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    Mechanical / HVAC Code Adoption

    Arizona Mechanical / HVAC Code: IMC 2018

    Arizona follows IMC 2018 as the basis for mechanical / hvac work. Permits and inspections are issued by the local Authority Having Jurisdiction (AHJ), which may publish additional amendments.

    Adoption details

    Model code family
    IMC / UMC
    Adopted edition
    IMC 2018
    Last verified
    2026-05-29

    Note: No statewide plumbing code — adoption is local. Many jurisdictions use the IPC; verify with the AHJ. (Mechanical code typically derives from the plumbing-code family.)

    Related resources for Arizona

    Frequently Asked Questions

    What mechanical / hvac code does Arizona use?

    Arizona currently follows IMC 2018 for mechanical / hvac work. Always confirm the in-force edition with the local Authority Having Jurisdiction (AHJ) — county or city amendments can apply.

    Do I need a permit for mechanical / hvac work in Arizona?

    Most mechanical / hvac work in Arizona — including new installations, system replacement, and gas-fueled appliance hookups — requires a permit from the local building department and an inspection at completion. Homeowner permits are typically allowed for owner-occupied residences; commercial work requires a licensed contractor.

    Where do I check Arizona mechanical / hvac code amendments?

    Local jurisdictions (city or county) often publish amendments on the state's building-codes board website or in the municipal code. The current IMC 2018 text is published by its model-code body (ICC, IAPMO, or NFPA depending on the trade).

    Are there any unusual mechanical / hvac requirements in Arizona?

    No statewide plumbing code — adoption is local. Many jurisdictions use the IPC; verify with the AHJ. (Mechanical code typically derives from the plumbing-code family.)

    Reference guidance only — adoption editions and local amendments vary by city or county. Always confirm requirements with your local Authority Having Jurisdiction (AHJ) before designing, permitting, or constructing.

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