Ohio contractor laws split along a clean line: the state licenses five specialty trades (electrical, HVAC, plumbing, hydronics, and refrigeration), and everything else, including general contracting, is left to cities and counties. On top of that, every contractor working in Ohio has to deal with the same set of payment deadlines, lien rules, insurance minimums, and consumer protection statutes, regardless of trade. Missing a filing window or skipping a required notice is what turns a routine job into an expensive problem.
Who Needs a State License
The Ohio Construction Industry Licensing Board (OCILB) issues licenses for commercial electrical, HVAC, plumbing, hydronics, and refrigeration work.1Department of Commerce. Ohio Construction Industry Licensing Board If your work falls in one of those five trades, you need the state license before you can perform the work commercially. General contractors, remodelers, roofers, painters, and most other trades are not licensed by the state at all. Their rules come from the city or county where the job sits.
Anyone advertising or working as a licensed contractor without actually holding the license commits a minor misdemeanor on a first offense and a fourth-degree misdemeanor after that. The relevant specialty board can also impose civil fines up to $1,000 per violation per day.2Ohio Legislative Service Commission. Ohio Revised Code Chapter 4740 – Contractor License Law
Getting and Keeping a State Specialty License
To sit for the OCILB exam, an applicant must be at least 18, have five years of experience in the trade immediately before applying (or be an Ohio registered engineer with three years in that trade), pass a state and federal background check, and pass the PSI licensing exam. Once licensed, the contractor must carry at least $500,000 in general liability insurance.3Department of Commerce. Contractors and Contracting Companies
Renewal is annual with eight hours of continuing education, or every three years with 24 hours. Late renewals trigger a fee, and working on an expired license is treated the same as working without one. Ohio no longer requires proof of insurance at renewal, but the $500,000 minimum has to stay in place at all times, and the policy can only be in one contracting company’s name.3Department of Commerce. Contractors and Contracting Companies
General Contractor Licensing Depends on the City
Ohio has no statewide license for general contractors. Cities and counties set their own rules, so the requirements change with the project’s location. Columbus, for example, requires a Home Improvement Contractor License for work on one-, two-, or three-family dwellings. Applicants need at least three years of hands-on residential improvement experience and must pass the Ohio Home Improvement Contractor exam with a 70% or higher.4City of Columbus, Ohio. Home Improvement Contractors Cleveland and Cincinnati have their own systems with different exams and insurance thresholds. Before bidding a job, check with the building department in the specific municipality where the work will happen.
Insurance, Bonds, and Workers’ Compensation
State-licensed specialty contractors must carry at least $500,000 in general liability coverage. Some cities require higher limits, especially on larger commercial projects. Letting coverage lapse can trigger license suspension, and an uninsured contractor who causes damage or injury is personally on the hook.
Many Ohio municipalities also require a surety bond for contractor registration. If a contractor abandons a job or fails to meet their obligations, the bond compensates the owner up to its face amount. Amounts vary by city and trade, and the bond has to stay active through the entire registration period. Contractors who can’t qualify for bonds on the private market may be eligible for the SBA Surety Bond Guarantee Program, which backs bonds on contracts up to $9 million for non-federal projects.5U.S. Small Business Administration. Surety Bonds
Workers’ compensation is not optional. Every Ohio employer with one or more employees must carry coverage through the Ohio Bureau of Workers’ Compensation, and construction companies are covered regardless of size. Sole proprietors and partners without employees can elect coverage voluntarily, but hiring even a single worker makes it mandatory. Operating without coverage exposes the contractor to civil penalties and personal liability for workplace injuries.
Written Contracts and Consumer Protection
Ohio has no single statute requiring a written contract for every contractor agreement, but the practical answer is that you want one on every job. A workable contract spells out the scope of work, itemized costs, materials, estimated start and completion dates, and warranty terms for labor and materials. Any change to the deal after signing should be a written amendment signed by both parties. Ohio courts treat verbal modifications to written contracts with heavy skepticism.
Under the Ohio Consumer Sales Practices Act, a contractor who misrepresents contract terms or fails to honor a written warranty can be sued by the homeowner and by the Ohio Attorney General’s office.6Ohio Legislative Service Commission. Ohio Revised Code 1345.07 – Remedies of Attorney General
The Three-Day Cancellation Right
When a contractor solicits and closes a deal worth $25 or more at a homeowner’s residence, Ohio’s Home Solicitation Sales Act gives the homeowner three business days to cancel.7Ohio Attorney General. Door-to-Door Sales The written agreement must include the seller’s name and address, the date, and the same terms discussed in the sales pitch, along with a detachable cancellation notice form. Work cannot begin until the cooling-off period ends. Starting work early, or failing to provide the cancellation form, violates the statute whether or not the homeowner ever intended to cancel.
Getting Paid: The Ten-Day Rule and Retainage
Once a general contractor receives payment from the owner, they have ten calendar days to pay their subcontractors and material suppliers for the work covered by that payment. The same ten-day rule cascades down to lower tiers. Missing the deadline triggers 18% annual interest on the unpaid amount, running from the eleventh day until paid in full.8Ohio Legislative Service Commission. Ohio Revised Code 4113.61 – Time Limitations for Payments to Subcontractors and Materialmen A contractor can reduce payments by retainage set in the subcontract and can withhold amounts needed to resolve disputed liens, but cannot simply sit on funds.
Retainage is the piece of each progress payment the owner withholds until the work is substantially complete. For Ohio public construction contracts executed on or after September 30, 2025, retainage is capped at 4% of labor costs for the whole project.9Ohio Legislative Service Commission. Ohio Revised Code 153.12 – Awarding and Executing Contract Retained funds must be released within 30 days of substantial completion, holding back only what’s reasonably needed for final completion. Subcontractors can’t be subject to a higher retainage rate than what applies to the general contractor. Private contracts can set their own retainage terms, but only if the contract spells them out.
Mechanic’s Liens: The Deadlines That Kill Them
A mechanic’s lien places a claim on the property itself and can block a sale or refinancing until the debt is resolved. It’s the strongest collection tool a contractor, subcontractor, or supplier has, and Ohio’s rules are unforgiving about deadlines.
Filing Windows
The lien affidavit is filed with the county recorder where the property sits. The clock runs from the last date the claimant worked on or supplied materials to the project:10Ohio Legislative Service Commission. Ohio Revised Code 1311.06 – Affidavit Time Period for Filing
- One- or two-family dwellings and residential condos: 60 days.
- Commercial and other non-residential projects: 75 days.
- Oil and gas improvements: 120 days.
The affidavit must state the amount owed after offsets, describe the property, name the owner and the claimant, and give the first and last dates of work or delivery. A minor address error won’t sink the lien, but a missed filing date will.
The 21-Day Notice of Furnishing
Where the property owner has recorded a Notice of Commencement, certain parties have to serve a Notice of Furnishing before they can lien. Subcontractors and material suppliers who are not in direct contract with either the owner or the general contractor have 21 days from first performing work or delivering materials to serve it.11Ohio Legislative Service Commission. Ohio Revised Code 1311.05 – Notice of Furnishing Original contractors, laborers, suppliers in direct contract with the owner, and subs or suppliers in direct contract with the general contractor are exempt. If the owner never records a Notice of Commencement, no Notice of Furnishing is required. Lower-tier suppliers are where this trips up most often: by the time they realize the 21-day clock started, it has usually already run.
Building Permits and Code
Most construction in Ohio needs a building permit before work starts. Commercial buildings fall under the Ohio Building Code administered by the Board of Building Standards. Residential work on one-, two-, and three-family dwellings follows the Residential Code of Ohio, which covers new construction, repairs, and demolition.12Department of Commerce. Residential Code of Ohio for One-, Two-, and Three-Family Dwellings Residential buildings attached to a commercial structure follow the Ohio Building Code instead.
Permits come from local building departments, so fees and application requirements vary. Applicants typically submit structural plans, project specs, and cost estimates. Fees are often a percentage of construction cost or a flat rate based on scope. Small repairs may be exempt, but starting permitted work without a permit can bring fines, stop-work orders, or an order to tear out and redo completed work. Inspectors visit at set stages, and violations must be corrected before the job moves forward.
Prevailing Wage on Public Projects
Publicly funded construction in Ohio pays workers at the prevailing wage rate set by the Ohio Department of Commerce once the project crosses a threshold:
- New building construction: $250,000.
- Building renovation, repair, or remodeling: $75,000.
- New road or bridge construction (2026): $101,201.
- Road or bridge renovation or repair (2026): $30,320.
Building thresholds are fixed by statute; road and bridge thresholds are adjusted periodically. The public authority must obtain a wage determination from the Bureau of Wage and Hour Administration before advertising for bids, and the rates go into the bid documents and specs. Underpaying workers on a covered project brings state penalties.
Federal Rules That Reach Ohio Contractors
OSHA Fall Protection
OSHA requires fall protection for construction work six feet or more above a lower level. The employer must provide guardrails, safety nets, or a personal fall arrest system.13Occupational Safety and Health Administration. 1926.501 – Duty to Have Fall Protection A fall protection plan can substitute only where the employer can show that using those systems is infeasible or would create a greater hazard. Falls are the leading cause of death in construction, and OSHA enforces this standard aggressively.
Lead Paint (RRP Rule)
Renovation, repair, or painting work in homes built before 1978 falls under the EPA’s Renovation, Repair, and Painting Rule. Both the firm and the individual renovators must be EPA-certified, and the work must follow lead-safe practices. Violations carry fines up to $37,500 per day.14US EPA. What Does the Renovation, Repair, and Painting (RRP) Rule Require A large share of Ohio’s housing stock predates 1978, so this rule reaches a lot of residential renovation work.
Stormwater Permits
Projects that disturb one acre or more need an NPDES stormwater discharge permit from the EPA. Smaller sites that are part of a larger development plan crossing the one-acre total also need coverage.15US EPA. Construction General Permit (CGP) Frequent Questions Waivers are only available for sites disturbing less than five acres, and even those require meeting specific conditions.
1099s and Worker Classification
General contractors and property owners who pay a subcontractor $600 or more in a tax year must file Form 1099-NEC with the IRS and provide a copy to the subcontractor by January 31 of the following year.16Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC The $600 threshold covers services, including parts and materials, paid to individuals, partnerships, and estates.
Classification is the separate, larger risk. The Department of Labor applies a six-factor economic reality test that looks at the worker’s opportunity for profit or loss, permanence of the relationship, control over the schedule and methods, and whether the work is central to the hiring party’s business. Misclassifying an employee as an independent contractor can produce back taxes, penalties, and liability for unpaid overtime and benefits.
Enforcement and Penalties
OCILB investigates complaints against state-licensed specialty contractors and can impose fines, suspensions, or revocations for problems like letting insurance lapse or working outside the scope of the license.1Department of Commerce. Ohio Construction Industry Licensing Board
The Ohio Attorney General’s Consumer Protection Section handles deceptive practices under the Consumer Sales Practices Act. If the AG has reasonable cause to believe a contractor has engaged in deceptive or unconscionable conduct, the office can seek a court injunction. Violating that injunction carries civil penalties up to $5,000 per day. Courts can order reimbursement to affected consumers, appoint a receiver over the contractor’s assets, and void unconscionable contract clauses.6Ohio Legislative Service Commission. Ohio Revised Code 1345.07 – Remedies of Attorney General Local building departments add another layer through stop-work orders and administrative penalties.