Scroll any contractor's website and you will see the same three-word phrase: licensed and insured. It sounds reassuring, but most homeowners could not tell you what either word actually guarantees. They protect against very different things — and it is entirely possible (and common) to be one without the other.
What a license actually is
A contractor's license is a government-issued credential that says: this person has passed an exam, proved trade competency, and agreed to follow a specific code of conduct. If they violate that code, the state board can suspend or revoke their ability to work.
Licenses are trade-specific and state-specific. A California Class C-36 plumbing license is not valid in Nevada. A general contractor's license does not automatically cover electrical, HVAC, or roofing. When a pro says they are "licensed," your first question should be: licensed for what, in which state?
What insurance actually is
Insurance is a private contract between the contractor and an insurer. It kicks in when something goes wrong. There are two policies that matter for you:
- General liability covers damage the pro causes to your property (water damage, fire, dropping a toolbox through a skylight). Minimum useful coverage is $1M.
- Workers' compensation covers the pro and their crew if they get hurt on your property. Without it, you can be personally liable for medical bills under most state laws.
The four combinations
- Licensed + insured — the baseline. Still not a guarantee of quality, but at least the floor is real.
- Licensed, not insured — legal in some states for small jobs, but you are the insurance policy. Avoid.
- Insured, not licensed — often a tell that someone is working outside their trade. A roofer with liability insurance is still not qualified to rewire your kitchen.
- Neither — walk away. Every warning sign this article raises applies double.
How to actually verify
Do not trust the website badge. Trust the source.
- Search the state license board for the business name or license number.
- Ask for the certificate of insurance (COI) emailed directly from the insurer, not a PDF the pro has on file.
- Confirm the coverage dates — a COI from 14 months ago is worthless.
Or skip all of that: every pro on our verified pros list has been checked on license, insurance, identity, and background before they can take a single booking. See the how it works page for the full verification stack.
The honest truth
License proves competence on paper. Insurance covers the things competence cannot prevent. You want both — and you want them verified by someone other than the contractor's own marketing page.