In unincorporated Ventura County, smoke and carbon monoxide alarms are required under the Ventura County Building Code, which adopts California Residential Code §R314 and §R315. When work on a dwelling exceeds $1,000 in value, alarms must be brought up to code in each bedroom, outside sleeping areas, and on every level. CO alarms apply where fuel-burning appliances or attached garages exist.
Ventura County's Division of Building and Safety enforces the Ventura County Building Code in unincorporated areas, adopting the California Residential Code. Under Sections R314 and R315, when the valuation of additions, alterations, or repairs to an existing dwelling unit exceeds $1,000, smoke alarms and/or carbon monoxide alarms must be installed to current standards. Smoke alarms are required outside each separate sleeping area in the immediate vicinity of the bedrooms (and, per the Residential Code, in each bedroom and on each story of the dwelling). Carbon monoxide alarms are required where a dwelling contains fuel-burning appliances (or an attached garage) and are not required in dwellings that contain no fuel-burning appliances. For power supply, in dwelling units with no commercial power supply the alarms may be solely battery-operated; in existing dwelling units, alarms are permitted to be solely battery-operated where the work does not involve removing interior wall or ceiling finishes that would expose wiring (otherwise hard-wired, interconnected alarms are required). These requirements also intersect with California Health & Safety Code §13113.7 (smoke detectors) and §17926 (CO alarms), which mandate working smoke and CO alarms in dwelling units statewide. The county's Smoke/Carbon Monoxide Alarm Affidavit (Form B-102) documents compliance at permit final.
Smoke and CO alarm compliance is verified during building permit inspections; failure to install required alarms can result in a failed inspection and refusal to finalize a permit. Beyond permitted work, California law (HSC §13113.7 and §17926) independently requires working smoke and CO alarms in dwellings, and landlords are responsible for installation and maintenance. Confirm specific requirements with the Ventura County Division of Building and Safety.
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