What are the Martyn's Law tier thresholds?

Martyn's Law sets two tier thresholds based on reasonably-expected capacity: standard tier for premises that can hold 200 to 799 people, and enhanced tier for premises that can hold 800 or more. The standard tier carries a procedural duty; the enhanced tier carries a substantially heavier documented, personal-liability duty. The line between them sits at 800.

The four named public protection procedures apply to both tiers and are the operational baseline: evacuation (getting people out), invacuation (bringing people in to a safer area), lockdown (securing in place) and communication (the messaging across all of those). The standard tier's "reasonably practicable" duty means the procedures must exist and be workable, but the bar is broadly proportionate to the venue's size and means.

Enhanced tier adds the four formal categories of public protection measures: monitoring (CCTV, behavioural detection, perimeter surveillance), movement (queue management, vehicle exclusion, pedestrian flow), physical safety and security (hostile vehicle mitigation, blast film, secure rooms), and security of information (operational data handling, staff vetting). Each category is implementable through people, policies and processes, physical mitigations, or both. The Section 27 statutory guidance frames it as a narrative-style compliance document rather than a tick-box form. Strive AV's Martyn's Law guide walks through each category in detail, and the compliance service maps them to existing AV and life-safety infrastructure.

Quick reference: standard 200-799 capacity, four named procedures, £10k cap, no documentation required; enhanced 800+, adds four formal measure categories, documented assessment, named responsible person, SIA notification, £18m or 5% global revenue, personal criminal liability for senior individuals.