What is Martyn's Law? Who does it apply to and how can you prepare?

Public safety has become an increasingly important consideration for building owners, operators, and facilities managers. One of the most significant recent developments in this area is the introduction of Martyn’s Law, formally known as the Terrorism (Protection of Premises) Act 2025.

Below, we explain what Martyn’s Law is, who it applies to, what organisations need to do to comply, and how OMNIA Building Consultants can support you in meeting your obligations.

What is Martyn’s Law?

Martyn’s Law is new UK legislation designed to improve protective security and organisational preparedness at publicly accessible premises and events. The law was named in memory of Martyn Hett, who tragically lost his life in the 2017 attack at the Manchester Arena, and aims to ensure that organisations are better prepared to respond to potential terrorist attacks.

The law requires those responsible for certain premises and events to consider how they would respond to a terrorist attack and, in some cases, take additional measures to reduce vulnerabilities and protect people from harm.

Although the Act received Royal Assent in April 2025, there is expected to be an implementation period of at least 24 months before the legal duties come into force, allowing organisations time to prepare.

Who Does Martyn’s Law Apply To?

Martyn’s Law applies to both premises and events, provided they meet specific criteria.

Premises in Scope

A building or site will fall within the scope of the legislation if it:

• Contains at least one building

• Is mainly used for specified public-facing purposes, such as retail, hospitality, leisure, entertainment, or similar uses

• Can reasonably be expected to have 200 or more people present at the same time (including staff)

• Is not excluded under the legislation

Premises where 800 or more people may be present are subject to additional requirements.

This means a wide range of locations could be affected, including:

• Shopping centres and retail outlets

• Hotels, bars, restaurants, and nightclubs

• Entertainment venues and visitor attractions

• Sports grounds and leisure facilities

• Transport hubs and public buildings

• Healthcare and education facilities

• Places of worship and community spaces

Events in Scope

Certain events will also be covered if they:

• Are accessible to the public

• Take place at a location that is not already classified as an enhanced duty premises

• Are expected to host 800 or more attendees at one time

• Include controlled entry arrangements, such as ticket checks

• Are not excluded under the Act

Examples could include concerts, festivals, exhibitions, or outdoor events.

Who is Responsible for Compliance?

The legislation places responsibility on the “responsible person”, typically the individual or organisation that has control of the premises or event.

This could include:

• Building owners or operators

• Facilities or estate managers

• Event organisers

• Venue management companies

The responsible person must ensure appropriate procedures and measures are in place and maintained.

What Do Facilities Need to Do to Comply?

Martyn’s Law introduces a tiered approach, meaning the requirements depend on the number of people expected at a premises or event.

Standard Duty Premises (200 – 799 people)

Responsible persons must:

• Notify the Security Industry Authority (SIA) of their premises

• Put in place appropriate public protection procedures

  
  

These procedures are intended to help staff and occupants respond safely to a terrorist incident. They typically include:

• Evacuation and invacuation procedures

• Lockdown procedures

• Communication strategies during an incident

These measures are designed to be practical and low-cost, focusing on preparedness rather than physical security installations.

Enhanced Duty Premises and Qualifying Events (800+ people)

In addition to the standard requirements, enhanced duty locations must:

• Implement protective security measures to reduce vulnerability to attacks

• Assess and document the effectiveness of these measures

• Provide documentation to the SIA

• Appoint a senior individual responsible for compliance (where applicable)

These additional measures may include monitoring arrangements and other security controls aimed at reducing risks and protecting people.

How Will Martyn’s Law Be Enforced?

A new regulatory function within the Security Industry Authority (SIA) will oversee compliance. The SIA will provide guidance and support but will also have powers to issue compliance notices, financial penalties, and restrictions where organisations fail to meet requirements.

How OMNIA Can Help

Preparing for Martyn’s Law can be complex, particularly for organisations managing large or multi-use buildings. OMNIA can support clients at every stage of compliance by providing expert, practical, and proportionate advice.

Risk and Preparedness Assessments

OMNIA can conduct detailed building and operational risk assessments, identify vulnerabilities and provide clear, practical recommendations tailored to each facility.

Compliance Planning

Our team supports the development of public protection procedures and, where required, enhanced security measures aligned with the legislation.

Capacity and Occupancy Assessments

Accurate occupancy calculations are critical under Martyn’s Law. We provide professional assessments to help determine which tier applies to your premises.

Documentation and Reporting

We assist with the preparation of required compliance documentation and guidance on maintaining records for regulatory purposes.

Design and Security Integration

Our consultancy services include guidance on integrating physical security measures into building design, refurbishment projects, and facility upgrades, ensuring compliance is achieved in a cost-effective and practical manner.

Ongoing Consultancy Support

Martyn’s Law requirements are likely to evolve alongside statutory guidance. We provide ongoing support to help clients stay compliant as the legislation develops.

Preparing for the Future

While the legal duties are not yet in force, organisations that begin preparing now will be better positioned to meet the new requirements and protect the people who use their premises.

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Martyn’s Law represents a significant step towards improving public safety across the UK, encouraging organisations to take a proactive and structured approach to counter-terrorism preparedness.

If you would like to discuss how Martyn’s Law may affect your buildings or facilities, OMNIA Building Consultants is here to help. Contact our team today to start planning for compliance and strengthening the safety of your premises.