Smoke and Carbon Monoxide Detectors: Your Landlord’s Legal Obligations

California Tenant Defense System | Justice Foundation

California law imposes specific requirements on landlords regarding smoke and carbon monoxide detectors — requirements that affect both your safety and your legal rights as a tenant. A landlord who fails to install and maintain required detectors has violated state law, creating both a code enforcement complaint opportunity and potentially a habitability defense if the failure is part of a broader pattern of neglect.

Smoke Detector Requirements

California Health and Safety Code Section 13113.7 requires smoke detectors in all residential dwellings. For single-family homes and multi-family units, detectors must be installed in each bedroom, outside each sleeping area, and on each level of the dwelling including the basement. Landlords must install approved detectors before a new tenant occupies a unit and must test and maintain them in working order. Detectors in rental units must be capable of being heard in sleeping areas with all doors closed.

Carbon Monoxide Detector Requirements

California Health and Safety Code Section 17926 requires carbon monoxide detectors in all residential units that have a fossil fuel burning appliance (gas stove, gas furnace, gas water heater), a fireplace, or an attached garage. CO detectors must be installed outside each sleeping area in the vicinity of bedrooms and on each level of the dwelling. Landlords are responsible for installing CO detectors before a new tenancy begins.

What to Do When Detectors Are Missing or Non-Functional

If your unit lacks required smoke or CO detectors, or if the existing detectors don’t work, notify your landlord in writing immediately and request installation or replacement. If the landlord doesn’t respond within a reasonable time, file a code enforcement complaint — missing or non-functional detectors are a per se code violation. The landlord’s failure to install required safety equipment is also a habitability issue that supports rent withholding if it continues after proper notice. The Justice Foundation kit includes notification letter templates and code enforcement complaint forms for detector violations.