CO alarms are required in all newly constructed one and two-family dwellings and town homes not more than three stories. Effective date: January 2010 CO alarms are required in all newly constructed and existing multi-unit dwellings and single-family rental properties. Effective date:  July 1, 2018

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Required smoke alarms must be dual-sensor. Both dual-sensor (photoelectric and ionization) smoke alarms and combination smoke and carbon monoxide alarms comply with this requirement. Effective date: April 2010

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Smoke alarms are generally required in residential settings. Hard-wired smoke alarms are required in all new construction.

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