Sprinkler and alarm inspection frequencies: a reference shelf
Updated August 2026
Water-based systems and fire alarm work sit outside what we build. People ask about them constantly, the published answers almost never say where they came from, and that is a gap worth filling honestly even when it is not our trade.
About this shelf. This is reference material, not a page about what we build. Our own work is portable fire extinguishers, pre-engineered kitchen suppression, and emergency lighting.
No primary source for these frequencies was obtained. The standard is the authority, the edition your jurisdiction adopted governs, and the figures below come from labelled secondary summaries.
NFPA 25 inspection frequencies: what the standard organises, and what "annual" means
A reference reading of the water-based systems frequency table, plus the detail most summaries drop: a frequency in NFPA 25 is a window, not an anniversary.
NFPA 72 inspection frequencies, and the disagreement nobody else records
Two vendor sources give different answers for smoke detector testing. This page records the conflict instead of picking a side, and says how to settle it.
What we do cover
Our own pages are about portable extinguishers, pre-engineered kitchen suppression and emergency lighting: the intervals, who is licensed to do the work in each state, and what a service tag has to say.
Extinguishers, kitchen suppression and exit lighting on one record
GaugeRoute keeps those three asset classes on their schedules and the service on the record. Sprinkler and alarm systems are not among them.