Plumber license requirements in Ohio.
Ohio licenses commercial plumbing contractors at the state level through the Ohio Construction Industry Licensing Board, which sits in the Department of Commerce. The state license covers contracting; journeyman-level licensing and residential requirements are handled by cities and counties, so most Ohio plumbers deal with both layers.
What Ohio requires.
Plumbing Contractor (state license)
Issued by OCILB for commercial plumbing contracting. This is the state-level credential the business runs on.
Local journeyman / residential licenses
Cities and counties issue their own plumbing licenses and registrations — check every jurisdiction you plan to work in.
Getting the Plumbing Contractor
- At least five years of experience as a plumbing tradesperson — or three years of business experience in the plumbing industry as a registered engineer
- Document that experience (for example W-2s, Schedule C, or K-1 filings) plus proof such as pulled permits, a journeyman card, or an approved apprenticeship completion
- Pass a trade exam and a business and law exam through the board’s testing vendor
- Carry contractor’s liability insurance at or above the board’s minimum
- Pass a state and federal background check
- · The OCILB license is the commercial contracting credential — it does not replace local licensing for journeyman or residential work.
The official board
Ohio Construction Industry Licensing Board (OCILB) — Ohio Department of Commerce
Visit the boardVerified 2026-08 against the sources below. Licensing rules change — confirm with the board before relying on this page.
Ohio plumbing licensing FAQ.
Do you need a license to do plumbing work in Ohio?
For commercial plumbing contracting, yes — Ohio requires a state plumbing contractor license from the Ohio Construction Industry Licensing Board. Journeyman-level and residential requirements are set locally, so you also need to check the city or county where you work.
Who issues plumbing contractor licenses in Ohio?
The Ohio Construction Industry Licensing Board (OCILB), part of the Ohio Department of Commerce. OCILB licenses plumbing, HVAC, electrical, hydronics, and refrigeration contractors after they pass the required exams.
How much experience do you need for an Ohio plumbing contractor license?
At least five years of experience as a plumbing tradesperson, or three years of business experience in the plumbing industry if you are a registered engineer. You have to document it with tax records plus evidence such as permits, a journeyman card, or an approved apprenticeship completion.
Does Ohio have a state journeyman plumber license?
No. Ohio’s state license is the plumbing contractor license issued by OCILB. Journeyman plumber licensing is handled by local jurisdictions, so requirements vary by city and county.
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