Carbon Monoxide Detector Requirements for Oregon Hotels and Short-Term Rentals

Oregon's carbon monoxide alarm requirements for hotels and short-term rentals arise from two parallel legal tracks. For hotels and Group R occupancies, ORS 455.360 and Oregon Fire Code (OFC) Sections 908.7 and 1103.9 require CO detection in new construction and in existing buildings where fuel-burning equipment is present. For short-term rental operators and residential landlords, ORS 476.725 and implementing rules under OAR 837, Division 47 require a properly functioning CO alarm before any new tenant takes possession of a dwelling unit containing a carbon monoxide source.

Both tracks operate under a unified statewide framework. ORS 476.725(4) explicitly bars every city and county in Oregon from enacting or enforcing local ordinances on CO alarm design, inspection, testing, maintenance, placement, or location. This statewide preemption means no Oregon municipality can impose stricter CO alarm requirements on hotels or STRs beyond the state baseline, making Oregon's framework notably uniform compared to most other states.

Oregon's CO alarm law covers two distinct categories. Hotels, motels, and all buildings classified as Group R occupancies under the Oregon structural specialty code are subject to ORS 455.360 (new construction and permitted alterations) and OFC Sections 908.7 and 1103.9 (existing buildings with fuel-burning appliances, fireplaces, or attached garages). Short-term rental operators and residential landlords whose units are subject to ORS Chapter 90 are covered by OAR 837-047-0160: before transferring possession to any new tenant, the landlord must install a properly functioning CO alarm if the unit contains a carbon monoxide source. Hotels and motels are excluded from ORS Chapter 90 by statute, so the residential landlord pathway applies to STR hosts but not to traditional hotels.

Hotel operators bear CO alarm obligations under both the Oregon building code and Oregon Fire Code. Under ORS 455.360, any hotel built as new construction or undergoing reconstruction, alteration, or repair requiring a building permit must be equipped with CO alarms per the structural specialty code. Under OFC Section 908.7.2, existing hotels must have monitored CO detection, not merely standalone alarms, in all areas containing fuel-fired appliances, including boiler rooms, laundry facilities, generator rooms, commercial kitchens, and rooms with fireplaces. This monitored-detection requirement applies to existing hotel buildings and is not limited to new construction.

STR operators and residential landlords must comply with OAR 837-047-0160. Effective July 1, 2010, before transferring possession to a new tenant, the landlord must install a properly functioning CO alarm, provide working batteries if the alarm is battery-operated, and give the tenant written alarm testing instructions. By April 1, 2011, every rental dwelling unit subject to ORS Chapter 90 that contains a CO source was required to have properly functioning CO alarms in place. If a tenant notifies the landlord in writing of a CO alarm deficiency other than dead batteries, the landlord must repair or replace the alarm. Tenant responsibility is limited to testing alarms at least every six months and replacing batteries as needed.

All operators must verify that installed devices comply with ANSI/UL 2034 (standalone alarms) or ANSI/UL 2075 (detectors in monitored systems) as required under OAR 837-047-0110 and OFC 908.7.

Under OAR 837-047-0130, CO alarms in dwellings and multifamily housing must be placed within each bedroom or within 15 feet outside each bedroom door. Bedrooms on separate floors require separate alarms on each story. In units connected to a common area containing a CO source, alarms must be located within each bedroom or within 15 feet of each bedroom door.

For hotels under OFC Section 1103.9, CO alarms must be installed in each sleeping unit that contains a fuel-burning appliance, fireplace, or attached garage, or that is connected by ductwork or ventilation shafts to a fuel-burning area. OFC Section 908.7.2 additionally requires monitored CO detection in all fuel-burning equipment rooms throughout the hotel building. Single-station alarms must comply with ANSI/UL 2034; detection systems using detectors and audible notification appliances installed per NFPA 720 are permitted, with detectors listed to ANSI/UL 2075.

The Oregon State Fire Marshal enforces ORS 476.725 and OAR 837, Division 47 statewide. For hotel buildings and Group R occupancies, local building departments enforce ORS 455.360 through the permit and inspection process. The State Fire Marshal's Office also enforces the Oregon Fire Code, including OFC 908.7 hotel requirements, in jurisdictions without local fire code enforcement programs. Local fire marshals enforce the OFC where a jurisdiction has assumed local enforcement authority. Enforcement of residential landlord CO alarm obligations under ORS Chapter 90 may also be pursued through tenant civil remedies under ORS 90.320, which can support rent withholding or lease termination without involvement of a government enforcement agency.

Under ORS 105.840, a buyer or transferee of a dwelling containing a CO source that lacks compliant alarms may bring a civil action to recover the greater of actual damages or $250 per residential unit; courts may also award reasonable attorney fees. STR landlords who fail to maintain required CO alarms face habitability claims under ORS 90.320, which can support rent withholding or lease termination. Hotel building code violations under ORS 455.360 are subject to civil penalties by local building departments, and OFC violations may result in correction orders and civil fines.