Arizona law requires an approved smoke detector installed during construction in every new residential unit. Pinal County enforces smoke- and carbon-monoxide-alarm placement through the building code (IRC) it has adopted; landlords must keep them operational at move-in.
A.R.S. 36-1637 mandates that an approved smoke detector be installed during construction in each new residential housing unit statewide. For placement and additional alarms, Pinal County applies the International Residential Code (IRC R314/R315) it has adopted, which requires smoke alarms in each sleeping room, outside each sleeping area, and on every level, plus carbon-monoxide alarms where fuel-burning appliances or an attached garage exist. In rentals, the landlord must ensure detectors are present and operational at the start of tenancy. Cities within the county (Casa Grande, Maricopa, Apache Junction) enforce their own adopted codes.
Missing or non-functioning required alarms can be a building-code violation and, for rentals, a habitability failure the landlord must correct.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Pinal County's smoke detectors rules stack up against other locations.
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