No statewide building code for private construction; counties (optional, A.R.S. 11-861) and cities adopt their own codes locally. Enforced by City/town and county building officials; no state building-code agency for private buildings. Checked on the primary source; the state record was last reviewed 2026-11-12.
Counties with zoning may adopt building, electrical, plumbing and mechanical codes for unincorporated zoned areas, from a national code body or the county's largest city (city changes adopted within 90 days). County fire codes must be at least as stringent as the state fire code. State-owned buildings are exempt from local building codes (A.R.S. 34-461, not re-read).
Source: primary document
Statewide layer. County and city amendments sit on top; confirm the local office for the address.
In force; A.R.S. 11-861 re-read Oct 19, 2026 (county codes; fire codes at least as stringent as the state code; county refrigerant preemption)
These apply when the building has the equipment or fits the type named. The frequency is the standard one; your local official can set a stricter one, so confirm it for the address.
No statewide building code for private construction; counties (optional, A.R.S. 11-861) and cities adopt their own codes locally. Counties with zoning may adopt building, electrical, plumbing and mechanical codes for unincorporated zoned areas, from a national code body or the county's largest city (city changes adopted within 90 days). County fire codes must be at least as stringent as the state fire code. State-owned buildings are exempt from local building codes (A.R.S. 34-461, not re-read).
City/town and county building officials; no state building-code agency for private buildings.
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
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