Ohio plumbing license requirements and insurance

To work for yourself as a plumber in Ohio, you need the Plumbing Contractor (state license, also called a master license) license. Ohio has 2 plumbing license types, and which one you need depends on the work you take on. The state's minimum liability insurance is $500,000, and workers' comp is required once you have employees. The state does not ask for a bond.

Checked by the Trades by State editor on 2026-09-16 Based on 22 official pages, listed at the bottom Something wrong? Tell us

License you need: Plumbing Contractor (state license, also called a master license) Renew Annual, or every three years if you choose the three-year option
Insurance you must carry: $500,000 liability, at least
Workers' comp: Required as soon as you hire anyone
Credit score: None or take a 14-hour course
To protect your pay, send notice by: Send the Notice of Furnishing within 21 days of your first day of work or first delivery (first work on March 1 means notice by March 22). A late notice only protects the 21 days before you sent it

Turn this into a checklist

1 What stands out in Ohio for a plumber What is this?

The things people get wrong or do not expect about Ohio, in a few sentences.

The Ohio state plumbing license is for commercial work only. Houses and other residential buildings are left out of the state law, so residential plumbing is licensed by cities and counties, and each one has its own rules.
Your $500,000 liability insurance and your license both have to be in the name of a contracting company, not in your own name. The state will not issue the license to you alone.
The state fees are small. $25 to apply, $25 for the license, $60 a year to renew. The exam fee paid to PSI and the BCI and FBI background check are on top.
You buy workers' comp from the state, through the Bureau of Workers' Compensation, as soon as you have one employee. The application costs $120. A sole owner or partner can leave themselves out.
On a normal plumbing job you charge the customer no sales tax at all, on labor or on materials. You pay the tax yourself when you buy the materials. The exception is a business fixture, an item that serves the business rather than the building.
A subcontractor only has to send a Notice of Furnishing if the owner recorded a Notice of Commencement. The deadline is 21 days from your first day. The lien itself must be filed within 60 days of your last day on a house, or 75 days on any other job.

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·7 official pages

2 Who issues plumber licenses in Ohio? What is this?

Ohio Construction Industry Licensing Board (OCILB), part of the Ohio Department of Commerce, Division of Industrial Compliance issues plumbing licenses in Ohio.

Name	Ohio Construction Industry Licensing Board (OCILB), part of the Ohio Department of Commerce, Division of Industrial Compliance
Website	https://com.ohio.gov/ocilb
Look up a license	https://elicense4.com.ohio.gov/lookup/licenselookup.aspx
The law	Ohio Revised Code chapter 4740
The rulebook	Ohio Administrative Code chapter 4101:16
Home jobs	The state law leaves out residential buildings, so the state license covers commercial work. Residential plumbing is licensed by cities and counties, so ask your local building department what it wants.

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3 Ohio plumber license requirements and fees What is this?

Ohio has 2 license types that matter to a plumber. The Plumbing Contractor (state license, also called a master license) needs five years as a plumbing tradesperson right before you apply. You prove it with five years of tax documents (W-2s or Schedule C) plus one of these. A permit for each of the last five years pulled by the licensed contractor you worked for. A current journeyman card. A certificate from an apprenticeship approved by Ohio or the US Department of Labor. Or 40 hours of live or virtual code classes from an OCILB-approved training agency. Sewer, water service, gas service and drain-cleaning permits do not count. Two other routes exist: a registered professional engineer in Ohio with three years of business experience in the trade, or five years as an Ohio government inspector in the trade. Military service can count toward the five years.

Plumbing Contractor (state license, also called a master license)

Anyone who contracts for plumbing work on a commercial construction project in Ohio. The license is issued to you but must be assigned to a contracting company, and the company's name goes on it

What you can work on

Plumbing work on commercial construction projects anywhere in Ohio. Cities and counties issue their own licenses or registrations for residential work

Experience required

Five years as a plumbing tradesperson right before you apply.
You prove it with five years of tax documents (W-2s or Schedule C) plus one of these.
A permit for each of the last five years pulled by the licensed contractor you worked for.
A current journeyman card.
A certificate from an apprenticeship approved by Ohio or the US Department of Labor.
Or 40 hours of live or virtual code classes from an OCILB-approved training agency.
Sewer, water service, gas service and drain-cleaning permits do not count.
Two other routes exist: a registered professional engineer in Ohio with three years of business experience in the trade, or five years as an Ohio government inspector in the trade.
Military service can count toward the five years.

Other requirements

You must be 18, a US citizen or legal alien, and pass a BCI and FBI background check after the board approves you and before you sit the exam. A disqualifying criminal offense blocks you

Training required

None required if you qualify by experience. The 40-hour code class option is one way to prove the experience

Exam

Yes, a computer-based exam run by PSI, in two parts: trade and business and law.
You need 70 percent on each part.
A pass on the business and law part stays good for three years.
Board approval to test lasts one year

Fees

Application	25
Exam	Not listed yet
Background check	Not listed yet
First license	25
Renewal, yearly	60
Renewal, every three years	$180
Late renewal, most you can be charged	$120
Bounced check fee	30

Renewal

Annual, or every three years if you choose the three-year option

Training hours each year

About training hours

10 classroom hours a year.
Members of the compliant contractor program (one clean year with on-time renewals and no discipline) need 8 hours a year, or 24 hours for a three-year renewal.
The statute caps continuing education at 10 hours a year.

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Journeyman and apprentice plumber

The state does not license journeyman or apprentice plumbers. A journeyman card from a city, county or union program is one way to prove experience for the state contractor license

What you can work on

Set by the city or county that issues the card

Experience required

Set locally

Exam

Set locally

Fees

Set locally

Checked by software against the official page·dam.assets.ohio.gov

4 How much insurance does a plumber need in Ohio? What is this?

The least liability insurance Ohio lets a plumber work with is $500,000. Most customers ask for more. Workers' comp is required once you have employees.

Minimum liability insurance	$500,000
Type of policy	Contractor liability insurance
Who this applies to	Every state-licensed contractor. The policy and the license must both be in the name of the contracting company, as defined in Ohio Revised Code 4740.01
Who must be named on the certificate	You send a Certificate of Liability Insurance with your license application and confirm the cover again at every renewal. The state's page does not say the board must be named as certificate holder
Workers' comp required?	Yes, as soon as you have one employee, and Ohio sells the cover itself through the Bureau of Workers' Compensation (BWC)
Workers' comp: application fee	$120
Who can opt out	A sole proprietor, a partner, or an LLC taxed as a sole proprietor or partnership can leave themselves out. Cover for the owner is optional and you add it on the same form. Policies renew every July 1 until you cancel in writing

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5 Does Ohio check your credit for a plumber license? What is this?

Ohio does not check your credit for this license.

Credit score you need	None
If your score is lower	Not applicable

Checked by software against the official page·law.cornell.edu

6 Does a plumber need a bond in Ohio? What is this?

Ohio does not require a state bond for this license. Some cities ask for one before they issue permits.

Does the state require a bond?	No
Amount	Not listed yet

The state does not ask for one. Cities and counties often ask for a bond (a promise, backed by an insurance company, that customers can be paid if you do not finish the job) before they register you for residential work or let you pull permits. Check with each city you work in.

Checked by software against the official page·law.cornell.edu

7 Where must an Ohio plumber show the license number? What is this?

In Ohio: put your license number, written as OH LIC# followed by the number, on your business locations, business cards, work vehicles that carry the business name, contracts and advertisements, including phone directory listings. Pens, pencils, t-shirts and hats are exempt. Hang the license itself in each office and at each job site.

The rule	Put your license number, written as OH LIC# followed by the number, on your business locations, business cards, work vehicles that carry the business name, contracts and advertisements, including phone directory listings. Pens, pencils, t-shirts and hats are exempt. Hang the license itself in each office and at each job site.
If you forget	Not stated in the display rule. The board can discipline a license under Ohio Revised Code 4740.10

Checked by software against the official page·law.cornell.edu

8 Does a plumber charge sales tax on labor in Ohio? What is this?

Whether Ohio taxes your labor, your materials, or neither.

See how this compares in every state: Sales tax on labor for plumbers and HVAC contractors by state

Construction contract work	Most plumbing work is a construction contract, meaning what you install becomes part of the building. You are the consumer of the materials. You pay sales tax when you buy them and charge the customer no tax on labor or materials.
Business fixtures	An item that is attached to the building but mainly serves the business run there is a business fixture. Installing one is a sale, not a construction contract. You buy it tax-free for resale and charge the customer tax on it. Whether the installation labor is taxed on top. Ask the Department of Taxation.
Homes versus businesses	No difference for construction contract work. The test is what you install, not whose building it is
Tax-exempt customers	A tax-exempt customer, such as a church or government body, gives you a construction contract exemption certificate (form STEC CC) so you can buy the materials tax-free
Tax rate	State rate plus county rates. The state rate was not read on an official page, so verify it at tax.ohio.gov

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9 Getting paid: lien and notice deadlines for an Ohio plumber What is this?

If you are not paid in Ohio, a lien on the property is your backstop, but only if your notice goes out on time: send the Notice of Furnishing within 21 days of your first day of work or first delivery (first work on March 1 means notice by March 22). A late notice only protects the 21 days before you sent it.

Who has to send a notice	Subcontractors and material suppliers who were hired by the contractor, not by the owner, and only when the owner has recorded a Notice of Commencement (a public record that the project has started). If no Notice of Commencement was recorded, no notice is needed. Laborers paid by the hour never need one
Send your notice by	Send the Notice of Furnishing within 21 days of your first day of work or first delivery (first work on March 1 means notice by March 22). A late notice only protects the 21 days before you sent it
About home construction	The Notice of Furnishing rules do not apply to a home construction contract (a contract with the owner to build or improve a one- or two-family house they live in). Different owner-protection rules apply on those jobs: verify in Ohio Revised Code 1311.011
File your lien by	File the lien affidavit with the county recorder within 60 days of your last day of work on a one- or two-family house or a residential condominium unit (last work on March 1 means filing by April 30). On any other job you have 75 days (last work on March 1 means filing by May 15)

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10 How much does it cost to become a plumber in Ohio? What is this?

The government fees on this page add up to about 50 in Ohio. Add insurance, tools, and a vehicle to get the real number.

Government fees, added up	50

Does not include the PSI exam fee, the BCI and FBI background check, the $120 workers' comp application, insurance premiums, tools, a vehicle, or city licenses and permits

Our estimate

11Where these numbers come from

The labels under each table are explained on how to read a page.