Anyone can print a business card with a license number on it. What they can't fake is the state board's database — and that database is public, free, and searchable from your phone. This is the highest-value check you can run before hiring, because it answers questions a reference never will: is this license real, is it current, and has the board ever had to discipline this person?
Get the legal business name and license number. Ask directly. A licensed contractor hands these over without blinking, and in many states the license number is required to appear on contracts and advertising. If the number only shows up after you push for it, note that.
Find the right board. Search "contractor license lookup" plus your state. General contractors usually sit under a state contractor licensing board; electricians, plumbers, and HVAC contractors often have their own separate boards and databases. A few places license mainly at the county or city level instead — if the state search comes up empty, that's where to look next, not a dead end.
Run the lookup and read the record carefully. Searching by license number is cleanest; searching by name works too, though common names return lookalikes. Once you have the right record, check it against this list:
Check the classification against your job. Licenses aren't one-size-fits-all. In many states, a general building license doesn't by itself authorize roofing, electrical, or plumbing work, and handyman-type registrations often cap the job size or exclude trade work entirely. The class is right there on the record — if the job is a roof and the license says painting, you have your answer.
Then verify insurance — separately. Ask for a certificate of insurance, and have it sent directly from the contractor's insurance agent rather than handed over by the contractor. Check that general liability and workers' compensation are both listed and in date. A two-minute call to the agent confirms the policy is real and hasn't lapsed since the certificate was printed.
"Licensed, bonded, insured" gets recited like one word, but they're three different things. The license is the state's permission to do the work. Insurance pays for accidents and damage. A bond is a surety company's promise that you can file a claim — up to a usually modest bond amount — if the contractor abandons the job or fails to finish it as contracted. Worth having, but it's the smallest of the three protections. The license and the insurance do the heavy lifting. This check is also just the first layer of what to do before hiring a contractor; licenses first, then the questions, the references, and the contract itself.
Borrowed numbers. The number is real — and belongs to somebody else, often a former employer or a relative. In most states the license holder has to be the one contracting the job; working under another person's license isn't allowed. A name mismatch on the record is one of the classic red flags when hiring a contractor, and it takes thirty seconds to spot.
The lapsed license. They were licensed — until last year. A lapsed license usually means the insurance and bond requirements tied to it lapsed right along with it, which quietly removes every protection the license was supposed to give you.
The permit dodge. "We don't need a permit for this," said about work that plainly needs one, often means "I can't pull one." Licensed contractors pull permits in their own name. An operator who can't will suggest the homeowner pull the permit instead — which transfers the liability for the work onto you.
Accepting a photocopy as proof. A license card or certificate on paper can be old, borrowed, or edited. The board's live record is the only version that counts — and it's easier to get than the photocopy was.
Verifying only the person you're about to hire. Check every serious bidder the same way, while you still have choices. It pairs naturally with getting several contractor quotes: the cheapest bid from an unlicensed operator was never actually the cheapest bid.
Skipping it for small jobs. A "small" drain repair done wrong floods the same floor as a big one. The check takes ten minutes regardless of the job size, and small jobs are exactly where unlicensed operators concentrate.
Ten minutes on the state board's website tells you whether a contractor is legal, current, properly classified, and clean with the board — and one short call to their insurance agent confirms the coverage is real. Do it for every bidder, before deposits and before anyone starts work. Legitimate contractors expect these checks. The only people inconvenienced by them are the ones you were about to hire by mistake. Protect the payment end of the job the same way by learning what a lien waiver is for contractors before the final check changes hands.
The rules vary by state and by trade, and in many places the contractor is the one breaking the law by doing the work. The practical risk lands on you either way: no licensing board to complain to, possible trouble with permits and inspections, and a harder fight if the work damages your home. Legal or not where you live, it's a bad trade.
Some trades are licensed locally, and a few aren't licensed at all in some states. Then the license check becomes a registration check — city or county records — and the weight shifts to the other verifications: insurance confirmed with the agent, real references you actually call, and a written contract. The insurance check matters even more, not less.
Ask for a certificate of insurance sent directly from their insurance agent, not from the contractor. Check that general liability and workers' comp are listed, that the dates cover your project, and that the business name matches. Then call the agent on the certificate and confirm the policy is active. It takes about two minutes and catches lapsed or invented coverage.
Generally, no. In most states the license holder must be the party contracting the work. Employees working for a licensed company are covered by that company's license — that's normal and fine. What's not fine is an independent operator quoting your job under a number issued to a different person or company.
No. A license guarantees minimum qualifications, a paper trail, and a board you can complain to — all valuable, none of them craftsmanship. Plenty of licensed contractors do sloppy work. The license check weeds out the illegal and the disciplined; references, recent jobs you can look at, and a detailed written contract are what sort the good from the merely legal.