Lake County, CA Fire Regulations: Smoke Detectors (2026)

Smoke- and carbon-monoxide-alarm requirements in unincorporated Lake County are set by California law rather than a local ordinance. California Health and Safety Code Section 13113.7 requires smoke alarms in all dwelling units intended for human occupancy, including single-family homes and rental units. Owners must ensure alarms are operable at the start of a new tenancy; tenants must notify the owner of an inoperable alarm. New alarms must be approved by the State Fire Marshal for sale in California, and battery-operated alarms are permitted where they meet current building standards. For single-family homes and factory-built housing, an operable smoke alarm must be present at the time of sale. Carbon-monoxide protection is required under Health and Safety Code Section 17926: since 2011, all dwellings with a fuel-burning appliance, a fireplace, or an attached garage must have a carbon-monoxide alarm. The California Residential Code (adopted by Lake County through its Building Regulations) specifies placement—alarms in each sleeping room, outside each sleeping area, and on every level. A violation of the smoke-alarm requirement under HSC 13113.7 is an infraction punishable by a fine of up to $200 per offense. Because Lake County is a very-high fire hazard area, maintaining working alarms is especially important.