CO alarms are required in all newly constructed one- and two-family dwellings and town homes not more than three stories. Effective date: November 2006 CO alarms are widely required in all new and existing dwellings. Effective date: January 2011

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Smoke alarms are generally required in residential settings. Hard-wired smoke alarms are required in all new construction in local jurisdictions that have adopted IRC 2015.

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