- The current California Building Code and a recent California Senate Bill, SB183 require listed carbon monoxide alarms to be installed in residential occupancies in which fuel-burning appliances are installed, and in dwelling units that have attached garages as outlined below.
- All existing one and two family dwellings meeting the criteria in item 1 above are required to have carbon monoxide alarms installed by July 1, 2011.
- Other existing residential buildings must be provided with carbon monoxide alarms in which fuel-burning appliances are installed, and in dwelling units that have attached garages when alterations, repairs, or additions requiring a building permit exceed one thousand dollars ($1,000) are done.
- Existing residential buildings with 3 units or more that meet the criteria in item 1 above are required to have carbon monoxide alarms installed by January 1, 2013.
- For new construction, CO alarms must be hard-wired and interconnected.
- CO alarms in existing buildings may be solely battery operated when repairs or alterations do not result in the removal of wall and ceiling finishes or there is no access by means of attic, basement or crawl space.
- CO alarms are required to be installed in the following locations:
- Outside of each sleeping room in the immediate vicinity of the sleeping room.
- On every level of a dwelling unit, including basements.
- In tourist hotels and motels only, on the ceiling of sleeping rooms with permanently installed fuel-burning appliances.
- Multi-purpose alarms: CO alarms combined with smoke alarms shall be listed, meet the UL 2034 standard, and be California State Fire Marshal listed for smoke alarms.
- Please read the manufacturer’s instructions thoroughly and keep them as a reference. Carbon monoxide alarms have a limited lifespan and it varies by device.
For more information about Carbon Monoxide, please see the following:
Carbon Monoxide Facts
Carbon Monoxide Facts (PDF)
Carbon Monoxide Poisoning Prevention