Ann Arbor, MI Building Safety: Carbon Monoxide Detectors (2026)
Key Facts
- Minimum detectors
- 1 per story + near bedrooms
- Triggers rule
- fuel-fired appliance or attached garage
- Standard
- UL listed
- Disabling penalty
- misdemeanor, up to 90 days
Summary
Ann Arbor requires a working carbon monoxide detector on every story of single- and two-family rentals with a fuel-fired appliance or attached garage, plus one outside each sleeping area, regardless of age.
Carbon monoxide detectors, in single and 2-family dwellings that contain a fuel-fired appliance or have an attached garage with a common door, regardless of the year the dwelling was constructed. In each individual dwelling unit, there shall be a minimum of 1 detector on each story and there shall be a detector installed outside of each separate sleeping area in the immediate vicinity of the bedrooms. All detectors shall be UL listed. Multiple-dwellings shall comply with the carbon monoxide detection requirements contained in the International Fire Code as set forth in Chapter 111, regardless of the year the dwelling was constructed. All detectors shall be UL listed.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 26 Update 4).
Full Breakdown
Landlords may not let a single- or 2-family dwelling containing a fuel-fired appliance, or with an attached garage sharing a common door, unless it has UL-listed carbon monoxide detectors: a minimum of one per story, plus one outside each separate sleeping area near the bedrooms, regardless of when the building was constructed. Multi-family dwellings instead follow the International Fire Code's carbon monoxide standards. The owner must keep detectors working and battery-stocked; tenants must report a failed unit, and detectors are tested at every change of tenant.
Violations & Fines
Missing or inoperable required detectors: civil infraction, fine up to $500. Willfully disabling a smoke, fire, or carbon monoxide detector: misdemeanor, up to 90 days in jail and/or a $500 fine.
Frequently Asked Questions
Does Ann Arbor require carbon monoxide detectors in rental units?
Who has to keep the detectors working?
Sources & Official References
Other rules in Ann Arbor
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