InstaBids

How do you check a contractor license in Ohio?

The Ohio Construction Industry Licensing Board licenses five kinds of contractor: heating, ventilating and air conditioning, refrigeration, electrical, plumbing and hydronics. Its eLicense lookup, elicense4.com.ohio.gov, searches by credential number. Chapter 4740 excludes residential buildings, as section 3781.06 defines them, from its construction projects; for a home job, also ask your city or county.

Source: Ohio Revised Code, section 4740.01, read 17 October 2026.
Source: Ohio Construction Industry Licensing Board eLicense Center, license lookup, read 17 October 2026.

The license lookup is yours to run on the state's site.

InstaBids is a written-bid marketplace for home jobs: you, or your AI assistant, describe it once; contractors bid in writing on that scope; you choose who gets your number.

Researched by the InstaBids editorial team. Last checked: 17 October 2026

Key facts

Where is Ohio's state lookup for a contractor license?

On the state's eLicense site, elicense4.com.ohio.gov, which offers a search for a license. Its search form, read 17 October 2026, asks for a credential number.

Source: Ohio Construction Industry Licensing Board eLicense Center, license lookup, read 17 October 2026.

Which contractors need Ohio's state license?

The Ohio Construction Industry Licensing Board licenses heating, ventilating and air conditioning, refrigeration, electrical, plumbing and hydronics contractors working on a construction project, as Chapter 4740 defines one. Section 4740.01 lists only these five.

Source: Ohio Revised Code, section 4740.01, read 17 October 2026.

The same section defines a construction project as one involving a building or structure subject to Chapter 3781. of the Revised Code and its rules, "but not an industrialized unit or a residential building as defined in section 3781.06 of the Revised Code."

Source: Ohio Revised Code, section 4740.01, read 17 October 2026.

Section 3781.06 defines a residential building as a one-family, two-family or three-family dwelling house, and any accessory structure incidental to that dwelling house, so a family home falls outside those construction projects.

Source: Ohio Revised Code, section 3781.06, read 17 October 2026.

Within that scope, section 4740.13 says: "No person shall act as or claim to be a type of contractor that this chapter licenses unless that person holds or has been assigned a license issued pursuant to this chapter for the type of contractor that person is acting as or claiming to be."

Source: Ohio Revised Code, section 4740.13, read 17 October 2026.

Is low-voltage work in Ohio outside the electrical contractor license?

Yes, for some systems. Section 4740.13 says: "A person is not an electrical contractor subject to licensure under this chapter for work that is limited to the construction, improvement, renovation, repair, testing, or maintenance of the following systems using less than fifty volts of electricity: fire alarm or burglar alarm, cabling, tele-data sound, communication, and landscape lighting and irrigation."

Source: Ohio Revised Code, section 4740.13, read 17 October 2026.

Can an Ohio city or county require its own contractor registration?

Yes, with one condition. Section 4740.12 says: "No political subdivision, district, or agency of the state may adopt an ordinance or rule that requires contractor registration and the assessment of a registration or license fee unless that ordinance or rule also requires any contractor who registers and pays the registration or license fee to be licensed in the contractor's trade pursuant to this chapter."

Source: Ohio Revised Code, section 4740.12, read 17 October 2026.

Apart from that condition, section 4740.12 leaves two kinds of state and local rules in place.

Source: Ohio Revised Code, section 4740.12, read 17 October 2026.

One kind "Regulates the installation, repair, maintenance, or alteration of plumbing systems, hydronics systems, electrical systems, heating, ventilating, and air conditioning systems, or refrigeration systems".

Source: Ohio Revised Code, section 4740.12, read 17 October 2026.

The other kind "Requires the registration and assessment of a registration or license fee of tradespersons who perform heating, ventilating, and air conditioning, refrigeration, electrical, plumbing, or hydronics construction, improvement, renovation, repair, or maintenance."

Source: Ohio Revised Code, section 4740.12, read 17 October 2026.

What should you ask an Ohio contractor before you hire?

For work in one of the five trades, ask for the credential number and look it up on the state's eLicense site; for a home job, also ask your city or county what it requires. These are practical suggestions, not rules from the statute.

Source: Ohio Revised Code, section 4740.01, read 17 October 2026.
Source: Ohio Construction Industry Licensing Board eLicense Center, license lookup, read 17 October 2026.

  1. Ask which of the five state licenses the contractor holds: heating, ventilating and air conditioning, refrigeration, electrical, plumbing or hydronics.

    Source: Ohio Revised Code, section 4740.01, read 17 October 2026.

  2. Ask for the credential number, then search it on the eLicense lookup at elicense4.com.ohio.gov.

    Source: Ohio Construction Industry Licensing Board eLicense Center, license lookup, read 17 October 2026.

  3. If the job is only fire or burglar alarm, cabling, tele-data sound, communication, or landscape lighting and irrigation work under fifty volts, read the low-voltage rule above before you ask for an electrical contractor license.

    Source: Ohio Revised Code, section 4740.13, read 17 October 2026.

  4. For a home job, ask your city or county whether it requires contractors, or the tradespersons who do the work, to register; Chapter 4740 excludes residential buildings, as section 3781.06 defines them, from its construction projects.

    Source: Ohio Revised Code, section 4740.12, read 17 October 2026.
    Source: Ohio Revised Code, section 4740.01, read 17 October 2026.

Who sees your contact details when you post a job on InstaBids?

One point about InstaBids follows. Contact details stay hidden until the homeowner picks a contractor and they confirm the connection.

Source: InstaBids process and privacy, live-page excerpts, read 17 October 2026.

Live in Broward and Palm Beach, FL. More areas coming.

Post your job on InstaBids, and contractors can bid in writing on one written scope; contractors never pay to see a request or to bid, and there is no fee during our pilot.

Matching is live in Broward and Palm Beach counties, Florida.

Post your request

Sources for the facts on this page