Arizona mechanical, plumbing, fuel gas & energy codes
Arizona has no statewide building, mechanical or plumbing code. Cities and counties adopt their own, mostly I-Codes. State law bars local codes from prohibiting EPA-approved refrigerants.
Quick answer: Arizona has no statewide mechanical, plumbing or fuel gas code. Each city or county adopts its own, so check the local building department. A2L status: Allowed: state law bars local refrigerant bans
Adopted codes
Mechanical
No statewide code
Local adoption
- Adopted as
- No statewide mechanical code
- Effective
- n/a
- Source
- ICC – Arizona adoptions
- Last checked
- 2026-10-29 verified
- Notes
- Codes are adopted locally, mostly I-Codes.
Plumbing
No statewide code
Local adoption
- Adopted as
- No statewide plumbing code
- Effective
- n/a
- Source
- ICC – Arizona adoptions
- Last checked
- 2026-10-29 verified
- Notes
- Local choice. Some cities use the IPC and others the UPC.
Fuel Gas
No statewide code
Local adoption
- Adopted as
- No statewide fuel gas code
- Effective
- n/a
- Source
- ICC – Arizona adoptions
- Last checked
- 2026-10-29 verified
- Notes
- Local choice.
Energy
Residential: Home rule; Commercial: Home rule
Local adoption
- Adopted as
- Home rule (no statewide energy code)
- Effective
- n/a
- Source
- U.S. DOE Building Energy Codes Program – Arizona
- Last checked
- 2026-10-29 verified
- Notes
- Enforcement is jurisdictional.
A2L refrigerants in Arizona
A.R.S. §9-810.01 (cities) and §11-861(J) (counties) bar local codes from prohibiting refrigerants listed as acceptable under the Clean Air Act, as long as the equipment is listed and installed under the federal use conditions. Local mechanical codes still set the installation rules.
Source: https://www.azleg.gov/ars/9/00810-01.htm · Last checked 2026-10-29 verified
Local amendments & things to watch
- Phoenix: the 2024 Phoenix Building Construction Code took effect Aug 1, 2025. It includes the 2024 IMC, IFGC, IPC and IECC with Phoenix amendments. verified source
- Tucson: the 2024 IMC and IPC were reported effective Jan 1, 2026, applying to permit applications received from July 1, 2026. We couldn't open the city page to confirm. unverified source
- The State Fire Marshal enforces the State Fire Code (2018 IFC) for state and county buildings and schools, and for most occupancies in areas with no local fire code. verified source