Can Security Guards Detain You? UK Law Explained

Seeing a security guard stop someone in a shop, venue, or private building can raise an obvious question: can they legally detain that person?

The short answer is that security guards do not have the same powers as the police. Their SIA licence does not give them a special power to arrest or detain members of the public. However, in limited circumstances, a security guard may be able to make a citizen’s arrest or use reasonable force to prevent crime, protect people or protect property.

This distinction matters. A guard cannot simply hold someone because they appear suspicious, refuse to answer questions or are accused of a minor issue. Any action taken must be lawful, necessary and proportionate to the situation.

For anyone working in the industry, understanding these limits is an important part of professional conduct. A well-trained Security Guard should focus on observation, clear communication, de-escalation, and prompt incident reporting. Learn more about the training and licence route in our Security Guard licence guide.

Do Security Guards Have the Power to Detain Someone?

Security guards do not have police powers. They cannot use their job title, uniform or SIA licence as a reason to detain somebody.

In England and Wales, a guard has the same limited power as any other member of the public to make a citizen’s arrest. This is sometimes called an arrest by “a person other than a constable”. It applies only in specific circumstances, usually where an indictable offence is taking place or where the person is reasonably suspected of having committed one.

Even then, the situation must meet strict conditions. Broadly, it must not be reasonably practicable for a police officer to make the arrest instead, and the arrest must be necessary to prevent the person from causing injury, suffering injury, damaging property or making off before the police can take responsibility.

That means a Security Guard should not treat a suspected incident as an automatic reason to physically hold somebody. The safest professional response is often to observe carefully, alert a supervisor or the police, preserve evidence, and keep everyone as safe as possible while help is arranged.

Legal accuracy note for the article: this guide should state that it primarily explains the law in England and Wales; Scotland and Northern Ireland have different legal frameworks. The core position is supported by section 24A of PACE, SIA training guidance and the Criminal Law Act’s reasonable-force provision.

When Can a Security Guard Make a Citizen’s Arrest?

A Security Guard may only consider a citizen’s arrest in England and Wales where the legal conditions are met. This is not a general authority to detain people, and it should never be treated as a routine response to suspected theft, anti-social behaviour or an argument.

The power is limited to indictable offences. In practical terms, the guard must have seen someone committing an indictable offence, or have reasonable grounds to believe that the person is committing or has committed one. The guard must also reasonably believe that an arrest is necessary.

For example, the arrest may need to prevent the person from:

• Causing physical injury to themselves or another person
• Suffering physical injury
• Causing loss of or damage to property
• Making off before a police officer can take responsibility for them

Another important condition is that it must not be reasonably practicable for a police officer to make the arrest instead. A Security Guard should therefore contact the police promptly and provide clear, factual information about what they have seen.

This is why security work requires sound judgement, calm communication and careful incident reporting. People who are considering a role in the industry can find out more in our guide on how to become a Security Guard in the UK.

Can Security Guards Use Reasonable Force?

A security guard may use force only when it is lawful, necessary and reasonable in the circumstances. Reasonable force is not a fixed action or technique. What may be reasonable in one situation could be excessive in another.

For example, a guard may need to protect themselves or another person from an immediate risk of harm. They may also need to prevent someone from causing damage or making off after a lawful citizen’s arrest. However, force must be proportionate to the actual threat. It should not be used to punish, intimidate or simply force someone to comply.

Good security practice means trying to prevent escalation before physical intervention becomes necessary. Guards should communicate clearly, create space where possible, call for support and contact the police when appropriate. Any incident involving force should be reported accurately, including what happened beforehand, why action was taken and who witnessed it.

A guard’s SIA training and employer procedures are important, but they do not give someone unlimited power to restrain another person. The legal test remains based on the facts of the specific situation.

The citizen’s arrest conditions above come from section 24A of the Police and Criminal Evidence Act 1984, while the reasonable-force principle is reflected in section 3 of the Criminal Law Act 1967.

What Security Guards Can and Cannot Do

A Security Guard’s role is to help protect people, premises and property. Depending on their employer and workplace, they may monitor entrances, carry out patrols, check visitor access, report incidents and support the safe running of a site.

They can also set reasonable entry conditions on behalf of a private business or venue. For example, a venue may require visitors to follow its rules, show identification or agree to a voluntary bag check as a condition of entering. A guard may refuse entry or ask someone to leave private premises where appropriate.

However, security staff cannot act as police officers. They do not have a general right to search people, demand personal information, issue criminal penalties or hold someone simply because they do not cooperate.

Can a Security Guard Search You?

In most situations, a security guard should ask for consent before searching you or your belongings. You can choose not to agree to a voluntary search. In response, the business or venue may refuse entry, ask you to leave or follow its own lawful procedures.

A guard should not use force simply because someone has refused. If there is a serious concern about a weapon, stolen property or an immediate threat, the appropriate response may be to preserve safety, seek support and contact the police.

The difference between a voluntary search, a lawful citizen’s arrest and an unlawful detention can be complex. For a clearer explanation of these boundaries, read our guide to security officer legal powers in the UK.

Can Security Guards Use Handcuffs?

Handcuffs are not a routine security tool and should never be used merely because someone is being difficult, argumentative or unwilling to leave. Consider their use only where there is a lawful reason to restrain someone and the force used is necessary and proportionate.

Where restraint is used, the person’s welfare must remain a priority. Monitor the incident, request assistance, and contact the police without delay where appropriate. Poor judgement or excessive force can cause harm and may lead to serious legal consequences.

Why Training and Professional Judgement Matter

Security work is not only about responding to incidents. It is about preventing them through communication, awareness and professional judgement. A capable guard knows when to speak calmly, when to create distance, when to call for assistance and when the police need to take over.

This is also why anyone entering the sector should understand the responsibilities that come with an SIA licence. If you are exploring this career path, our guide on whether a security officer can physically touch you provides further practical context around consent, safety and appropriate conduct.

The core legal position remains that security operatives have no special powers of arrest, and force must be reasonable in the circumstances.

What Should You Do If a Security Guard Stops You?

If a security guard asks you to stop, the safest response is usually to remain calm and avoid making the situation worse. Do not use force or try to push past staff, particularly where there is confusion about what has happened.

You can ask why you are being stopped and whether the police have been called. If you believe you are being treated unfairly, make a note of the time, location, names or identification details of staff and any witnesses, where it is safe to do so. You can raise a complaint with the business or security provider afterwards.

If the police arrive, cooperate with their lawful instructions. They have different statutory powers from private security staff and will assess the circumstances of the incident.

Key Points to Remember

• Security guards do not have special police powers because they hold an SIA licence.
• A citizen’s arrest is possible only in limited circumstances and must meet strict legal conditions.
• Any force used must be necessary, reasonable and proportionate.
• Guards should prioritise communication, de-escalation, safety and accurate reporting.
• Security staff cannot routinely force a search simply because somebody refuses consent.
• The law differs across the UK, so this article’s legal explanation is focused on England and Wales.

Security Guard Detention Questions Answered

Can a Security Guard stop you from leaving a shop?

A guard cannot simply prevent someone from leaving because they are suspicious. Any attempt to detain a person must be legally justified. Where a serious incident is suspected, staff should contact the police and follow lawful procedures.

Can a Security Guard take your property?

A guard may ask you to hand over an item or take reasonable steps to protect property in a lawful situation, but they do not have unrestricted powers to seize possessions. The circumstances, the reason for the action, and how it is handled all matter.

Can a Security Guard physically remove someone from private property?

A guard may ask someone to leave private premises and can support the lawful management of a venue or business. Physical intervention is not automatic. It must be necessary, reasonable and proportionate to the situation.

Do Security Guards need an SIA licence?

Most frontline security roles in the UK require the correct SIA licence. The licence type depends on the work being carried out, such as Security Guarding or Door Supervision. Read our Security Guard licence guide to understand the relevant route.

Train for a Professional Security Career

Good security professionals understand that their role is not to act like the police. Their role is to protect people and property responsibly, prevent incidents where possible, and respond with calm, professional judgement when issues arise.

If you are planning to work in site-based security, explore our SIA training courses and take the first step towards the right qualification and licence pathway.