Working alarms are one of the cheapest life-safety upgrades in any home. California has a few rules of its own worth knowing.
Where should smoke alarms go?
In general: in each bedroom, outside each sleeping area, and on every level including basements. Newer homes have hardwired alarms with battery backup that are interconnected, so when one sounds they all sound.
What are California's smoke alarm battery rules?
California requires battery-only smoke alarms sold in the state to have a sealed, non-replaceable battery designed to last at least 10 years. Hardwired alarms have backup batteries. Most smoke alarms should be replaced about every 10 years; check the date on the back.
Do I need carbon monoxide alarms in California?
California generally requires CO alarms in homes that have a fuel-burning appliance (gas furnace, water heater, range, dryer or fireplace) or an attached garage, typically outside sleeping areas and on each level. Combination smoke/CO alarms are an easy way to cover both.
When do alarms have to be updated?
Permitted remodels and additions usually trigger bringing smoke and CO alarms up to current requirements, and sellers must disclose alarm compliance when a home is sold. Your building department sets the exact trigger for your project.
How do I maintain alarms?
- Press the test button monthly.
- Replace alarms at the end of their life (often 10 years for smoke, 7 to 10 for CO; check the label).
- Never remove a chirping alarm without replacing it.
Common questions
Are carbon monoxide detectors required in California?
Yes, generally in homes with fuel-burning appliances, a fireplace or an attached garage, placed outside sleeping areas and on each level.
Do smoke detectors need a 10-year battery in California?
Battery-only smoke alarms sold in California must have a sealed battery designed to last at least 10 years. Hardwired alarms with battery backup are also common.
General information for California homes under the California Electrical Code (based on the NEC). Local rules and inspectors can vary. Not a substitute for an on-site inspection. Never work inside a panel, at the meter or on live circuits.