Smoke and carbon-monoxide alarm rules come from the Michigan Residential Code and state law, not a county ordinance. Homes need smoke alarms on every level and in each sleeping area; CO alarms are required near bedrooms where fuel appliances or an attached garage exist.
There is no Washtenaw County smoke-detector ordinance; requirements flow from the Michigan Residential Code and MCL 125.1504f, enforced by local building departments. Smoke alarms must be installed in each sleeping room, outside each sleeping area, and on every story including basements. Carbon-monoxide alarms are required near sleeping areas in dwellings with fuel-burning appliances or an attached garage, at initial construction, permitted renovation, or when a bedroom is added. CO devices may be battery, plug-in with battery backup, hardwired, or panel-connected. Landlords must install and maintain working smoke and CO alarms in rental units as a condition of occupancy.
Missing or non-working alarms are building- and rental-code violations; a landlord's failure to provide them can block a certificate of occupancy and trigger municipal penalties.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Washtenaw County's smoke detectors rules stack up against other locations.
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