Setting up muster points

A muster point needs to be:

  • Far enough from the site: At least 50 metres from the nearest building or hazard, though the required distance depends on the nature of the site. A site handling explosives or flammable materials needs a greater exclusion zone.
  • Large enough: The assembly area must accommodate the maximum number of people who could be on site at any one time.
  • Accessible: Workers must be able to reach the muster point from any part of the site without passing through the emergency area.
  • Clearly signed: Standard green assembly point signage, visible from the approach routes.
  • On stable ground: Not in a muddy field that becomes impassable in wet weather.

On larger sites, you may need multiple muster points for different zones. Each zone should have its own designated coordinator responsible for the headcount in that area. The key is that every worker knows which muster point they go to. This should be covered in the site induction.

The headcount problem

The most critical part of any muster procedure is accounting for everyone. The question is simple: is everyone who was on site now at the muster point? The answer depends entirely on the accuracy of your attendance records.

If you know exactly who is on site at any given moment, the headcount is a comparison exercise: match the people at the muster point against the list of people on site. Anyone missing triggers the search protocol.

If you do not know exactly who is on site, because sign-out records are incomplete, because paper sheets are back at the gate, or because visitors were not logged, the headcount becomes guesswork. And in an emergency, guesswork about whether someone is still inside a building is not acceptable.

Paper-based muster: how it works (and fails)

The traditional paper muster process:

  1. Alarm sounds
  2. Everyone evacuates to the muster point
  3. Someone retrieves the sign-in sheet from the gate (assuming the gate is not in the emergency zone)
  4. A supervisor reads through the sheet, calling out names
  5. Workers respond. Those who signed in but signed out are removed from the list. Those who forgot to sign out are assumed to still be on site.
  6. Anyone unaccounted for triggers a search

This process has predictable failure points. The sign-in sheet may be at the other end of the site. Workers who forgot to sign out appear as still on site when they left hours ago. Visitors who were not logged at all do not appear on the sheet. On a site with 200 workers, reading through a paper list and calling names takes five to ten minutes. Five minutes in which someone could be trapped in a building.

During a drill, these delays are frustrating. During a real emergency, they are dangerous.

Digital muster: real-time headcounts

A digital workforce management system changes the muster process fundamentally. Because the system knows exactly who is on site in real time (based on digital clock-in and clock-out data), the headcount list is ready the moment the muster starts, without anyone fetching a sheet from the gate.

The digital muster process:

  1. The site alarm sounds and a supervisor on site starts the muster from their phone
  2. Everyone clocked in on that site is alerted on their phone and told where the muster point is
  3. Workers confirm they are safe from their own phone as they reach the muster point
  4. The supervisor's roll call shows how many people are accounted for and lists, by name, everyone still outstanding
  5. The supervisor chases the outstanding names in person, then stands the muster down and the all clear goes out

In AttendIQ's emergency muster, an on-site supervisor starts the muster in the mobile app, with a confirmation step so it cannot be set off by accident. Everyone clocked in on that site, whichever company employs them, gets a push notification with the muster point (and an email where one is on file), and taps "I'm safe" in the app. The supervisor's roll call shows "accounted for" against the total and the names still outstanding, and refreshes as responses come in. When the site is clear, the supervisor stands the muster down and everyone who was on site is told it is safe to resume work. Muster is not a substitute for the site alarm or for calling the emergency services: the app does not call 999, so someone still needs to make that call.

The list is built from clock-ins and clock-outs, so it avoids the false positives from workers who forgot to sign out on paper. Visitors are deliberately not on the muster roll call: a visitor should always be accompanied, so they are accounted for through the host who is. Visitors signed in through AttendIQ (Complete plan) still show on the live on-site board in the web app. Make sure delivery drivers and anyone else who is not clocked in are covered by your procedure.

Running effective drills

The Regulatory Reform (Fire Safety) Order requires regular fire drills. For construction sites, HSE recommends drills at intervals appropriate to the risk, and at least whenever the site layout changes significantly (new buildings, changed escape routes, new muster points).

An effective drill tests the full process:

  • Can the alarm be heard from every part of the site?
  • Do workers know where to go?
  • Can supervisors produce a complete headcount within the target time?
  • Are visitors and delivery drivers included in the count?
  • Are there any physical obstructions on the evacuation routes?

Record the results of every drill: time to complete the headcount, number of workers on site, any issues identified. These records demonstrate to HSE that you are actively testing your emergency procedures, not just documenting them. For the full picture of what CDM 2015 requires in terms of site records, see our CDM 2015 guide for contractors.

Multi-contractor sites

On a site with multiple subcontractors, the muster procedure becomes more complex. Each subcontractor may have their own supervisor, their own gang, and their own communication channels. The principal contractor needs a system that gives them visibility across all contractors simultaneously.

The common failure on multi-contractor sites is that each subcontractor supervisor accounts for their own workers, but nobody aggregates the data. The PC site manager asks each supervisor "Are all your people accounted for?" and gets a series of "Yes" answers, but has no way to verify that the total matches the total number of people on site.

A digital system solves this by providing a single source of truth. Every worker, regardless of employer, is on the same platform. The muster list is generated from the same clock-in data. The supervisor running the roll call sees one total and one list of unaccounted workers across every employer on site, not a set of verbal confirmations from individual supervisors.

For sites with multiple zones and muster points, agree in advance which zone coordinator chases which outstanding names, and brief the zones at induction, so the single site-wide list is worked through quickly.

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