Do I need security for my event?

“Do I need security for my event?” is one of the most common questions we’re asked — and the honest answer is: it depends on what kind of event you’re running. For some events, security is a legal or licensing requirement. For others, it’s strongly advised. And for a small, genuinely private gathering, it may be entirely optional.

This guide walks through when security is required, when it’s strongly advised, and when it’s optional, plus the SIA rules every organiser should understand. If you already know you need cover, our event security guards page explains how we staff events — or you can jump straight to get a quote.

When security is required

There’s no single UK law that says “every event must have security”. Instead, the requirement usually arrives through one of these routes:

Licensing conditions. If your event is held under a premises licence or a Temporary Event Notice, the licensing authority (or the police) can attach conditions — and a very common one is that SIA-licensed door supervisors must be present, often expressed as a ratio like one per 75 or 100 guests. If the condition is on your licence or TEN, security isn’t optional; running without it puts the licence and the event at risk.

Venue requirements. Many venues make SIA-licensed security a contractual condition of hire. The contract, not the law, is what binds you here — but it’s just as enforceable. Always check the small print before assuming you can skip it.

Insurer requirements. Event and public liability insurers frequently require licensed security as a condition of cover. If you don’t provide it and something goes wrong, your claim can be refused — which often costs far more than the guards would have.

Martyn’s Law direction of travel. The Terrorism (Protection of Premises) Act — known as Martyn’s Law — is shifting expectations for publicly accessible venues and larger events. It centres on preparedness, procedures and reducing harm rather than mandating guards for every event, but for qualifying premises the practical answer increasingly points towards trained, briefed security staff.

When security is strongly advised

Even where nothing strictly compels it, you have a duty of care to staff, guests and the public. A sensible risk assessment will often conclude that security is needed when:

• Alcohol is being served, especially at scale or late into the night.
• The event is ticketed or open to the public, so you can’t fully control who attends.
• Capacity is high or the space has pinch points, narrow exits or a single entrance.
• There’s cash handling, valuable equipment, or VIP/notable guests.
• The crowd profile is unpredictable — mixed groups, a public invite, or a history of trouble at similar events.

In these situations, “I didn’t have to” is a weak position if an incident occurs. Documented, professional security is both a safety measure and evidence that you took your responsibilities seriously.

When security is genuinely optional

For a small, private, unticketed gathering — a birthday at home, a family celebration, no entry charge and no alcohol sales — security is often optional. The risk is low and you control the guest list. Many hosts in this situation choose not to hire anyone, and that can be a perfectly reasonable decision.

That said, “optional” doesn’t mean “never worth it”. Even private hosts sometimes bring in discreet private party security for peace of mind, to manage a guest list, or to keep gatecrashers out of a milestone event.

The SIA rules — explained accurately

This part trips people up, so it’s worth being precise.

If someone carries out licensable security work for reward — door supervision, guarding, searching, access control at a public or licensed event — they must hold a valid SIA licence. Supplying or working as unlicensed security for reward is a criminal offence, with real penalties for both the worker and whoever engaged them. This is why a “cheap mate who’ll stand on the door for fifty quid” is a genuine legal risk, not a saving.

But there’s an important nuance. A private host using their own unpaid friends or family to, say, welcome guests at a truly private party is not the same as engaging paid security — the licensing regime is aimed at security supplied for reward in the regulated context. The lines around “for reward”, “in-house”, and what counts as licensable activity can be subtle, so if you’re in any doubt, the safe answer is to use properly licensed staff. Don’t try to engineer your way around the SIA regime; it’s there for a reason and the penalties are serious.

For stewarding-type roles (flow, welcome, car parking) that don’t involve licensable activity, an SIA licence may not be required — which is why a good plan often blends stewards with licensed officers.

A quick decision guide by event type

Private party at home — Usually optional if it’s small, unticketed and alcohol isn’t being sold. Consider discreet cover for guest-list control or large milestone events.

Wedding — Rarely legally required, but a small, discreet team is popular for managing uninvited guests, gifts and a smooth evening. Check whether your venue’s contract requires it.

Public or ticketed event — Frequently required via licence/TEN conditions, and almost always advisable. Selling tickets or charging entry sharply raises both risk and expectation.

Corporate event — Often advisable, sometimes required by the venue. Access control, ID checks and a calm, professional presence matter as much as crowd numbers here.

Festival or large outdoor event — Effectively always required. These run on a full staffing plan — gates, perimeters, search lines, welfare and overnight cover — built from a proper risk assessment.

Not sure how many officers your event needs? Our security guard calculator gives an instant, realistic starting point based on your guest count and risk profile.

Still not sure? Ask us

The genuinely tricky cases are usually about licence conditions, venue contracts and insurer requirements — and those are exactly the things we check for you. Tell us your event type, venue and expected numbers, and we’ll tell you straight whether security is required, advisable or optional, with no pressure to over-book.

When you’re ready, get a quote and we’ll send a clear, all-inclusive figure — and, just as importantly, an honest view on whether you need cover at all.