First Aiders on Site: The Needs Assessment Explained

Most manufacturing sites carry one first aider per shift. Ask the safety manager how they arrived at that number and the answer is usually the same: that’s what the previous safety manager did. No needs assessment, no documentation, just inherited practice that nobody has questioned since 2009.

That’s not a criticism. It’s a description of how most compliance gaps accumulate. The number might be right. It might not be. Under the Health and Safety (First-Aid) Regulations 1981, you’re required to work that out and write it down.

Why There Is No Fixed Ratio

The regulations don’t hand you a formula. They require employers to provide “adequate and appropriate” first aid cover, and they define that through a needs assessment. HSE guidance offers rough benchmarks, but they’re starting points. For higher-hazard workplaces, such as most manufacturing environments, one trained first aider per 50 employees is a common reference figure. For lower-hazard workplaces, one per 100.

Neither number applies automatically. A site with 48 employees but a night shift of three people, machinery capable of serious injury, and a twenty-minute ambulance response time needs to think harder than the ratio suggests.

What the Needs Assessment Covers

The HSE sets out what you need to weigh up. It is not complicated, but every element matters.

The nature of the work. Press shops, welding bays, chemical handling, and cutting operations all carry a different injury profile from a packaging line. Higher hazard means you err on the side of more cover.

Headcount. Total numbers across all shifts, not just the busiest one.

Shift patterns. This is where most sites underestimate. A night shift of fifteen people still needs first aid cover. One first aider for fifteen sounds generous until that first aider is the only one qualified to operate the crane and happens to be on a break.

Distance from emergency services. A site in a rural area with a twenty-minute ambulance response needs a higher level of in-house capability than a unit two minutes from a hospital.

Site layout. Multiple buildings, large floor areas, or restricted zones can all increase response time. A first aider in the office is not useful to someone who has collapsed at the far end of a warehouse.

Workers with known health conditions. If employees have declared conditions that could lead to a medical emergency, that factors in. You do not need a diagnosis, just an awareness.

Inexperienced workers. Agency staff, apprentices, and new starters carry a statistically higher accident rate. If a significant proportion of your workforce fits that description, build it into the assessment.

Cover, Not Just Headcount

The assessment is not really about total numbers. It is about reliable availability at every moment the site is running.

A site with four first aiders on a list looks fine. If two are on annual leave in August, one has a lapsed certificate, and the fourth is always off-site in client meetings, that site does not have first aid cover. It has paperwork.

You need to think about redundancy. How many first aiders can you afford to have absent before you drop below adequate cover? What is your plan for extended sickness? Who is tracking certificate renewal?

First aid at work certificates are valid for three years. If you are not actively managing expiry dates, someone will lapse without anyone noticing, until they are the only first aider on shift and you are looking for a second signature on the accident report.

Appointed Persons Are Not First Aiders

The regulations allow smaller, lower-risk workplaces to designate an appointed person rather than a trained first aider. An appointed person can call for help and manage the immediate situation. They are not trained to treat injuries.

For a manufacturing site with significant machinery or hazardous substances, an appointed person is not adequate cover. They are a fallback for environments where the risk of serious injury is genuinely low. Most manufacturing environments do not qualify.

Writing It Up

The needs assessment does not need to be a lengthy document. It needs to cover the factors above, record your conclusions, and be reviewed whenever anything material changes. A new process, a move to shift work, a significant change in headcount, a new site. Any of these should trigger a review.

An HSE inspector will want to see the assessment, not just the certificate on the wall. Writing it down also forces clarity. The exercise of listing shift patterns and calculating cover often reveals gaps that nobody had formally acknowledged.

If you are running a broader review of how your site is operating, the diagnostics section covers the pressure points that come up on manufacturing sites, including compliance gaps that sit quietly until they do not. And if workplace organisation is part of what you are addressing, the 5S walkthrough at 5s.cadencestandard.com is worth working through, partly because a well-run 5S programme tends to surface first aid station problems, such as blocked access, expired kit, and unclear signage, before an inspector does.