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Smoke and Carbon Monoxide Alarm Regulations

A state law regarding battery-powered smoke alarms designed to reduce home fire deaths became effective on January 1, 2018. A hardwired and battery backed interconnected smoke detector must be present and operational on every level excluding unoccupied attics, garages or crawl spaces. Wireless remote interconnection is acceptable as long as the smoke detectors are hardwired and approved by a recognized testing lab such as UL and are listed and approved for sale, installation and use in Maryland by the Office of the State Fire Marshal. To ensure interconnection works properly, units must be from the same manufacturer. Smoke alarm units 10 years or older must be replaced.

Single Family Home

  1. A hardwired smoke detector with a battery backup must be located in the corridor or hallway outside of sleeping areas and on every level of the dwelling unit.
  2. If the home has a basement, a hardwired smoke detector with a battery backup must also be located in the basement and must be interconnected to the smoke detectors on all levels of the dwelling unit.

Homes with Two or Three Apartments

  1. A hardwired smoke detector with a battery backup must be located in the corridor or hallway outside of sleeping areas and on every level of the dwelling unit including the basement. The basement smoke detector must be interconnected to the smoke detector on the first floor only.

Homes with Four to Six Apartments

  1. A hardwired interconnected smoke detector with a battery backup must be located in the corridor or hallway outside the sleeping area and on every level of the dwelling unit.
  2. A hardwired smoke detector is required in the basement for homes with four to six apartments but does not have to be interconnected.

On March 8, 2016, the House of Delegates, State of Maryland, adopted House Bill 849 requiring all rental dwelling units, on or after April 1, 2018, to have a carbon monoxide alarm installed within the dwelling on every level of the unit, including the basement. In addition to being present on every level, they must be audible in sleeping areas.

 
Revised March 15, 2018         

 

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