Smoke and carbon monoxide alarm requirements in unincorporated Sonoma County follow the California Residential Code as adopted through the County's building and fire codes, plus statewide point-of-sale law. Residential permits over $1,000 in valuation trigger alarm upgrades throughout the dwelling, and at least one CO device must be installed when residential property is sold.
Sonoma County does not set a unique smoke-alarm distance rule; instead it enforces the California Residential Code and California Fire Code, which the County adopts with local amendments through Chapter 7 (building) and Chapter 13 (fire) of the Sonoma County Code. Permit Sonoma's building requirements state that residential permits exceeding $1,000 in valuation require smoke and carbon monoxide detectors to be installed throughout the residence, consistent with the California Residential Code in effect.
Under California law (Health and Safety Code sections 13113.7 and 17926), smoke alarms are required in every bedroom, outside each sleeping area, and on every level of a dwelling. Carbon monoxide alarms are required in dwelling units that have a fossil-fuel-burning appliance, a fireplace, or an 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 point of sale, and smoke alarms must meet current standards. Homes built or substantially remodeled after 1992 generally require hardwired, interconnected alarms, while older homes may use battery units.
Because the County adopts the statewide codes by reference, the operative requirements are those of the current California Residential and Fire Codes plus state point-of-sale statutes - the County layer is primarily enforcement through the building-permit and resale process rather than a separate local distance ordinance.
Failing to install required smoke and CO alarms can block permit final inspections for residential work over $1,000 and creates liability at point of sale, where state law requires at least one State Fire Marshal-listed CO device. Requirements derive from the California Residential/Fire Codes adopted by Sonoma County and statewide HSC sections 13113.7/17926.
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