Troy, MI Fire Regulations: Smoke Detectors (2026)

2 of Chapter 82 (Property Maintenance Code) requires single or multiple-station smoke alarms in Groups R-2, R-3, R-4 and in dwellings not otherwise regulated as a Group R occupancy, regardless of occupant load, at three locations: on the ceiling or wall outside each separate sleeping area near bedrooms, in each room used for sleeping, and in each story of the dwelling unit including basements and cellars (crawl spaces and uninhabitable attics excluded). A split-level unit without an intervening door between levels can rely on the upper-level alarm to cover an adjacent lower level less than one full story below.

3 requires alarms in Group R occupancies to draw primary power from building wiring fed by a commercial source, backed up by battery, and to signal when batteries run low, with an exception allowing battery-only alarms in buildings not served by commercial power or during limited alterations that don't expose the structure. 4 requires interconnection where more than one alarm is installed in a unit, so activating one activates all of them, audible in every bedroom over background noise with doors closed, subject to exceptions for buildings not undergoing alteration or construction.

1 ties the whole chapter to the Troy Fire Code (Chapter 93) for fire protection systems generally, but the smoke-alarm text itself is codified in Chapter 82.