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

Sierra County has not enacted a separate smoke-detector ordinance, but Sierra County Code Section 12.04.080 adopts the California Building Standards Code (Title 24), including the California Building Code, California Residential Code, and California Fire Code, all of which contain smoke- and carbon-monoxide-alarm requirements. The underlying statewide statute, California Health and Safety Code Section 13113.7, requires smoke alarms in all dwelling units intended for human occupancy. Smoke alarms must be installed in each sleeping room (bedroom), in the hallway or area adjacent to each sleeping area, and on every story of the dwelling, including basements. Battery-powered smoke alarms newly installed must use a 10-year sealed battery. Carbon monoxide alarms are required in dwelling units that have a fuel-burning appliance, fireplace, or an attached garage — installed in the hallway adjacent to sleeping areas and on each level. These requirements apply when building, when selling or transferring a home, and as an ongoing maintenance duty for owners and landlords. New construction and additions in unincorporated Sierra County must meet the alarm provisions of the adopted California Residential/Building Code as verified during permit inspections. Because the county is high wildfire-risk, working alarms are especially important; landlords are responsible for installing alarms and tenants for notifying landlords of defects.