Licensing is the single biggest source of confusion in the skilled trades — because the honest answer to "what are the requirements?" is: it depends on the state, the trade, and whether you're an employee or the contractor. This map gives you the pattern, the exceptions that matter, and the exact agency to check for your state. The trade-specific guides go deeper.
The three licensing patterns
Almost every trade license in America fits one of these shapes:
- Statewide tiered license — apprentice → journeyman → master, each tier with hour requirements and exams. Standard for plumbing statewide; common for electrical.
- Contractor-only state license — the state licenses the business/contractor (who signs contracts and pulls permits); employees work under that umbrella. California's electrician certification is the strict variant (even employees must be certified), while most contractor-license states don't require it for workers.
- Local licensing — no statewide license; cities and counties issue their own. Famous examples: electricians in much of New York State (outside NYC's strict master/special-electrician system) and Texas journeyman electricians (registered locally, statewide license only for contractors/masters).
Trade by trade: who licenses what
Electricians
A majority of states run some statewide electrical licensing, but a meaningful set — including New York, Pennsylvania, Illinois (outside Chicago's strict system), Kansas, Missouri, and Wyoming — leave it to municipalities. Contractor licenses are statewide nearly everywhere. Details: electrician license requirements by state.
HVAC
Statewide contractor licenses exist in most states; technician-level work frequently needs no license at all. The one federal rule every HVAC worker touches: EPA Section 608 certification to handle refrigerants — no exceptions, in all 50 states. Details: HVAC license requirements and EPA 608 explained.
Plumbers
The most consistently statewide trade: apprentice → journeyman → master structures dominate, with contractor licensing on top. Even here, states like New York leave journeymen to local rules. Details: plumber license requirements by state.
Notary public
Not a trade, but the lowest-barrier credential on this site — and 100% statewide, with wildly different rules: some states require exams and education (California), others just a bond and a form (Florida, Texas). Notary commissions also unlock loan-signing income. Guides: Texas, California, Florida.
CNA (Certified Nursing Assistant)
The only universally licensed credential here — because federal law ties nursing-home funding to certified staffing. Every state maintains a CNA registry; training hour minimums vary (federal floor: 75 hours). Details: CNA certification requirements.
The two rules that trip everyone up
Rule 1 — employee vs contractor changes everything. Before planning a licensing path, decide whether you'll work for someone else or run jobs. Contractor tiers cost more, insure more, and test more — but they're also where the income is.
Rule 2 — the agency page is the truth. Guides (including ours) go stale; the issuing agency doesn't. The pattern on this site: we explain the path and cite the agency — TDLR for Texas trades, Florida DBPR for Florida contracting, California DIR for electrician certification, your state health department for CNA — and you verify dates and fees there before paying anything.
Where to go next
Pick your trade: electrician · HVAC · plumbing · notary · CNA. Each guide includes costs, realistic timelines, and the exam structure.
This site is general information, not legal or career advice. Licensing rules change; verify with the official agency for your state before enrolling in training or paying fees.
Frequently asked questions
Which trades require a license in every state?
Very few. Almost every state licenses electrical and plumbing contractors at some level, but several states have no statewide journeyman electrician license (licensing happens at the city or county level instead). HVAC contractor licensing is statewide in most states, while technician-level HVAC work often needs no state license. CNA certification is required everywhere — it is federally tied to nursing-home reimbursement.
Where do I verify my state's actual requirement?
Always the issuing agency: state licensing departments (for example TDLR in Texas, DBPR in Florida, DIR in California), the state electrical/plumbing boards, or the state health department for CNA certification. Every guide on this site links the official source, and the agency page always outranks any guide — including ours.
Do I need a license to work as an employee under someone else's?
Often no. Many states only require a license for the contractor who signs contracts and pulls permits, not for employees working under supervision — but some states do require even journeyman-level employees to be registered or certified (California is the strict example for electricians). Check your state's rule before assuming.
What happens if I work without a required license?
It ranges from fines and misdemeanors to felony charges, plus a near-universal ban on enforcing contracts you signed unlicensed — meaning customers can refuse to pay. Unlicensed contracting in disaster areas is prosecuted aggressively in states like Florida and Texas.