Boulder County has no separate smoke-alarm ordinance; the requirement is set by Colorado state law and the adopted building code. A carbon monoxide alarm must be installed within 15 feet of each bedroom in dwellings with a fuel-fired appliance, fireplace, or attached garage on sale, permitted work, or new rental
Under CRS 38-45-102, the seller of an existing single-family dwelling with a fuel-fired heater, fireplace, or attached garage must ensure an operational carbon monoxide alarm is installed within fifteen feet of the entrance to each sleeping room. The same requirement applies when permitted interior alterations or additions occur, and CRS 38-45-104 extends it to rentals at each change of tenancy. Smoke alarms are required by the county-adopted 2021 International Residential/Fire Code for new construction and permitted work. This is a statewide framework, not a distinct Boulder County rule.
Enforced through the building-permit and real-estate transfer process rather than direct fines; noncompliance can block permit sign-off or transfer.
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