Ohio contractor license requirements: five state-licensed trades, and everything else is local

Ohio splits contractor licensing in a way that surprises people who work across state lines. One state board licenses five trades, but only for commercial projects. Houses are left to the city, village or county building department, and most of the work a small crew does is on houses. This page sorts each trade by who actually issues the paper. This is general information current to October 2026, not legal advice. The business-setup side lives on our Ohio startup page.

The state board licenses five trades, on commercial projects

The Ohio Construction Industry Licensing Board (OCILB) sits inside the Department of Commerce. Under Ohio Revised Code (R.C.) 4740.01, a "license" is issued to an individual as a heating, ventilating and air conditioning contractor, refrigeration contractor, electrical contractor, plumbing contractor or hydronics contractor. The board has three sections: plumbing and hydronics, electrical, and HVAC and refrigeration.

The residential carve-out is in the definition. A covered "construction project" is a building or structure subject to chapter 3781 of the Revised Code, "but not an industrialized unit or a residential building" as defined in section 3781.06 (R.C. 4740.01(F)). In plain terms, the state board's license attaches to commercial work. The Department of Commerce has said that local building departments regulate residential contractors and that many of them ask for the state license when you pull a permit. So an HVAC or plumbing business that is licensed by the state may still be asked for that license by a city, and one that is not may be asked for a local registration. Call the building department in every jurisdiction you work in before you bid.

How a state trade license is earned and held

R.C. 4740.06 sets the route to the exam. You must be at least 18, be a U.S. citizen or lawful resident, carry contractor's liability insurance in an amount the specialty section sets, and have five years as a tradesperson in the trade (three years of construction business experience if you are a registered Ohio engineer). Applicants who hold a substantially similar out-of-state license can qualify with proof of five building authorizations issued in that state, a tax return showing income from the license, and proof their employer is registered in Ohio.

The rules after the exam are practical:

• You can retake a failed exam no sooner than 60 days later. After five attempts you reapply from the start.
• Licenses expire annually, and you can renew up to 90 days ahead with proof of continuing education.
• Fees are set by each specialty section, with limits on how fast they can rise (R.C. 4740.09). Read the current schedule on the Department of Commerce site.
• Reciprocity exists only where a written agreement between states exists and the other state's rules are substantially equal (R.C. 4740.08).

The license belongs to a person, not a company. At application you ask that it be assigned to the contracting company you work for, and the work done under it is treated as supervised by that person (R.C. 4740.07). When that person dies or files a change of company form, the assignment is invalid 90 calendar days later (sooner if the company and the contractor agree), unless another person has assigned a license for the same trade to your company. The person who assigned it must stay actively engaged in the business and be available for consultation. If you are the one name behind your company's HVAC license, plan for that 90-day clock now. The license also does not replace any Ohio fire marshal requirement (R.C. 4740.06(K)). See how to become a licensed electrician and how to become a licensed plumber for the national shape of these paths.

What counts as unlicensed work, and the low-voltage carve-out

R.C. 4740.13 bars anyone from acting as, or claiming to be, a type of contractor the chapter licenses without the license. The attorney general can seek an injunction, and under R.C. 4740.16 the specialty section can fine a violator up to $1,000 per violation per day after a hearing and refer the matter to the local prosecutor.

Two carve-outs matter to small crews. A licensed contractor may install and service related control wiring under 25 volts for equipment tied to their license. And work limited to systems under 50 volts is not electrical contracting for licensing purposes. The statute lists fire and burglar alarms, cabling, tele-data, sound, communication, and landscape lighting and irrigation. That is why a low-voltage landscape lighting crew or a security camera installer does not need the state electrical license for that work alone. A separate state fire-protection certificate can still apply, as the next section shows.

Residential jobs: local permits and a state contract rule at $25,000

Painting, roofing, remodeling, siding, decks and handyman work do not appear in the state board's license list. Local building departments handle residential contractors, so what you need depends on the city. Ask for a contractor registration, a permit schedule and any bond or insurance rule for each place you work.

One state rule applies to larger home jobs regardless of city. Chapter 4722 covers "home construction service" on one-, two- or three-family dwellings, with its contract rules starting at $25,000. The supplier needs a general liability policy of at least $250,000, and must use a written contract for any job that costs $25,000 or more (R.C. 4722.01 and 4722.02). The contract must carry your name, address, phone and tax ID, the owner's details, scope, start and finish dates, total estimated cost, a copy of the insurance certificate and dated signatures from both sides. If unforeseen but necessary extra costs pass $5,000, the owner has a right to a written or oral estimate before you start that work, and the contract has to say so in the statute's language. Cost-plus contracts are excluded. Keep these terms in your online estimate flow.

Pesticides, septic, fire protection and home inspection

Lawn and pest applications. The Ohio Department of Agriculture licenses individuals who apply pesticides for a pesticide business without direct supervision (R.C. 921.06). The business itself needs a pesticide business license, one for each location (R.C. 921.09), and the department will not issue it until the applicant files liability insurance or other financial responsibility (R.C. 921.10). The exam fee is $30, and a license that has been expired for more than 180 days requires re-examination (R.C. 921.12). License terms and fees are set by department rule, so confirm the current expiration date and fee with the department before you schedule your crew. Read our pest control license guide if you are adding weed-and-feed or perimeter pest service.

Septic. Ohio Administrative Code 3701-29-03 requires installers, septage haulers and service providers to register with the local board of health, by category of work. The rule asks for proof of at least $500,000 of general liability coverage, a separate surety bond for each category, and six hours of continuing education a year. Registration ends each December 31.

Fire protection. Under R.C. 3737.65, no one may service, test, repair or install fire protection or firefighting equipment for profit without a certificate or provisional certificate from the state fire marshal. Do not assume your trade license covers it.

Home inspection. R.C. 4764.02 makes it unlawful to conduct a home inspection for pay, or represent that you can, without a license. A home inspection must be done under a written contract with the client and conform to the Ohio Home Inspector Board's standards.

Trades with no state license, and what to confirm next

Mowing, house cleaning, pressure washing, gutter cleaning and junk removal are not on any of the lists above. That does not mean there is nothing to file. You still need an LLC or trade name, workers' compensation once you hire, and a vendor's license where your services are taxable, all covered on the Ohio startup page. Our guides for lawn care in Ohio and pressure washing in Ohio go through those steps.

Whatever licenses you hold, show the license number on your site, estimates and truck lettering. A homeowner can check it in minutes, and a clear licensing page on your own site answers that question before the first call. Rules change, so check each point with the issuing office first.

Frequently asked questions