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    Plumbing Code Adoption

    Hawaii Plumbing Code: Uniform Plumbing Code 2018

    Hawaii follows Uniform Plumbing Code 2018 as the basis for plumbing work. Permits and inspections are issued by the local Authority Having Jurisdiction (AHJ), which may publish additional amendments.

    Adoption details

    Model code family
    IPC / UPC
    Adopted edition
    Uniform Plumbing Code 2018
    Last verified
    2026-05-29

    Related resources for Hawaii

    Frequently Asked Questions

    What plumbing code does Hawaii use?

    Hawaii currently follows Uniform Plumbing Code 2018 for plumbing 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 plumbing work in Hawaii?

    Most plumbing work in Hawaii — 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 Hawaii plumbing 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 Uniform Plumbing Code 2018 text is published by its model-code body (ICC, IAPMO, or NFPA depending on the trade).

    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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