Smoke Detectors for Residential Dwellings

When and What is Required

Built Prior to 1977

There were no smoke detector requirements. If no smoke detector upgrades have been done, then one battery-operated smoke detector is required on each level including the basement.

Built from January 1, 1977 – February 21, 1983

These dwellings were built with an electric smoke detector on the sleeping level and in the basement. They were not interconnected. The original smoke detector system must be working and a battery-operated detector must be installed on any level not currently equipped with a detector.

Built from February 22, 1983 – April 30, 1993

These dwellings were built with an electric smoke detector on every level including the basement. They were interconnected. The original smoke detector system must be working.

Built from May 1, 1993 – Present

These dwellings were built with interconnected electric smoke detectors with battery backup. This system will be tested from the electrical system and the battery system. Please be prepared to turn off the electrical breaker for the battery test. Detectors are located on every level including the basement, in the vicinity of sleeping areas, and in every bedroom. The original smoke detector system must be working.

Additional Information

• When a dwelling has undergone a modification or increase in size that would have required an upgrade in the smoke detector system, the new system must be in working order.

• Ceiling mounting of smoke detectors is best. 6 inches of clearance are required around smoke detectors for better air current and detection of smoke.

• The rules regarding a split-level dwelling allow you to eliminate a smoke detector on one level when there is a smoke detector on the level above and no intervening door between the levels.

• Do not locate battery operated smoke detectors within five (5) feet of the kitchen or bathroom.

• Smoke Detectors on the basement level must be located at the bottom of the basement stairs.