Plumbing is the most consistently licensed of the major trades: nearly every state runs the apprentice → journeyman → master structure statewide, with contractor licensing layered on top. That consistency makes the path easier to plan — but the hour counts, code editions, and exam bodies still vary state to state. Here's the map and the pattern.
The universal plumbing pattern
1. Apprentice. Registered with the state or a US DOL–approved program (UA/union apprenticeships, ABC, or merit-shop programs). Roughly 4,000–8,500 supervised hours plus classroom hours (commonly a few hundred) over about two to five years. Union programs are structured around five years by design; the license requirement itself is usually less.
2. Journeyman. The working-license tier: an exam on the state's adopted plumbing code — the UPC (Uniform Plumbing Code) in many states, the IPC (International Plumbing Code) in others; knowing which one your state uses is half your exam prep — plus theory, administered via PSI, ICC, or the state board itself.
3. Master / contractor. Additional documented years as a journeyman (commonly one to two+), a master or contractor exam, and for contractors: business-and-law testing, insurance, bonding, and permit rights. The master tier in many states is also what qualifies you to supervise apprentices.
The states that break the pattern
- New York — no statewide journeyman plumbing license; licensing is local (NYC's master plumber license is famously demanding), while working patterns elsewhere in the state vary by county.
- Contractor-only layers — several states license the contractor statewide but leave journeyman-tier rules to municipalities.
- Reciprocity pockets — groups of neighboring states honor each other's journeyman licenses; if you're near a border, check both boards before choosing where to test.
What the license actually costs
| Stage | Typical cost |
|---|---|
| Apprenticeship | $0–$1,500/yr (union programs near-free; schools vary widely) |
| Journeyman exam + license | $50–$350 |
| Master/contractor exam + license | $100–$500 |
| Bond + insurance (contractor tier) | $500–$3,000+/yr |
As with electricians, the exam fees are small; the training route is where costs diverge. Union apprenticeship dominates on value — paid hours, structured code classes, and automatic documentation.
Verify your state in five minutes
- Search
your state + plumbing licenseand open the.govboard page (state plumbing board or licensing department). - Confirm: statewide journeyman license or local? Which code (UPC or IPC)? Exact hours for journeyman?
- Note the exam administrator and whether your hours must be under a licensed master (some states require it) or a licensed plumber generally.
The companion guides: how to become a plumber covers the entry path and first-year decisions; the trade license map covers the other trades.
General information, not career or legal advice. Hour counts, code adoptions, and exam structures change — verify with your state plumbing board before registering.
Frequently asked questions
Do plumbers need a license in every state?
Plumbing has the most consistent statewide licensing of the major trades: nearly every state requires a license for journeyman-level and contractor work, with the familiar apprentice-to-journeyman-to-master structure. The notable exception pattern is local licensing for journeymen in a few states (New York is the classic example), while contractor licenses remain statewide almost everywhere.
How many hours does a plumbing apprenticeship require?
Commonly in the range of 4,000 to 8,500 supervised hours (about two to four-plus years full-time) plus classroom hours, depending on state and program. Union plumbing apprenticeships run about five years by design. Your state plumbing board publishes the exact number — it changes, so verify there.
Can I do my own plumbing without a license?
Most states exempt homeowners working on their own primary residence from licensing, though permits are still required for significant work like repiping or sewer lines. The exemption does not extend to rental properties or homes for sale — that's contracting, and unlicensed contracting carries fines and unenforceable contracts.
What exams do plumbers take?
Journeyman and master exams test the plumbing code adopted by the state (based on the UPC or IPC depending on the state) plus theory, administered through providers like PSI, ICC, or state boards. Contractor tiers add a business-and-law exam in most states.