Ohio Plumbing Contractor License Requirements (2026)

The Ohio Construction Industry Licensing Board (OCILB) under Ohio Revised Code Chapter 4740 issues the Plumbing Contractor license, which is required for any person who contracts to perform commercial plumbing work in Ohio. The OCILB Plumbing Section sets the experience, examination, bond, and insurance requirements; PSI Services administers the examination. Residential-only plumbing work is regulated at the municipal level and is outside the OCILB scope. The state commercial Plumbing Contractor license authorizes the licensee (or the business they qualify) to bid and perform commercial plumbing work statewide.

Regulatory Oversight

Under Ohio Revised Code Chapter 4740; Ohio Administrative Code 4101:15 (OCILB rules), Ohio Construction Industry Licensing Board (OCILB) is the body that issues this license and enforces compliance with it. The Ohio Construction Industry Licensing Board, housed inside the Ohio Department of Commerce Division of Industrial Compliance, issues statewide commercial licenses for Electrical, Plumbing, HVAC, Hydronics, and Refrigeration contractors. Ohio has no statewide general contractor license — general building work is regulated at the municipal level.

Official portal: https://com.ohio.gov/divisions-and-programs/industrial-compliance/about-us/ocilb
Address: 6606 Tussing Road, Reynoldsburg, OH 43068
Phone: (614) 644-3493

Who May Apply

To qualify, an applicant must have reached age 18 and hold a valid Social Security Number. No Ohio residency requirement.

Good moral character

OCILB conducts a fitness review on every applicant. Felony convictions involving fraud, theft, or construction are reviewed individually under ORC 4740.06.

Background investigation

Mandatory criminal history disclosure on the application.

Required Experience and Education

The applicant must document and verify at least five years of experience as a tradesperson in the plumbing trade under ORC 4740.06, OR registration as an engineer under ORC Chapter 4733 with experience in plumbing construction, OR equivalent experience acceptable to the Plumbing Section. Keep payroll, tax, project, or supervisor records to support the claim, as the board can request proof for any period within its lookback window.

Accepted proof of experience or eligibility

OCILB Experience Verification Form signed by each prior employer or supervising licensed plumbing contractor
W-2 statements, pay stubs, or 1099 records covering the five-year qualifying period
Ohio professional engineer registration (where applicable)
Approved plumbing apprenticeship completion certificate (where applicable)

Education substitution

Registration as a professional engineer under ORC Chapter 4733 with plumbing construction experience may substitute for the tradesperson experience requirement. Accredited plumbing trade school programs are considered by the board on a case-by-case basis.

Examination Requirements

Examinations are administered by PSI Services LLC (under contract to OCILB). The applicant must pass the following examination parts before the license can issue:

Ohio Plumbing Contractor Trade Examination — Ohio Plumbing Code (IPC-based) — 80 questions, 240 minutes, passing score 75%
Ohio Plumbing Contractor Business and Law Examination — 50 questions, 120 minutes, passing score 75%

Examination fee: $70 per examination part paid to PSI on the day of testing.

Retake policy: Failed parts may be re-taken individually with a new fee. Applications remain valid for one year from OCILB approval to sit for the examination.

Insurance and Financial Requirements

The OCILB requires a $25,000 contractor license surety bond to be on file before the license will issue.

General liability

Minimum $500,000 commercial general liability insurance required by ORC 4740.06(E). The certificate must name the OCILB as certificate holder.

Workers' compensation

Workers compensation coverage through the Ohio Bureau of Workers Compensation (BWC) is mandatory for any Ohio employer with one or more employees under ORC Chapter 4123.

Additional financial requirements

No net worth requirement. The $25,000 surety bond and the $500,000 liability minimum together serve as the financial responsibility test under ORC 4740.06.

Licensing Fees

Fee	Amount
Application (non-refundable)	$25
Examination	$140
Initial license	$360
Renewal (every year)	$120

Keeping the License Current

Renewal of the Ohio Plumbing Contractor (OCILB Commercial License) comes due every year. As cited, the renewal fee stands at $120. Ohio OCILB commercial licenses renew annually. Late renewal carries a reinstatement fee under OAC 4101:15.

Continuing education: Ten hours of OCILB-approved continuing education each year, including at least one hour of Ohio law and rules specific to the plumbing trade.

Downloadable Asset

2026 Ohio Plumber License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity and License Transfer

The NASCLA Accredited Examination is not accepted by Ohio for this classification.

Reciprocal State	Accepted Exam	Conditions
Kentucky	Trade exam waived	Bilateral OCILB–Kentucky reciprocity for active plumbing contractors in good standing.
West Virginia	Trade exam waived	Bilateral OCILB–West Virginia reciprocity for active plumbing contractors.
Louisiana	Trade exam waived	Bilateral OCILB–Louisiana State Licensing Board for Contractors reciprocity.
South Carolina	Trade exam waived	Bilateral OCILB–South Carolina Contractor's Licensing Board reciprocity.
Tennessee	Trade exam waived	Bilateral OCILB–Tennessee Board for Licensing Contractors reciprocity.

Ohio maintains bilateral commercial-trade reciprocity with Kentucky, West Virginia, Louisiana, South Carolina, and Tennessee. Reciprocal applicants must still pass the Ohio business and law exam and meet bond and insurance requirements.

Weighing more than one jurisdiction? The national hub compares Plumber license requirements in every state — exam, bond, fee, and experience thresholds side by side.

Application Process, Step by Step

Accumulate five years of plumbing experience. Five years as a tradesperson under ORC 4740.06, or PE registration with plumbing construction experience, or equivalent acceptable to the board.
Prepare experience documentation. OCILB Experience Verification Forms signed by each prior employer or licensed plumbing contractor covering the full five years.
Submit the OCILB application. File the Plumbing Contractor application with the $25 application fee, experience documentation, and fitness disclosure.
Receive OCILB approval to test. The board reviews the application and issues an approval letter authorizing the candidate to schedule with PSI.
Pass both PSI examinations at 75%. Score 75% or better on both the Trade exam and the Business and Law exam.
Post the $25,000 bond and obtain insurance. Submit a $25,000 surety bond and a certificate of insurance showing $500,000 general liability.
Receive the OCILB license. OCILB issues the commercial Plumbing Contractor license. It renews annually.

Frequent Application Errors

Drawn from the board instructions and sources cited on this page, the pitfalls below are the ones most likely to slow down or sink a Ohio Plumber application.

Confusing residential with commercial scope

OCILB only licenses commercial plumbing work. Residential-only plumbers are regulated by cities and do not need the OCILB license.

Missing the 75% pass threshold

Ohio uses a 75% passing score — higher than many neighboring states. Candidates used to 70% thresholds frequently fall short on the first attempt.

Studying the wrong code

Ohio uses the IPC with Ohio amendments. Candidates from UPC states often study the wrong reference and fail the trade exam.

Missing the annual renewal

Ohio commercial licenses renew every year — not every two or three years. Ten hours of CE including Ohio law and rules are required each cycle.

Assuming reciprocity waives everything

Reciprocal applicants from KY, WV, LA, SC, or TN still must pass the Ohio business and law exam and post the Ohio bond and insurance.

Recommended References

The references below are either cited by the board, used during the application, or standard preparation for the trade. They are listed purely for convenience — CLR earns no commission on any of them.

Ohio Plumbing Code (IPC-based, Ohio-adopted edition) — International Code Council / State of Ohio. Primary technical reference. Open-book at the PSI test center.
Ohio Revised Code Chapter 4740 and OAC 4101:15 — State of Ohio. Licensing law and rules.
PSI Ohio Plumbing Contractor Candidate Information Bulletin — PSI Services LLC. Current exam outline, reference list, and scheduling information.

Document Checklist

The items below are the ones worth confirming before the application is filed with OCILB:

☐ Five years of plumbing experience documented on OCILB Experience Verification Form
☐ OCILB Plumbing Contractor application with $25 fee
☐ PSI Trade exam pass certificate at 75%+
☐ PSI Business and Law exam pass certificate at 75%+
☐ $25,000 OCILB surety bond
☐ $500,000 commercial general liability certificate naming OCILB as holder
☐ Ohio BWC workers compensation certificate for any employees

Other Ohio Trade Licenses

Should the Plumber path not apply, these other Ohio trade guides from CLR may help:

Questions Applicants Ask

When does Ohio require an OCILB Plumbing Contractor license?

Any person who contracts to perform commercial plumbing work in Ohio must hold an OCILB Plumbing Contractor license under ORC 4740.02. Residential-only plumbing is regulated at the municipal level.

How many years of experience does Ohio require?

Five years of experience as a tradesperson in the plumbing trade, or registration as a professional engineer under ORC 4733 with plumbing construction experience, or equivalent experience acceptable to the Plumbing Section.

What plumbing code does Ohio use?

Ohio adopts the International Plumbing Code (IPC) with Ohio amendments as the Ohio Plumbing Code. The OCILB Trade exam is built around the adopted edition.

What bond and insurance does Ohio require?

A $25,000 surety bond and $500,000 commercial general liability insurance under ORC 4740.06. Workers compensation through Ohio BWC is mandatory for any employer.

Does Ohio reciprocate plumbing contractor licenses?

Yes. OCILB maintains bilateral reciprocity agreements with Kentucky, West Virginia, Louisiana, South Carolina, and Tennessee. Reciprocal applicants still must pass the Ohio business and law exam.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-04-29 · Next scheduled review 2026-07-28