How to check a contractor's license in Ohio

Which license or registration does the contractor need in Ohio?

The state license is held by a person, not a firm. To qualify, the applicant needs five years in the trade (or three years of construction business experience as an Ohio-registered engineer) and must pass an exam (ORC 4740.06). The license is then assigned to one contracting company, and the holder must carry at least $500,000 of "complete operations" liability insurance, in the company's name when the license is assigned to one (OAC 4101:16-2-09).

One catch: the licensing law's "construction project" excludes "a residential building" (ORC 4740.01). The state does not require the license for house work; Cleveland and Cincinnati require it through their registrations. Cleveland says "To register as an electrical, plumbing, or HVAC contractor, you must first be licensed by the State of Ohio" (Building & Housing). Cincinnati registers "OCILB Licensed Specialty Contractors" as their own class (FAQ), and their city registration "is valid until the State license expires" (City of Cincinnati).

How to look a contractor up, step by step

1. Ask for two numbers: the OCILB license number (for electrical, HVAC or plumbing work) and the city registration number. Cincinnati's own subcontractor form asks for the registration number of every trade on the job.
2. Open the OCILB License Lookup. Pick the license type (EL Electrical, HV HVAC, HY Hydronics, PL Plumbing, RE Refrigeration) and type the credential number, or the license holder's first and last name. There is no business-name box on this page.
3. If you only have the company name, use "Lookup Licensee by Employer", the Company Licensee Lookup. Untick "Exact Match" if the full name returns nothing.
4. Open the credential detail and check the status, the license type against your job, and that the company it is assigned to is the one on your quote.
5. Check the city registration (next section).
6. For any job over $25,000, check the contract against ORC 4722 (the section after that).
7. If something is wrong, call the OCILB on 614-644-3493. Its complaint form says it "may not have authority over residential contractors" and sends workmanship and code complaints to the local building department or the Ohio Attorney General, 1-800-282-0515 (OCILB complaint form).

Cincinnati and Cleveland: the city registration

Cincinnati requires "all contractors performing work in the City of Cincinnati limits, to maintain a current contractor registration" under Municipal Code Chapter 1106. The fee is $125 plus surcharges, $131.25 a year, for up to three years. Owners of a one-, two- or three-family home who do the work themselves and live there for at least a year afterwards are exempt (City of Cincinnati). The check takes two minutes: open Find A Registered Contractor, type part of the name on the quote, and pick the contractor type (plumbing, hydronic, refrigeration and suppression are marked "State Licensed"). The current registration checklist requires liability insurance of at least $100,000 for one person and $300,000 for one occurrence. Fines appear only in the city's FAQ, a PDF dated July 2018 that still shows the old $130 fee: a $750 citation for a first violation (cut to $325 on appeal if the firm registers), and $1,500 plus a one-year bar for a second. Confirm current fines with the Contractor Registration Section, 513-352-3271, option 1.

Cleveland's Building & Housing "registers building contractors". The trade packages on its Resources page are scanned forms with no date on the page; the file of the HVAC package dates from 2014 and its application form is marked 5/2005, so treat its figures as the city's last published ones. The form lists general, sewer, demolition, electrical, HVAC, plumbing and other registrations, with electrical, HVAC and plumbing ticked "1, 2, 3 family only" or "all work", at $150 new and $120 renewal. The HVAC package asks for a $25,000 bond and at least $200,000 of insurance. New registrations must include a copy of the state HVAC license, but a renewal "without a state license will be limited to a residential only registration". So an older Cleveland HVAC firm working on houses may hold only the city registration. We found no online search of Cleveland registrations; call (216) 664-2282 and ask whether the firm's registration is current and which class it covers.

Columbus: what the city registers, and what nobody licenses

Ohio does not license home builders or remodelers, so in Columbus the check is the City's own license plus the permit record. Building and Zoning Services says "All contractors performing work within the city are required to obtain the appropriate license or registration before they can apply for permits and begin the job." It issues a General Contractor license (new commercial or multi-family construction), a Home Improvement General license (structural work on existing 1, 2 and 3 family homes), a Home Improvement Limited license (roofing, siding, decks, fencing), and requires OCILB licenses first for electrical, HVAC, refrigeration, hydronics and plumbing firms. General Contractor applicants post a $25,000 bond (City of Columbus, read 21 October 2026). The page names no license for building a new single-family house, so ask BZS, (614) 645-7433, which license your builder should hold before you sign.

The two-minute check: search the builder on the City's Search for Licensed & Registered Contractors, then look at its permit record. 148 home builders filed 2,607 new-home permits in the City of Columbus from October 2023 to September 2026, and 92.5% of those a year or more old were closed out, the usual one 252 days after issue. A builder far below that share has open houses to explain. The Columbus new-home builder list shows each one; the full city license table is in our Columbus license lookup guide.

The $25,000 rule for home jobs (ORC 4722)

Ohio's real consumer check on house work is not a license but a contract rule. It applies to a "home construction service contract", work on a one-, two- or three-family home "for an amount exceeding twenty-five thousand dollars" (ORC 4722.01).

A $60,000 kitchen quote that asks for 30% up front and has no insurance certificate attached fails this rule twice.

Penalties for unlicensed trade contracting in Ohio

"No person shall act as or claim to be a type of contractor that this chapter licenses" without the license (ORC 4740.13). It is "a minor misdemeanor on the first violation and a misdemeanor of the fourth degree on subsequent violations" (4740.99). After a hearing, the board may also fine "not exceeding one thousand dollars per violation per day" (4740.16). Low-voltage work under 50 volts, such as alarms, data cabling and landscape lighting, does not need an electrical contractor's license (4740.13).

What the license does not tell you

Whether the firm's permits passed inspection. Both cities publish that, and we read it:

Firms differ more than cities do. Among Cleveland plumbing firms with 10 or more permits, the finished share runs from 36.5% at the 10th percentile to 85.6% at the 90th. Of those 70 firms, 41 finished fewer than 70% of their permits; in Cincinnati it was 4 of 98. A license check cannot show that difference. The permit record does.

The limit of our data: we do not yet hold an Ohio license file, so for Cincinnati and Cleveland firms we show no license status at all. Every firm is "unmatched", which says nothing about whether it is licensed. Use the OCILB lookup and the city check above for that.

Red flags on an Ohio license or contract

• An electrical, HVAC or plumbing firm whose license number returns a different company in the Company Licensee Lookup.
• A firm that is not on Cincinnati's registered contractor list, or that Cleveland cannot confirm by phone.
• A Cleveland registration marked "1, 2, 3 family only" on a bid for a larger building.
• A home job over $25,000 with no written contract, no insurance certificate, or a down payment above 10%.
• A contractor who claims to be "state licensed" for general or remodel work. Ohio issues no such license.

See every Cleveland plumber by their permit record →

See every Cincinnati HVAC contractor by their permit record →