How Many Security Guards Do You Need for an Event? UK Guide

There is no single ratio set in UK law. Most events plan somewhere between one steward per 100 attendees and one per 250, and the correct figure comes from your risk assessment, your premises licence conditions, and your local Safety Advisory Group.

As a starting point: low-risk indoor seated events sit at roughly 1 per 250 to 300. Outdoor events with alcohol, standing crowds and multiple zones move to around 1 per 100 to 150. Front-of-stage and high-density areas can go as tight as 1 per 75.

Below is how to work out your own number properly.

Is there a legal minimum number of security staff in the UK?

No. There is no statutory ratio in UK law that says X guards per Y people.

What does exist is a general duty of care under the Health and Safety at Work etc. Act 1974, plus whatever conditions attach to your event specifically. Those conditions are where the real numbers come from:

• Your premises licence or Temporary Event Notice. Licences frequently specify a minimum number of SIA Door Supervisors when alcohol is being sold. Treat that number as your floor, not your target.
• Your Safety Advisory Group. SAGs regularly set minimum stewarding numbers as a condition of approval, and their figure overrides any general industry ratio.
• Your risk assessment. This is the document that has to justify whatever number you land on.

The industry reference point is the Purple Guide, published by the Events Industry Forum, alongside the HSE’s event safety guidance.

Two things people get wrong with this table.

First, these are stewarding figures only. They do not include medical cover, traffic marshals, pit crew or specialist roles. Safety Advisory Groups push back hard on staffing plans that blend everything into one number.

Second, never round down. If your calculation gives 23, deploy 24.

Some do, some do not, and getting this wrong is a criminal offence.

Anyone carrying out security guarding or door supervision — searching, screening, dealing with conflict, refusing entry, removing people — must hold a valid SIA licence under the Private Security Industry Act 2001. The liability sits with you as the organiser, so always ask your provider to verify licences against the SIA public register before deployment.

Staff carrying out crowd management and customer service — directing people, answering questions, monitoring flow — do not need an SIA licence, but should hold a Level 2 Award in Spectator Safety or equivalent.

Most events run a blend of both. The split is decided by what each person will actually be doing on the day, not by job title. Our event stewards and SIA-licensed officers are deployed on exactly that basis.

A 600-capacity outdoor community festival in a park. One bar, three entry points, standing crowd, family audience, 6pm finish.

• General stewarding at 1 per 150: 4 stewards
• Entry and exit points: 2 per gate across three gates = 6
• Bar area, SIA-licensed: 2 officers
• Traffic and car park: 2 traffic marshals
• Supervisor: 1
• Break cover for a six-hour event: 2

That is around 17 staff, not the 4 you get from applying a ratio on its own. This is the gap that catches most first-time organisers out, and it is why the number should always come from a task-by-task breakdown rather than a single sum.

• Alcohol. The single biggest factor. It changes crowd behaviour and usually triggers licence conditions.
• Standing versus seated. Standing crowds need far more coverage. The Purple Guide references crowd density thresholds, and above four people per square metre you need active intervention.
• Site complexity. More entrances, more zones and more stages all mean more static posts.
• Audience profile. Age, expected behaviour and whether rival groups may be present.
• Duration. A six-hour event needs break cover. This is routinely forgotten at quoting stage.
• Time of day. Late finishes need more staff for dispersal.

Not directly, but it changes what you have to evidence.

Martyn’s Law is expected to commence in spring 2027. It will not tell you how many guards to hire, but it will require documented procedures for evacuation, invacuation, lockdown and communication — and those procedures need enough people on site to actually deliver them. An evacuation plan that assumes staff at exits only works if you have staffed those exits.

We cover the thresholds and duties in full in our guide to Martyn’s Law for UK event organisers.

1. Confirm your peak headcount, including staff. Our capacity calculations service handles this where the site is complex.
2. Check your licence conditions for any stated SIA minimum.
3. List every task, not just the headline ratio: gates, bar, stage, car park, patrols, supervision, breaks.
4. Apply the ratio to general stewarding only, then add the static and specialist roles on top.
5. Map positions with a stewarding dot plan so every person has a named position.
6. Document it in your event risk assessment and take it to your SAG.