You manage a 1970s apartment building with no fire sprinklers. It was built before the code required them, so it has stood grandfathered for decades — passing every occupancy inspection because nothing required it to change. Then a unit catches fire at 2 a.m., the roof is burning, and every resident on that stairwell is standing outside in the cold while the fire marshal decides what happens to the building next.
A fire watch requirement can attach to a building the moment protection turns out to be absent or damaged — not only when a system that already exists gets shut down for repair. If your building has no sprinklers, or a fire just destroyed the only detection zone in a wing, the authority having jurisdiction (AHJ) can order continuous patrols until the gap closes. The trigger is the protection gap itself. Evacuation is the fallback. A documented fire watch is usually what lets residents stay housed while the building gets sorted out.
What happened in Fitchburg, and why it’s the clean example
An early-morning fire in a Fitchburg, Wisconsin apartment building on September 6 makes the point directly. Fitchburg firefighters were dispatched to a structure fire just before 2 a.m. and, on arrival, found smoke and flames coming from the building’s roof. Fire crews confirmed one unit was on fire, and that the building had no sprinkler system installed at all. Crews extinguished the fire, and damage stayed largely contained to that single unit — but every resident in the building was displaced due to smoke and fire damage. No injuries were reported. The Red Cross is assisting displaced residents while Fitchburg Fire Department investigates the fire’s origin and cause. (Source: reporting by Anna Hansen, Wisconsin State Journal, distributed via Tribune Content Agency and republished by Fire Engineering.)
What makes this event a clean fire watch example, rather than just a bad night, is the combination of facts on the ground: the building had zero built-in fire protection to fall back on, the fire spread to the roof before crews knocked it down, damage was still contained to one unit, and the residents in the other units were displaced but the building itself is still standing. That combination — occupied structure, real fire, no sprinkler backstop, and a cause still under investigation — is exactly the scenario where a fire marshal weighs evacuation against a documented watch for the units that can safely be reoccupied while the investigation and any retrofit proceed.
It also illustrates a distinction worth being precise about: this was not a system that failed. It was a building that was never required to have one. Many mid-century apartment buildings, especially two- and three-story garden-style properties like the one in Fitchburg, were built and occupied years before local fire codes began requiring automatic sprinklers in multifamily residential construction. That grandfathered status protects the building from a retrofit mandate right up until something changes it — a fire, a renovation that triggers code compliance, or a fire marshal’s post-incident order. A fire that reaches the roof and displaces an entire building is precisely the kind of event that changes it.
An unsprinklered building can still trigger a fire watch requirement
NFPA 101, the Life Safety Code, is the standard that decides what happens to the people inside a building when required protection is missing or fails. It does not care whether a system was shut off for repair or was never installed in the first place — either way, the occupants are exposed, and the code’s answer is the same underlying choice: evacuate the affected areas, or provide an approved fire watch until protection is restored or installed.
NFPA 101 sets that rule by occupancy type. Apartments, hotels, hospitals, schools, and assembly spaces each carry their own life-safety chapter, and each one leans on NFPA 25 for sprinkler maintenance and NFPA 72 for alarm systems before adding its own requirement for the people inside. When a required system is out of service, the commonly adopted windows are more than 4 hours for alarms and more than 10 hours for sprinklers within a 24-hour period before the evacuate-or-watch decision becomes mandatory under the commonly adopted edition. A building that never had sprinklers to begin with, or that just lost its only fire-damaged detection zone, lands in that same evacuate-or-watch position the moment the AHJ decides the remaining occupants are exposed to unmitigated fire risk.
Read the full breakdown of that threshold, the documentation the AHJ expects, and how NFPA 101 relates to NFPA 1 and CMS enforcement in the NFPA 101 evacuate-or-watch rules. It covers the alarm and sprinkler windows and how your state fire marshal applies them.
The fire marshal decides whether the building empties or a watch stands
NFPA 101 hands the actual decision to the AHJ — usually the local fire marshal, sometimes a state fire marshal under a statute like Florida’s FS Chapter 633. The code does not evacuate or staff anything by itself; it gives the fire marshal the authority to weigh occupancy, hazard, and the practical reality of displacing dozens of residents versus posting a guard.
For a building like the Fitchburg property, where damage was contained to one unit but the whole structure took smoke and possibly water damage, and the roof itself burned, the fire marshal has several live variables to weigh: is the structural integrity of the roof and upper floor confirmed safe for reoccupancy, is the building’s electrical system intact after fire exposure, and does the building’s lack of sprinklers now factor into how long any partial reoccupancy is tolerated. A fire marshal can order a watch on the undamaged units while the burned unit and the fire’s cause remain under investigation, particularly once the immediate life-safety hazard (active fire, smoke) is cleared but the underlying protection gap (no sprinklers) is not.
That order typically covers three things in writing: a notification of what happened and what remains impaired or absent, a record of who authorized continued occupancy and under what conditions, and a schedule for restoration, repair, or retrofit. If the building genuinely never had sprinklers and current code now requires them as a condition of continued multifamily occupancy after a triggering event, the fire marshal’s order can extend well past the immediate aftermath. A fire watch becomes the bridge between “no sprinklers” and “sprinklers installed and tested,” and that bridge can run weeks, not hours, depending on contractor scheduling and permitting.
What a guard actually does during an unprotected-building watch
A fire watch guard covering an unsprinklered or fire-damaged building is not there to fight the next fire. The role is detection, notification, and documentation, executed on a schedule the AHJ accepts, not on whatever interval feels convenient.
- Patrol. Continuous rounds through every occupied area lacking active fire protection, on an interval the fire marshal’s order specifies — commonly every 30 to 60 minutes in occupied residential buildings, though the AHJ sets the actual number.
- Detect. Watch for smoke, unusual odors, exposed or damaged wiring in units still being repaired, and blocked or propped-open fire doors that undermine whatever compartmentation the building still has.
- Notify. Call the fire department immediately on any find, and follow the property’s occupant-notification plan — a building intercom, door-to-door knocks, or a phone tree for displaced residents who have returned to collect belongings.
- Log. Keep a timestamped patrol log the AHJ can review on demand: which unit was checked, when, what was found, and who signed off on each round.
The guard does not perform electrical work, does not clear the fire scene for reoccupancy, and does not substitute for a working sprinkler or alarm system. The watch buys time and documents that someone was actively checking for fire while the real fix — sprinkler retrofit, rewiring, structural repair to the roof — gets scoped and completed. A guard finding a hazard during a round is a data point for the fire marshal’s decision on whether the watch continues, tightens, or converts to an evacuation order.
NFPA 25 governs the system once retrofit work actually starts
NFPA 25 does not apply to a building with no sprinklers at all; it governs inspection, testing, and maintenance of water-based systems that already exist. It becomes directly relevant the moment retrofit work begins, because installing new sprinklers in an occupied building creates the same impairment sequence NFPA 25 Chapter 15 requires whenever a system goes out of service for any reason: an impairment coordinator, a tag on the affected zone, notification to the fire department and the building’s insurer, and a fire watch as the standard mitigation while that zone sits unprotected.
In practice, a building moving from “no sprinklers” to “sprinklers installed” often needs a fire watch twice over — once under NFPA 101 while the fire marshal weighs the immediate occupancy risk after an incident like Fitchburg’s, and again under NFPA 25 once retrofit construction is underway and each newly piped zone goes through its own impairment window before it is tested, flushed, and accepted by the AHJ. Property managers who plan for a single watch period and then get surprised by a second one mid-installation lose both time and the retrofit schedule they promised the fire marshal.
The impairment coordinator role matters here specifically because it is the single point of contact tracking every tag, notification, and mitigation step across what can be a multi-week retrofit. Missing that coordination is one of the most common reasons a fire watch runs longer, and costs more, than the property team originally scoped. The NFPA 25 impairment program requirements lay out exactly what the coordinator, tag, and notification sequence look like once a system exists to impair — worth reading before signing a retrofit contract, not after the contractor is already on site pulling permits.
What a property manager should do this week
If your building lacks sprinklers, or just lost protection to fire damage, the checklist is short and the order matters:
- Call the fire marshal before they call you. Report the damage and the building’s actual protection status, including the absence of sprinklers. A voluntary, complete disclosure reads very differently to an AHJ than a violation notice discovered later.
- Get the order in writing. Ask explicitly whether the AHJ requires full evacuation, a fire watch across the whole building, or a hybrid — some units evacuated for structural reasons, others watched and reoccupied.
- Staff the watch with dedicated personnel. Most AHJs and insurers require guards with no other duties during the watch period, not a maintenance technician doing rounds between unrelated work orders.
- Start the retrofit conversation now, not after the order expires. If sprinklers are genuinely required as a condition of continued occupancy and currently missing, get a licensed fire-protection contractor’s timeline in front of the fire marshal early — it directly affects how long the interim watch has to run.
- Keep the log running even during a partial evacuation. Documentation of who checked what and when protects the property if the cause investigation or an insurance claim runs long after residents return to the building.
None of these steps are optional add-ons to a compliance checklist. They are the sequence an AHJ expects to see documented if the building is ever asked to prove, months later, that it managed the gap responsibly rather than just waiting it out.
The Fast Fire Watch Company puts firefighter-trained guards on unprotected buildings nationwide, with certified guards on site in under 3 hours, 24/7. Whether the fire marshal ordered a watch after an event like Fitchburg’s or your building is mid-retrofit and needs coverage while new sprinklers go in, call 1-800-899-7524 or visit our fire watch services page to get a guard scheduled before the AHJ’s deadline arrives.
