Portland, OR Building Safety: Carbon Monoxide Detectors (2026)

A. Existing rental dwelling units must have one or more carbon monoxide (CO) alarm(s) installed in compliance with state Fire Marshal rules and the state building code and maintained per the Oregon Revised Statutes 90.317, if the rental dwelling unit:

1. Contains a carbon monoxide source; or

2. Is located within a structure that contains a carbon monoxide source and the dwelling unit is connected to the room in which the carbon monoxide source is located by a door, ductwork, or a ventilation shaft.

B. All existing dwelling units, including rental dwelling units, must have a carbon monoxide (CO) alarm(s) installed in compliance with the current Oregon Residential Specialty Code Section R315, only:

1. At such time as a carbon monoxide source is introduced; or

2. When interior work requiring a structural permit occurs.

C. All detectors or alarms installed must be approved, properly functioning, and installed in accordance with the manufacturer’s instructions.

D. In accordance with state building code, all carbon monoxide detectors or alarm(s) required to be installed per this section must be located as follows:

1. In each bedroom or within 15 feet outside of each bedroom door;

2. For bedrooms on separate floor levels in a structure with two or more stories, each story must have separate carbon monoxide alarms; and

3. Where a fuel-burning appliance is located within a bedroom or its attached bathroom, a carbon monoxide alarm must be installed within the bedroom.