EFAW strongly recommended)
25–50	At least 1 trained first aider	EFAW (1-day, 6-hour course)
More than 50	1 first aider per 50–100 employees	EFAW as minimum; FAW for higher numbers

For an office of 8 people, technically an appointed person with a stocked first aid kit satisfies the regulation. In practice, most employers choose to have an EFAW-trained first aider because an appointed person cannot administer first aid — they can only call 999 and manage the situation until help arrives. See our breakdown of first aid requirements for offices for more detail on lower-risk workplaces.

Higher-Risk Workplaces: Construction, Manufacturing, Warehousing

Higher-hazard environments require more provision at lower staff numbers. The HSE's guidance for medium and high-risk workplaces:

Employees on site	Minimum provision	Training required
Fewer than 5	At least 1 appointed person; first aider recommended	EFAW strongly advised
5–50	At least 1 trained first aider	FAW (3-day) recommended; EFAW minimum
More than 50	1 first aider per 25–50 employees	FAW (3-day Level 3 qualification)

Construction is the clearest example: a site with 30 workers faces a significantly higher risk of serious trauma injuries than a 30-person office. The HSE expects a full First Aid at Work-qualified first aider on any construction site, regardless of the precise headcount. Read our detailed guide on first aid training for construction in Kent for construction-specific requirements.

Appointed Person vs Trained First Aider: Understanding the Difference

These are two distinct roles and the distinction matters:

An appointed person is not required to hold a first aid qualification. Their responsibilities are to take charge of an emergency situation, call for emergency services, maintain the first aid kit, and ensure first aid arrangements are in place. They cannot legally administer first aid — they are a logistics and coordination role.

A trained first aider holds an Ofqual-regulated qualification — either EFAW (Level 2, 1 day) or First Aid at Work (Level 3, 3 days) — and is competent to assess and treat injuries and medical emergencies until professional help arrives. All Skills 42U certificates are Ofqual-regulated, HSE-compliant, and valid for 3 years.

Shift Workers, Night Shifts, and Lone Workers

Your needs assessment must account for every working pattern — not just the main daytime shift. The HSE's guidance is explicit: if you have people working evenings, nights, weekends, or in isolation, you need first aid cover available at those times.

Practical implications for multi-shift businesses:

A single certificate holder working day shifts does not cover night shifts — you need trained first aiders on every shift pattern
Lone workers (delivery drivers, field service engineers, estate agents doing solo viewings) present a specific challenge. The HSE recommends they complete a first aid course themselves so they can self-administer basic care while waiting for emergency services
Remote sites far from emergency services should have a higher ratio of trained first aiders than the minimum guideline numbers

When you call us for a needs assessment, we will map your shift patterns and site locations alongside your headcount to give you a precise recommendation — not just the HSE minimum, but what's actually defensible if an HSE inspector visits. We cover businesses across Medway, Maidstone, and the rest of Kent and the South East.

Special Considerations: What Increases the Number You Need

Beyond headcount and risk level, several factors should push your first aider numbers above the base guideline:

Members of the public on site: Employers are not legally required to provide first aid to non-employees, but the HSE expects you to consider them. A busy retail site or visitor attraction with high public footfall warrants more first aiders than a private office with the same staff headcount.
Annual leave and sickness cover: If your single trained first aider goes on holiday, your business is technically uncovered. The HSE expects you to plan for this — either by training multiple first aiders or by ensuring your appointed person can escalate effectively.
Young workers and trainees: Higher-risk demographic requiring closer supervision and more responsive first aid cover.
Employees with known medical conditions: If a member of staff has a serious condition (epilepsy, severe allergy, diabetes), your needs assessment should explicitly address how first aid responders should react.
Multiple floors or buildings: Physical distance matters. If your business occupies three floors and an incident occurs on floor two, a first aider based permanently on the ground floor may not reach the casualty in time. Consider training a first aider on each floor.

How to Get a Free First Aid Needs Assessment

Skills 42U provides a free first aid needs assessment as part of every enquiry. Tell us your location, workforce size, shift patterns, and the nature of your work, and we will give you a clear recommendation: which qualification, how many people to train, and a fixed group price. There is no obligation and no hard sell. Call 07481 344486 or use the form below — we reply within 2 hours.

FAQs

Common questions about first aider numbers

For a low-risk office with fewer than 25 employees, the HSE says you need at least one appointed person. For 25–50 employees in a low-risk setting, you need at least one EFAW-trained first aider. Above 50 staff, you should have one trained first aider per 50–100 employees, depending on your specific risk assessment.

There is no single fixed minimum written into law. The Health and Safety (First Aid) Regulations 1981 require employers to provide 'adequate and appropriate' first aid, which you determine via a needs assessment. The HSE provides guidance numbers by risk level and workforce size, but the legal obligation is to complete the needs assessment and act on it.

An appointed person is not required to have first aid training. Their role is to call for help, maintain the first aid kit, and take charge when someone is injured. A trained first aider holds an HSE-compliant qualification (EFAW or FAW) and is competent to administer first aid. Most employers with more than a handful of staff need at least one trained first aider.

Yes. Your needs assessment must cover all shifts and working patterns. If staff work evenings, nights, weekends, or in isolated roles, the HSE expects first aid cover to be available at all those times. In practice this means training multiple first aiders across shifts, not relying on a single certificate holder.

The HSE recommends reviewing your needs assessment whenever anything significant changes: staff numbers, premises, the nature of work, or following any serious workplace incident. As a minimum, review it every three years when first aid certificates come up for renewal.

How Many First Aiders Do I Need at Work? The HSE Answer for UK Employers