How we check the rules
Every date PremiseBay shows comes from a written rule we have read: 32 rules today, drawn from 57 sources, last read Oct 23, 2026.
Where the rules come from
The national baseline comes from the NFPA standards most states adopt (NFPA 10 for extinguishers, 25 for sprinklers, 72 for alarms, 96 for kitchen hoods and 17A for kitchen suppression), read through OSHA and the fire authorities that quote them, because NFPA's own text sits behind a paywall. State rules come from the state's statutes and administrative code and the agencies that enforce them. City rules come from city codes and the utility pages that run grease and backflow programs.
Most specific wins
For any building, the checker uses the city's rule if the city has one, then the state's, then the national baseline. When it falls back to the baseline it says so, so you never mistake a national default for your state's own law.
When we can't confirm something
We leave it out. A rule we could only find in a search summary, or on a page that would not load, is not used until we have read the source itself. A missing rule tells you to ask; a wrong one tells you something false.
Your authority has the final word
Fire marshals, water utilities and insurers can set stricter terms for a particular building. If yours has told you something different, follow them, and tell us so we can check it.