Modesto, CA Fire Regulations: Smoke Detectors (2026)

There is no special Stanislaus County smoke-detector ordinance; requirements flow from California statute and the building/residential code the county has adopted. Under California Health & Safety Code Section 13113.7, smoke alarms are required in all dwelling units, and Section 17926 requires carbon monoxide alarms in dwelling units with a fuel-burning appliance, fireplace or attached garage. For property transfers, state law requires at least one carbon monoxide device approved and listed by the State Fire Marshal to be installed at the point of sale of residential property. The 2022 California Residential Code (CRC), adopted by California jurisdictions including the county, requires smoke alarms and carbon monoxide alarms throughout dwelling units for new construction and for alterations, repairs or additions. Under the CRC, smoke alarms in new and substantially modified construction must receive primary power from the building wiring (with battery backup) and be interconnected, and combination smoke/CO alarms may be used in lieu of separate smoke alarms. Carbon monoxide detectors are required in dwelling units and in sleeping units that contain fuel-burning appliances or that are in buildings with attached garages. Landlords and home sellers in the unincorporated county should confirm working alarms are present before transfer or new tenancy.