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Indiana plumbing: state licenses and owner exemptions

Source: Local Help Stations (localhelpstations.com). Last updated November 2, 2026.

Indiana plumbing rules here come from IC 25-28.5 and the Indiana Plumbing Commission pages at the Professional Licensing Agency.

What Indiana rules say

Acting as a plumbing contractor or journeyman plumber in Indiana requires a state license. (source: Indiana General Assembly)
Working without a license, or while it is suspended or revoked, is a Class A misdemeanor. (source: Indiana General Assembly)
Continuing to work after a license has expired is a Class B misdemeanor. (source: Indiana General Assembly)
A plumbing contractor's license number must appear in its ads and on its work vehicles. (source: Indiana General Assembly)
An owner who lives in a building of eight or fewer homes may work on its plumbing without a license. (source: Indiana General Assembly)
Apprentice plumbers must work under the direct supervision of a licensed contractor or journeyman. (source: Indiana General Assembly)
Cities and counties can still regulate the quality of plumbing work. (source: Indiana General Assembly)
You can verify a plumber's license through the Professional Licensing Agency. (source: Indiana Professional Licensing Agency)

This page covers statewide rules only. Cities and counties can add their own permits and licenses, so check with your local building office too.

Last updated: November 2, 2026