Running a trade business in Ohio: OCILB licenses, the BWC monopoly and liens

Ohio's system is upside-down compared with most states: commercial trade work is licensed statewide while residential licensing is left to cities. Add a state-run workers comp monopoly and you get a rulebook that deserves a local read. Here is 2026 in brief.

Statewide commercial licenses, local residential rules

The Ohio Construction Industry Licensing Board (OCILB) licenses commercial contractors in five trades: electrical, plumbing, HVAC, hydronics and refrigeration. Requirements include five years of trade experience (or engineering credentials), exams, background checks and insurance. Residential-only work generally needs no state license, but municipalities fill the gap: Columbus, Cincinnati, Cleveland and many suburbs register or license residential contractors, so multi-city operators end up with a folder of local cards. General contracting as such is unlicensed at state level.

Workers comp: the state is the insurer

Ohio is one of four monopolistic states: employers must buy workers compensation from the Ohio Bureau of Workers Compensation (BWC), not the private market, from the first employee. Premiums are experience-rated and the BWC runs safety programs that can discount them. Out-of-state contractors working Ohio jobs need Ohio coverage; your home-state policy does not travel here.

Mechanics lien deadlines

Ohio liens run on tight clocks: generally 60 days from last work on residential dwellings and 75 days on commercial projects to record the affidavit, with oil and gas well work at 120 days. Where an owner records a Notice of Commencement, subs and suppliers should serve a Notice of Furnishing within 21 days of starting to preserve full rights. Confirm the current statute on anything marginal, because the categories matter.

Tax and OSHA

Contractors pay sales tax on materials for real property improvements, and several services are taxable in Ohio, including some building maintenance and janitorial categories. Federal OSHA covers private worksites.

Ohio FAQs for trade businesses

Can I buy workers comp from a private insurer in Ohio?

No. Ohio is a monopolistic state: coverage comes from the Ohio BWC. Out-of-state policies do not cover Ohio work, so register with BWC before your crew crosses the line.

Do I need a state license for residential electrical work?

The OCILB licenses are for commercial work. Residential licensing is municipal, and cities like Columbus and Cincinnati run their own registrations, so check each city you work in.

How long do I really have to file an Ohio lien?

Short: generally 60 days from last work on home projects and 75 days on commercial. With deadlines this tight, invoice disputes need to trigger lien preparation immediately, not after another round of calls.

This guide is general information, not legal advice. Licensing thresholds, lien statutes and tax rules change; always confirm current requirements with the licensing board, an attorney or your accountant before relying on them.