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

Like all California jurisdictions, unincorporated Nevada County applies statewide smoke alarm law rather than a unique county rule. California Health and Safety Code section 13113.7 requires an approved smoke alarm in every dwelling unit intended for human occupancy - single-family homes, duplexes, apartments, condominiums, hotels, motels, and lodging houses. Consistent with the California Residential Code adopted for new construction, alarms must be installed inside each bedroom, in the hallway or area immediately outside each sleeping area, and on every story of the home, including basements and habitable attics. Landlords are responsible for installing and maintaining alarms in rental units, and since 2014 that duty extends to owners of rented single-family homes. Separately, California Health and Safety Code section 17926 requires a carbon monoxide alarm in every dwelling that has a fossil-fuel-burning appliance, a fireplace, or an attached garage; for single-family homes the deadline was July 1, 2011, and for most other existing dwellings January 1, 2013. Both smoke and CO alarms must be approved/listed by the State Fire Marshal and placed per building standards or the manufacturer's instructions. New construction and remodels in fire-prone unincorporated areas are also subject to the California Building Code (including Chapter 7A wildland-urban-interface material standards) enforced by county building officials.