​Smoke Detector Requirements For One- and Two-Family Dwellings

Effective for building permits dated after July 1, 1999
Location of Smoke Detectors
Smoke detectors shall be located:
  • in each sleeping room
  • outside of each separate sleeping area (must be located per manufacturer's instructions, usually within 15 feet)
  • on each additional story (excluding unfinished attics)
  • in basements and cellars
  • in units with split levels, smoke detectors need be installed only on the upper level, provided the lower level is less than one full story below the upper level. If there is a door between levels, then a detector is required on each level.
 The Unit Shall:
  • be interconnected such that the actuation of one alarm will actuate all alarms
  • be approved and listed and shall be installed in accordance with manufacturer's instructions.
 Power Source
Some detectors shall:
  • receive their primary power from the building wiring when such wiring is served from a commercial source – when primary power is interrupted, shall receive power from a battery
  • be supplied by a single branch circuit serving one or more of the required lighting outlets and permanently connected ahead of the switching devices.
Smoke detector(s) may be omitted where equivalent protection is provided by a central system.