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    Plumbing Code Adoption

    New Hampshire Plumbing Code: International Plumbing Code 2021

    New Hampshire follows International Plumbing Code 2021 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
    International Plumbing Code 2021
    Last verified
    2026-05-29

    Related resources for New Hampshire

    Frequently Asked Questions

    What plumbing code does New Hampshire use?

    New Hampshire currently follows International Plumbing Code 2021 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 New Hampshire?

    Most plumbing work in New Hampshire — 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 New Hampshire 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 International Plumbing Code 2021 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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