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 Pennsylvania homeowners, upon the sale of their home, are required to disclose to the buyer if the structure is equipped with a CO alarm in the vicinity of each bedroom and…

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Philadelphia: Local law requires that solely battery-powered smoke alarms feature 10-year sealed batteries. One- and two-family dwellings built on or after January 1, 1988, and apartment dwelling units are not affected, as those dwellings are required to have hard-wired smoke alarms. Effective date: January 2013

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