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 the fossil-fuel appliance or heater. The law also requires owners of multi-family dwellings to install CO alarms in the vicinity of bedrooms and the fossil fuel appliance or heater.

Effective date: June 2015


CO alarms are required in all new and existing one- and two-family homes.

Effective: January 2009