CO alarms are required outside of each separate sleeping area in the immediate vicinity of the bedrooms in all newly constructed one and two-family dwellings and town homes not more than three stories.

Effective date: January 2017

Chapter Number 349 requires the installation of hardwired, interconnected CO alarms in each sleeping area and in any room with a CO source or adjacent to an attached garage. Compliance with this requirement will be phased in, with new properties having to comply immediately (July 2018). Properties currently under construction would have until December 31, 2019, to comply, while existing properties must comply by December 31, 2020.


CO alarms are required in all residential dwellings and mixed-use occupancies.