A candle in a closet starts a fire on the eighth floor of a 15-story apartment building in Silver Spring, Maryland. The resident tries to put it out herself before the smoke alarm even finishes its first cycle. There is no sprinkler head above her to help. By the time roughly 70 firefighters arrive, she is burned and two cats are dead, and crews are hauling hose up a stairwell that was never built to assume a sprinkler system would catch the fire first.
The short answer: a building that was constructed without required sprinklers, and has never had them, is not sitting in an active impairment, so the classic NFPA 101 evacuate-or-fire-watch clock does not start on its own. The fire watch trigger shows up later, when that same building starts the sprinkler retrofit its state now mandates, or when an existing alarm or standpipe system goes down during that work.
That distinction matters because a wave of older high-rises nationwide are entering exactly that phase right now. Montgomery County alone has identified 76 residential high-rises without sprinklers inside individual units, and a state legislative workgroup found roughly 300 such buildings statewide, nearly all built before 1974. Maryland passed a law requiring full retrofits by 2033. Every one of those projects will eventually need a documented answer to the fire watch question — just not the answer most property managers expect.
A Late-Night Apartment Fire Exposed a Gap That Predates the Code
Fire investigators traced Friday night’s fire to a candle that ignited combustible material inside a closet on the eighth floor. Montgomery County Fire and Rescue Service units confined the blaze to the single unit, though two neighboring apartments took on water damage from the firefighting effort. The resident suffered non-life-threatening burns after trying to fight the fire herself instead of evacuating immediately, which fire officials generally advise against for an untrained occupant facing an active flame.
The building’s lack of in-unit sprinklers was not incidental to how the response unfolded. Firefighters still had to rely entirely on manual suppression and compartmentation — closing the door, confining the fire to one unit — because there was no automatic system working the fire in the seconds before the first engine arrived. That is the operational cost of the sprinkler gap, independent of whatever caused the fire in the first place. A working sprinkler head typically knocks a closet-sized fire down to a trickle before it ever reaches the hallway; without one, the outcome depends entirely on how fast a resident reacts and how fast the first engine gets there.
The gap is not unique to this address. The same county government review that counted 76 un-sprinklered high-rises came after a fatal three-alarm fire at another un-sprinklered Silver Spring complex in February 2023 killed one resident and injured 19 others. That fire pushed Maryland to pass a retrofit law with a 2033 statewide deadline, and a companion rule that has required written lease disclosures for un-sprinklered high-rise rentals since January 2025. Candles remain one of the most common ignition sources behind these incidents — the National Fire Protection Association estimates U.S. fire departments respond to roughly 5,800 home structure fires started by candles every year, with close to 60 percent traced to combustible material placed too near an open flame. Pets are disproportionately at risk in exactly this kind of fire: national estimates put annual U.S. pet deaths from residential structure fires at roughly 40,000, almost all from smoke inhalation rather than direct flame contact.
NFPA 101’s Evacuate-or-Watch Rule Only Starts Once a Required System Exists to Fail
NFPA 101, the Life Safety Code, sets the rule most occupied buildings actually live under: when a required sprinkler or fire alarm system goes out of service beyond its allowed window, the building must either evacuate the affected area or stand an approved fire watch until the system is restored. The NFPA 101 evacuate-or-watch rule commonly allows 10 hours within a 24-hour period for a sprinkler outage and 4 hours for an alarm outage before that decision becomes mandatory, subject to what your local authority having jurisdiction (AHJ) has adopted.
Notice what that rule assumes: a required system that is currently out of service. A high-rise built in 1968 under a code edition that never required in-unit sprinklers is not “impaired” in the code sense — there is nothing to tag, repair, or restore, because nothing was ever installed. No clock starts at hour zero because no system exists to fail. That is the uncomfortable mechanical truth behind buildings like this one: the absence of a system is a code gap, not an impairment, and it does not by itself generate a fire watch requirement under NFPA 101 or the equivalent evacuate-or-watch language in the International Fire Code.
This is also why the grandfathering question comes up so often with older high-rises. Most building codes apply to new construction and major renovations at the time they’re adopted; they rarely force an existing building to retrofit just because a newer code edition raised the bar, unless a separate statute — like Maryland’s retrofit law — steps in and sets its own deadline. Until that deadline arrives, or until the building otherwise triggers an impairment on a system it does have (the existing fire alarm, the standpipe, the stairwell pressurization fans), there is no automatic fire watch obligation tied to the missing sprinklers themselves.
What does change the picture is a legislative mandate like Maryland’s. Once a jurisdiction sets a retrofit deadline, the building’s fire protection timeline bends toward a construction project, and construction projects are exactly where impairment rules, hot work rules, and fire watch requirements start applying in force.
A Sprinkler Retrofit Creates Its Own Fire Watch Trigger
Installing sprinklers in an occupied high-rise is not a weekend job. Crews run new risers through stairwells, cut into ceilings floor by floor, and frequently have to take the existing fire alarm system partially offline while they tie in new sprinkler flow switches and tamper alarms. Each of those steps can start its own NFPA 101 or NFPA 25 clock on whatever system is affected, even though the sprinkler system itself was never required before.
Hot work is the more immediate trigger. Welding, cutting, and soldering risers and standpipe connections inside an occupied building falls under NFPA 51B’s hot work fire watch duties: a trained attendant, equipped with an extinguisher, has to remain on the hot work area during the work and for a defined period after work stops, watching for smoldering material that doesn’t ignite until after the crew has moved on. A retrofit spanning dozens of floors over months means dozens of discrete hot work fire watch assignments, not one continuous watch for the whole building. On a 15-story, 330-unit scope, that can mean a new hot work fire watch assignment nearly every working day for a year or more, each one closed out with its own log entry before the crew moves to the next floor.
Separately, if the contractor’s work requires taking the existing fire alarm system out of service for a riser tie-in or panel reprogramming, that outage runs on the normal NFPA 101 and NFPA 72 clock — typically 4 hours before the building must choose between evacuating the affected floors or standing an approved fire watch until the alarm is restored. An occupied residential high-rise almost never evacuates for a scheduled alarm outage; it watches instead, because emptying 330 occupied units costs far more than staffing guards for the hours the panel is down.
Standpipe work adds a third wrinkle. If the retrofit temporarily disables the building’s standpipe system — the pipe network firefighters connect hose lines to on upper floors — many AHJs treat that as its own impairment requiring notification and, depending on building height and occupancy, a fire watch for the duration, independent of whatever is happening with the alarm or the new sprinkler risers.
Cost is the practical reason most buildings choose the watch over evacuation once an alarm or standpipe outage starts, and the math is straightforward: guard coverage for a known outage window is a fixed, budgetable line item, while relocating even a fraction of 330 households for the same hours means hotel costs, moving logistics, and lost rent that dwarfs a few hundred dollars an hour in guard pay. That arithmetic is exactly why the code gives occupied buildings the choice in the first place, rather than mandating evacuation outright.
What a Fire Watch Guard Actually Does During Retrofit Work
A guard covering hot work or an alarm outage during a sprinkler retrofit works from a short, specific list of duties, not a vague patrol. Coverage runs continuous rounds through the affected floors and any area where hot work happened that shift, because smoldering insulation or debris can ignite hours after the torch is off.
The guard watches for fire, smoke, and blocked exits on every round, keeping stairwells and corridors clear even while construction material is staged nearby. Notification procedure matters as much as detection: the guard needs the fire department’s direct number, the building’s own alarm panel location, and a clear chain for reaching building management and the contractor’s site supervisor if something starts. Every round gets logged with a timestamp, because that patrol log is what the AHJ reviews before signing off on the next phase of work.
The guard also verifies extinguisher placement and readiness along the construction route, since a retrofit crew staging material in a stairwell or corridor can block or bury equipment residents and firefighters both expect to find in its usual spot. A displaced extinguisher gets flagged and relocated the same shift, not noted for a weekly report.
The guard does not perform hot work, does not substitute for the contractor’s own attendant on an active torch, and does not make the engineering call on when the new system can go live. The watch exists to catch what the system in progress cannot yet catch itself.
What a Property Manager Should Do Before the Retrofit Crew Shows Up
Start the impairment program in writing before work begins, not after a subcontractor is already on site. Scope exactly which system segments go down, floor by floor and day by day, and get that plan in front of the AHJ for acceptance before the first riser gets cut.
A workable pre-retrofit checklist looks like this:
☐ Written impairment plan scoped by floor and date, submitted to the AHJ for acceptance
☐ Fire watch coverage scheduled for every hot work shift and any alarm or standpipe outage window
☐ Current lease disclosure language confirming the building lacks full sprinkler coverage
☐ Notification chain posted at the building’s command post: fire department, building management, contractor supervisor
☐ Patrol logs and AHJ notifications filed by floor and by date, not in one combined folder
☐ A standing answer for what happens if the retrofit schedule slips and an impairment window runs long
Line up fire watch coverage for the specific windows the plan identifies — hot work shifts, any alarm zone outage, and any period the standpipe is out of service for tie-ins — rather than staffing one guard for the length of an entire multi-month project. That approach keeps cost tied to actual risk windows instead of calendar time, and it gives the AHJ a cleaner record to review floor by floor.
Confirm the lease disclosure language required for un-sprinklered buildings is current, since Maryland’s Section 9-403 requirement runs independently of the retrofit schedule and applies as long as full coverage is still outstanding. Keep the patrol logs and AHJ notifications filed by floor and by date; a multi-year retrofit generates a paper trail large enough that a loose folder stops being workable by month three.
If a contractor proposes skipping a documented fire watch for a hot work window to save a day on schedule, treat that as a decision for the AHJ, not for the contractor. The code language is “approved” fire watch, and your fire marshal can reject a plan that does not hold up before the floor is reopened to residents.
Fire watch coverage during a retrofit, an alarm outage, or any other impairment is what The Fast Fire Watch Company exists to provide: firefighter-run guards on site in under 3 hours, 24/7, anywhere in the country. Call 1-800-899-7524 to scope hot work or alarm-outage coverage for a Maryland retrofit project, or visit fastfirewatchguards.com to see how fast guards can be staged for your building.
