Flagstaff, AZ Building Safety: Carbon Monoxide Detectors (2026)

Flagstaff added the carbon monoxide rule as part of a public-safety overhaul of Title 3, Chapter 3-12 (Short-Term Rentals), enacted by Ordinance 2026-11 on May 19, 2026. Section 3-12-001-0013.B requires a CO detector in any STR containing a fuel-burning appliance, fuel-burning fireplace, or an attached garage, covering natural gas, propane, and wood-burning equipment. Detectors must sit outside each separate sleeping area near bedrooms and inside every sleeping unit itself, and the owner has to keep them tested and operable at all times, not just at move-in.

The same section also requires battery-backup smoke alarms in every sleeping room, on the ceiling or wall outside sleeping areas, and on every story including basements; a 2-A:10-B:C rated fire extinguisher that is mounted, visible, and inspected at least annually; and two unobstructed means of egress kept clear of furniture, storage, and winter snow and ice. Community Development licenses and inspects STRs, and the City Management Services Director administers the STR public-safety program citywide. A missing or dead CO detector is not a paperwork issue: it is a life-safety violation the City can verify and count against the property's license.

Because Flagstaff sits at 7,000 feet with a long heating season, fuel-burning furnaces, wood stoves, and attached garages are common in STR housing stock, which is exactly the equipment this section targets. Owners who rely on a booking platform's own safety checklist are not excused; the City's own ordinance controls for licensing purposes regardless of what a listing site requires.