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

Placer County does not maintain a separate alarm ordinance; instead, smoke and carbon monoxide alarm rules come from California state law as enforced through the California Building/Residential Codes and the State Fire Marshal. Under California Health & Safety Code Section 13113.8, smoke alarms must be installed in each bedroom, outside each separate sleeping area, and on every level of the dwelling, including basements. Under the Carbon Monoxide Poisoning Prevention Act of 2010 (Health & Safety Code Section 17926 and following), the owner of any dwelling unit intended for human occupancy must install a State Fire Marshal-approved carbon monoxide device in each unit that has a fossil-fuel-burning heater or appliance, a fireplace, or an attached garage. Landlords must install and ensure alarms are operable at the start of each tenancy and must maintain and test devices, while tenants are generally responsible for notifying the owner of malfunctions. These devices are also typically required to be installed or upgraded at point of sale and when permits are pulled for additions or alterations. CAL FIRE and local fire agencies strongly recommend alarms in wildfire-prone areas given the prevalence of wood stoves and propane appliances.