Plumbing and HVAC rules in Ohio

Ohio's Construction Industry Licensing Board licenses plumbing contractors for commercial work, and licensing for residential plumbing is local.^{1, 2, 3}

Ohio's Construction Industry Licensing Board issues an HVAC contractor license. For work on a home, ask your city or county which license applies.^{1, 2, 3}

Ohio's plumbing code, based on the 2021 International Plumbing Code and in effect since March 1, 2024, covers buildings under the Ohio commercial code.⁴ The Ohio Mechanical Code, based on the 2021 International Mechanical Code, covers the same buildings from the same date.⁵

Ask your local building department whether replacing a water heater, furnace or AC needs a permit where you live.

If your home has a backflow preventer, your water utility can tell you whether it needs testing and who can test it.