A fire watch is one of the least glamorous parts of fire protection, and one of the most misunderstood. It’s not a system at all — it’s a temporary, human-staffed substitute for one.
When a Fire Watch Is Required
Most commonly, a fire watch is triggered when a required fire protection system is impaired or out of service: a sprinkler system shut down for repair, a fire alarm panel offline for replacement, or hot work (welding, cutting) happening in a building without active suppression coverage in that area. Local fire code and your AHJ (Authority Having Jurisdiction) determine exactly when one is required and for how long.
What a Fire Watch Actually Involves
A trained person patrols the affected area at a set interval, typically every 30 to 60 minutes, watching for signs of fire and prepared to sound an alarm and begin evacuation if needed. They generally carry a portable extinguisher and a means to notify the fire department, and keep a log of each patrol.
It’s Meant to Be Temporary
A fire watch is not a long-term substitute for a functioning fire protection system, it’s a stopgap while a system is being repaired or restored. Extended impairments typically require notifying the local fire department and, in some jurisdictions, the AHJ directly. See our Maintenance & Repair guide for what typically triggers a system to go offline in the first place.