Ohio is a two-layer state. There is no statewide license for residential plumbers or journeyman-level work, but commercial plumbing contractors need a state plumbing license in Ohio from the Ohio Construction Industry Licensing Board (OCILB). Day-to-day plumber licensing happens at the city level.
Who runs plumbing licensing in Ohio
The Ohio Construction Industry Licensing Board, part of the Ohio Department of Commerce, licenses commercial plumbing contractors statewide. Cities handle the rest: Columbus, Cleveland, Cincinnati, Toledo, Akron, and Dayton each run their own contractor registration, and many Ohio cities license journeyman plumbers locally.
License types
- State commercial plumbing contractor (OCILB): required to contract commercial plumbing work anywhere in Ohio.
- Local licenses and registrations: residential and journeyman-level licensing is handled by your city or county. Requirements vary, so check the building department where you plan to work.
OCILB contractor requirements
- Experience: document 5 years working at the journeyman level in the trade (or 3 years as an Ohio-registered engineer in a related field).
- Exams: pass the PSI Business and Law exam plus the plumbing trade exam, 70 percent or better on each.
- Application: submit the OCILB application with the $25 fee.
- Insurance: show $500,000 in contractor liability coverage with OCILB named as certificate holder.
Working across cities
Even with a state OCILB license, register locally in each city where you pull permits. Build that into your pricing, because registration fees add up across a metro area.
How to apply
Applications, exam candidate bulletins, and license verification are on the OCILB page.
FAQ
Do I need a state license for residential plumbing in Ohio?
No statewide license exists for residential-only work, but your city very likely requires local registration or licensing. Check before you bid work.
How long before I can be a plumbing contractor in Ohio?
Plan on roughly 5 years of journeyman-level experience before you qualify for the OCILB exams.
Ready to hang your own shingle?
Read how to start a plumbing business, compare other states on the plumbing license by state index, or get the basics in the plumbing license overview.
Requirements change. Always confirm current rules, fees, and forms with the board before you apply. This page is a guide, not legal advice.
