Plumbing Contractor License in Ohio: Requirements, Qualifier, Bond and Exams

Both, split by the kind of work.

Ohio licenses plumbing contractors at the state level for commercial work: the Ohio Construction Industry Licensing Board's plumbing and hydronics section licenses plumbing contractors (and hydronics contractors), and the licensing chapter says no one may act as — or claim to be — a contractor it licenses without holding or being assigned that license.

Residential plumbing is different: local building and health departments regulate residential contractors, and state law lets those departments require the state commercial license for residential work.

There is no state journeyman or master plumber license for individual workers; the contractor license is the state's only plumbing credential.

The Ohio Construction Industry Licensing Board (OCILB), part of the Ohio Department of Commerce's Division of Industrial Compliance, issues the state trade contractor licenses, and its plumbing and hydronics section has primary responsibility for licensing plumbing contractors and hydronics contractors.

For a plumbing business that means two classes: the plumbing contractor license and the separate hydronics contractor license.

OCILB says the license is assigned to only one company name (no DBAs), the license number must appear on the company's advertising, and workers under the license must be W-2 employees; 1099 workers need their own license.

In Ohio the qualifier is the license holder: the board issues the license to an individual, and the company works through that person — a license may not be assigned to more than one contracting company at a time.

To sit for an OCILB contractor exam you must be at least 18, a U.S. citizen or legal alien, and have been a tradesperson in the trade for not less than five years immediately before you apply; an Ohio-registered engineer with three years of trade business experience, or other experience the section accepts, can take its place.

OCILB accepts a journeyman card, an Ohio- or USDOL-approved apprenticeship completion certificate, or 40 hours of approved code continuing education as experience evidence, and education other than an approved apprenticeship can replace at most one of the five years.

Ohio issues no state journeyman plumber license, and our research did not verify which journeyman cards the board accepts in practice.

You can check whether a prospective qualifier holds the license through OCILB's eLicense Center and its downloadable current licensee roster.

Ohio's contractor exam has two parts: one trade part specific to the license you apply for — plumbing, for a plumbing contractor application — and one business-and-law part, each passed at 70%.

Ohio's plumbing contractor license follows the same OCILB rules as its HVAC contractor license, including the two-part PSI exam passed at 70%; what carries the plumbing content is the trade part, which the rule makes specific to the trade you apply for.

PSI administers OCILB's exams.

A business-and-law part you have already passed counts toward another trade license for three years, so adding the hydronics license within that window does not mean repeating the business-and-law part.

Our research does not cover the exam content outlines, and PSI's exam fee is not confirmed in our research — get the current candidate information from OCILB before you book.

Ohio requires licensed contractors to carry at least $500,000 in contractor liability insurance including completed-operations coverage, and the policy must be in the name of the company the license is assigned to.

Our research found no surety bond requirement in the rules we checked — the licensing chapter and the board's rules — but that is an absence in our reading, not a board statement.

Ask OCILB whether anything beyond this insurance applies to your situation before you bid.

OCILB's fees are $25 for the exam application, $25 for license issuance, and $60 for an annual renewal or $180 for a three-year renewal, with a late fee of up to $120.

Renewal also takes continuing education: OCILB's website states 8 hours of CE for a one-year renewal and 24 hours for a three-year renewal, and the rule text sets 10 classroom hours of approved CE per year with a two-hour reduction for licensees in the Compliant Contractor Program — 8 hours annual or 24 hours triennial.

OCILB also describes an inactive (escrow) option: the license can sit in escrow indefinitely, with the $60 renewal fee paid annually but no CE or insurance owed, and reactivating takes up to 24 hours of CE plus proof of insurance.

Yes, by trade.

OCILB lists plumbing reciprocity with Arkansas, Mississippi, South Carolina, Tennessee and West Virginia, and Mississippi, South Carolina and Tennessee also require the business-and-law exam under those agreements.

The board's page carries the current list and conditions, so check it before you rely on an agreement.

Because the license belongs to the individual, a qualifier who leaves takes the credential with them.

When a license holder leaves a company, the assignment becomes invalid 90 calendar days after the contractor completes a change-of-company form — the statute's other trigger is the holder's death — or earlier by agreement.

OCILB says a signed letter of release from the previous company allows immediate reassignment.

The form starts that 90-day clock, so line up a replacement qualifier inside the window.

Our research found no dollar threshold in Ohio's contractor licensing chapter: nothing we read ties the plumbing contractor license requirement to a job value.

That absence is our reading of the chapter text, not a board statement, so confirm it with OCILB before you assume small commercial jobs are exempt.

Residential plumbing is not OCILB's: local building and health departments regulate residential contractors, and state law allows those departments to require the state commercial license for residential work.

Local departments may also keep their own rules for residential plumbing, which our research did not verify — confirm with the building or health department in each city and county where you work.