Plumbing and HVAC rules in Louisiana

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

Plumbers in Louisiana hold master, journeyman or residential licenses from the State Plumbing Board, which moves into the State Licensing Board for Contractors on January 1, 2027. Commercial plumbing work over $10,000 also needs a contractor license with a plumbing subclassification from the State Licensing Board for Contractors.1, 2, 3

Heating and cooling licensing

In Louisiana, air conditioning, refrigeration and heating work with a project value of $10,000 or more needs a Mechanical license from the State Licensing Board for Contractors.4

Plumbing and mechanical codes

Louisiana's State Uniform Construction Code includes the 2021 International Plumbing Code with amendments.5 The same code includes the 2021 International Mechanical Code.6

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

  1. State Plumbing Board of Louisiana ↑
  2. State Plumbing Board of Louisiana ↑
  3. Louisiana State Legislature ↑
  4. Louisiana State Licensing Board for Contractors ↑
  5. Louisiana Division of Administration ↑
  6. Louisiana Division of Administration ↑

What plumbing and HVAC work costs in Louisiana

Published national ranges for plumbing, water heater, sewer, AC, heat pump and furnace jobs, and a planning estimate for your own job.

Plumbing, heating and cooling costs in Louisiana

Contractors in Louisiana

44 plumbers and heating and cooling contractors are listed in Louisiana. 23 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 Louisiana.” PlumbingInformationSite.com, updated September 27, 2026. https://plumbinginformationsite.com/la/rules/