What Happens If a Security Guard Injures Someone?

Security guards occupy a unique and often difficult position. They are employed to protect people, property, and premises — yet the very nature of their work means physical confrontation is always a possibility. Whether managing an unruly customer at a nightclub door, detaining a shoplifter in a retail environment, or responding to an aggressive individual at a corporate site, security personnel may at times use physical force.

But what happens when that force results in injury? What are the legal consequences for the guard, the employer, and the business that hired them? And how does insurance factor into the outcome?

This guide explains exactly what happens when a security guard injures someone in the UK — covering criminal liability, civil claims, SIA licensing implications, and the critical role of specialist insurance.

The Legal Framework: Use of Force in the UK

Security guards in the UK do not have the same legal powers as police officers. They are, in most circumstances, ordinary citizens who happen to be employed in a protective role. This means their right to use force is governed by the same laws that apply to any member of the public — primarily the Criminal Law Act 1967 and the common law principle of self-defence.

Under UK law, a security guard may use reasonable force to:

• Defend themselves or another person from an imminent threat
• Prevent a crime from being committed
• Effect a lawful citizen's arrest under Section 24A of the Police and Criminal Evidence Act 1984
• Protect property from unlawful interference

The key word here is reasonable. The force used must be proportionate to the threat faced. A security guard who breaks a shoplifter's arm while detaining them for stealing a chocolate bar is unlikely to be regarded as having used reasonable force. Conversely, a guard who restrains a violent individual who is attacking a member of staff may well be acting within the law.

The assessment of reasonableness is not made with the benefit of hindsight. Courts consider what the guard genuinely believed to be necessary in the heat of the moment — but that belief must itself be reasonable. Training, context, and the specific circumstances of each incident all play a role in how courts evaluate these situations.

Criminal Liability for the Security Guard

If a security guard injures someone, they may face criminal charges depending on the severity of the injury and the circumstances surrounding it. Possible charges include:

Assault and Battery

Common assault or battery charges may apply where force was used unlawfully — for example, where a guard strikes a person without justification or uses excessive force during a restraint situation. Battery refers specifically to unlawful physical contact, while assault can cover threats or attempts to apply force.

Actual Bodily Harm (ABH)

Under the Offences Against the Person Act 1861, causing actual bodily harm — injury that is more than transient or trifling — can result in a charge of ABH. This might apply where a guard's physical intervention results in bruising, cuts, or minor fractures.

Grievous Bodily Harm (GBH)

Where an injury is particularly severe — broken bones, internal injuries, or permanent disfigurement — the guard may face a charge of GBH under Section 18 or Section 20 of the Offences Against the Person Act 1861. Section 18 carries a maximum life sentence where intent to cause serious harm is proven.

Manslaughter

In the most serious cases, where force results in death, a security guard could face a charge of unlawful act manslaughter or gross negligence manslaughter. There have been a number of high-profile cases in the UK involving the deaths of individuals following physical restraint by security or door staff.

It is worth noting that criminal proceedings and civil claims can run simultaneously. A guard may be prosecuted by the Crown and also face a civil compensation claim from the injured party or their family.

Civil Liability: Who Gets Sued?

Regardless of whether criminal proceedings are brought, an injured person has the right to bring a civil claim for compensation. This is where things become particularly complex for security businesses, employers, and their clients.

The Security Guard Personally

The individual security officer can be named as a defendant in a civil claim. However, in practice, claimants typically pursue employers and businesses rather than individual employees, simply because the financial recovery is greater.

The Security Company (Employer)

Under the principle of vicarious liability, an employer can be held legally responsible for the actions of their employees carried out in the course of employment. If a guard injures someone while performing their duties, the security company that employs them is likely to face legal liability — even if the company itself did nothing wrong.

Vicarious liability is well-established in UK law and has been extended in recent years by cases such as Various Claimants v Barclays Bank [2020]. For security firms, this means that the conduct of every guard on every shift is effectively a legal exposure for the business.

The Client Business

Where a security company has been contracted to provide personnel to a third party — a retail chain, venue operator, or construction site, for example — the client business may also face liability, particularly where:

• The client gave specific instructions that led to the injury
• The client had day-to-day control over the guard's activities
• There was a failure to provide safe systems of work on the client's premises

Courts have increasingly looked at the substance of working relationships rather than contractual labels when determining who bears responsibility. A security firm contracted to a supermarket, for instance, may find that the supermarket is deemed to share liability if their management directed the guard's actions.

SIA Licensing Consequences

Security guards working in most frontline roles in the UK are required to hold a valid licence issued by the Security Industry Authority (SIA). Criminal convictions, cautions, or findings of misconduct can have serious consequences for a guard's licence — and by extension, their career.

The SIA operates a licensing regime under the Private Security Industry Act 2001. Licence holders are expected to:

• Uphold the law at all times
• Use only lawful and proportionate force
• Comply with the SIA's Code of Conduct
• Report incidents appropriately

Where a guard is convicted of an assault-related offence, the SIA may revoke their licence, preventing them from working in the industry. Even where a conviction is avoided, a caution or a civil judgment against a guard may be considered by the SIA when assessing licence renewal.

For security businesses, employing unlicensed guards — or failing to ensure guards maintain their licences — is itself a criminal offence under the Private Security Industry Act.

What a Compensation Claim Looks Like

Civil claims arising from injuries caused by security guards typically proceed through the County Court or, for higher value claims, the High Court. The injured party — referred to as the claimant — must prove on the balance of probabilities that:

1. They were injured
2. The injury was caused by the security guard's conduct
3. That conduct was unlawful or negligent
4. The defendant (the security company and/or employer) is liable

Types of Damages Awarded

Where a claim succeeds, the court may award:

• General damages — compensation for pain, suffering, and loss of amenity
• Special damages — reimbursement of financial losses, including medical expenses, loss of earnings, and care costs
• Aggravated damages — awarded where the defendant's conduct was particularly high-handed or oppressive
• Exemplary damages — in rare cases, where the court wishes to punish the defendant's conduct

Claims arising from injuries caused by excessive force can be substantial. A serious injury resulting in long-term disability, ongoing medical treatment, or loss of livelihood can generate damages running into hundreds of thousands of pounds.

The Role of Insurance in Security Guard Injury Claims

This is where specialist security industry insurance becomes not just advisable, but essential. The financial consequences of a successful injury claim — combined with legal defence costs — can be devastating for an uninsured or underinsured security business.

Public Liability Insurance

Public liability insurance covers claims made by third parties — including members of the public — for injury or property damage caused by the security business or its employees. If a guard injures someone while working, a claim would typically be made against the security company's public liability policy.

For security businesses, this cover needs to be carefully tailored. Standard public liability policies may exclude or limit cover for physical restraint, use of force, or door supervisory work. It is essential that your policy specifically covers the activities your guards undertake.

Employers Liability Insurance

Employers liability insurance is a legal requirement for any business with employees in the UK. It covers claims made by employees who suffer injury or illness as a result of their work. While this does not cover claims made by injured members of the public, it is a critical part of any security business's insurance portfolio — particularly given the physical risks guards face.

Professional Indemnity Insurance

For security consultancies and companies providing advice, risk assessments, or security planning services, professional indemnity insurance covers claims arising from errors, omissions, or negligent advice. Where poor operational guidance contributes to an incident that results in injury, a PI claim may follow.

Management Liability Insurance

Directors and senior managers of security companies may face personal liability in the event of serious incidents, particularly where failures of oversight or training are alleged. Management liability insurance protects individuals in leadership roles from the personal financial consequences of such claims.

What Security Businesses Must Do After an Incident

If a security guard injures someone, how the business responds in the immediate aftermath can significantly influence the legal and financial outcome. The following steps are critical:

1. Seek Medical Assistance

Ensure the injured person receives appropriate medical attention immediately. This is not only a moral obligation but also demonstrates a duty of care that courts and insurers will take into account.

2. Preserve Evidence

Secure CCTV footage, incident logs, witness statements, and any other contemporaneous records as soon as possible. Evidence that is lost, deleted, or allowed to degrade can seriously prejudice your defence in any subsequent claim or prosecution.

3. Notify Your Insurer

Contact your insurance broker or insurer as soon as you become aware that an incident has occurred that may give rise to a claim. Failure to notify promptly can, in some circumstances, prejudice your right to indemnity under the policy.

4. Do Not Admit Liability

Neither the guard nor the business should make any admission of liability or offer of compensation without first taking legal advice and obtaining the insurer's agreement. Premature admissions can complicate the claims process and may not accurately reflect the legal position.

5. Conduct a Thorough Internal Investigation

Review the circumstances of the incident carefully. Was the guard properly trained? Was their use of force proportionate? Were they operating within the scope of their instructions? Understanding what happened — and why — is essential both for managing the claim and for preventing similar incidents in the future.

6. Review Policies and Training

Use the incident as an opportunity to audit your use of force policy, conflict management training, and incident reporting procedures. Demonstrating that you have robust procedures in place — and that you take their application seriously — can carry weight in both regulatory and legal proceedings.

Preventing Injury Incidents: The Importance of Training

The most effective way to manage the legal and financial risks associated with security guard injuries is to prevent them occurring in the first place. This means investing in high-quality training that goes beyond the minimum requirements of SIA licensing.

Key areas of training that can reduce injury risk include:

• Conflict management and de-escalation — equipping guards to resolve situations through communication rather than physical intervention wherever possible
• Physical restraint techniques — ensuring any force used is proportionate, effective, and minimises risk of harm to all parties
• Situational awareness — training guards to anticipate and manage potential threats before they escalate
• Legal awareness — ensuring all personnel understand the limits of their legal authority and the consequences of exceeding it
• Mental health and vulnerability awareness — recognising signs that an individual may be in crisis and responding appropriately

Businesses that can demonstrate a strong training culture and comprehensive operational procedures are in a far stronger position when facing legal scrutiny — whether in a civil court, a criminal investigation, or an SIA review.

How Insure24 Can Help Security Businesses

At Insure24, we work with security companies across the UK to arrange insurance that genuinely reflects the risks they face. Security industry insurance is a specialist area, and off-the-shelf policies frequently fail to provide the protection that businesses actually need.

We can arrange cover that includes:

• Public liability insurance with specific provisions for use of force and physical restraint
• Employers liability insurance meeting the legal minimum and beyond
• Professional indemnity for security consultancies and advisory firms
• Management and directors liability insurance
• Combined security industry policies tailored to your specific operations

We take the time to understand your business — the environments your guards work in, the nature of the work they carry out, and the specific risks you face — before recommending a policy. That means you can have confidence that your cover will be there when you need it.

Whether you operate a small door supervision team or a large-scale security business providing personnel to multiple clients, we have the expertise to help you put the right protection in place.

Frequently Asked Questions

Can a security guard be prosecuted for injuring someone?

Yes. If a security guard uses force that is unlawful or disproportionate, they can face criminal charges ranging from common assault to grievous bodily harm or even manslaughter. The key question is whether the force used was reasonable in the circumstances.

Who is liable if a security guard injures a customer?

In most cases, the security company that employs the guard will be vicariously liable for their actions. The client business may also share liability depending on the level of control they exercised over the guard's activities.

Does public liability insurance cover security guard injuries?

It depends on the policy. Many standard public liability policies exclude or limit cover for use of force incidents. Security businesses need specialist public liability insurance that specifically covers the activities their guards perform.

What should I do immediately after an injury incident?

Ensure the injured person receives medical assistance, preserve all available evidence, notify your insurer as soon as possible, and take legal advice before making any admission of liability.

Can a security guard lose their SIA licence after injuring someone?

Yes. Criminal convictions or cautions related to assault or use of force can result in an SIA licence being revoked. The SIA may also consider civil findings of misconduct when assessing licence renewals.

What is vicarious liability in the context of security businesses?

Vicarious liability is the legal principle that holds an employer responsible for the actions of their employees carried out in the course of employment. For security businesses, this means the company can be held legally liable for injuries caused by guards, even if the company itself acted appropriately.

Is it possible to defend a claim if the guard believed they were acting lawfully?

Yes, but the belief must itself have been reasonable. UK law allows for the use of reasonable force in defence of self or others, and courts consider what the guard genuinely and reasonably believed was necessary at the time. Proper training and documentation of the incident significantly strengthen any defence.

Conclusion

When a security guard injures someone, the consequences can be far-reaching — for the guard personally, for the security business that employs them, and for the client whose premises they were protecting. Criminal prosecution, civil compensation claims, SIA licensing implications, and reputational damage can all follow from a single incident.

The best protection is twofold: invest in rigorous training and clear operational procedures that minimise the likelihood of injury incidents occurring, and ensure your business is covered by specialist security industry insurance that will respond when a claim is made.

At Insure24, we understand the security industry and the very real risks that come with it. If you would like to discuss your insurance requirements or review your current cover, get in touch with our team today.

Call us on 0330 127 2333 or visit www.insure24.co.uk to get a quote or speak to one of our advisers.