Plumbing and HVAC rules in Iowa
What the state says about plumbing and heating and cooling work, with the page each rule comes from. It's a summary of the published rules, not legal advice, and your city or county can have rules of its own.
Checked September 23, 2026
Plumbing licensing
In Iowa, a plumbing business needs a plumbing contractor license backed by a master license holder, plus state contractor registration. Plumbers hold master, journeyperson or apprentice licenses from the Plumbing and Mechanical Systems Board.1, 2, 3
Heating and cooling licensing
Iowa's Plumbing and Mechanical Systems Board also licenses the mechanical trades, including HVAC, refrigeration, hydronics and sheet metal, with contractor, master, journey and HVAC specialty licenses, and contractors register with the state.4
Plumbing and mechanical codes
Iowa's state plumbing code is the 2024 Uniform Plumbing Code with amendments.5 The Iowa Mechanical Code is the 2024 International Mechanical Code with amendments.5
Permits to replace a water heater, furnace or AC
Ask your local building department whether replacing a water heater, furnace or AC needs a permit where you live.
Backflow testing
If your home has a backflow preventer, your water utility can tell you whether it needs testing and who can test it.
Sources
What plumbing and HVAC work costs in Iowa
Published national ranges for plumbing, water heater, sewer, AC, heat pump and furnace jobs, and a planning estimate for your own job.
Contractors in Iowa
1,466 plumbers and heating and cooling contractors are listed in Iowa. 101 hold an active USDOT registration. Browse them by county, or ask for quotes and we'll pass your job to contractors near you.
Cite this page
“Plumbing and HVAC rules in Iowa.” PlumbingInformationSite.com, updated September 27, 2026. https://plumbinginformationsite.com/ia/rules/