Iowa Department of Inspections · checked 2026-10-21
Iowa Plumber License Requirements
Statewide journeyperson, master and contractor licenses in the plumbing discipline under Iowa Code chapter 105, which covers plumbing and mechanical systems (HVAC, refrigeration, sheet metal and hydronic). Contractor (plumbing): 4 years of experience at minimum, plus an exam.
- 1J · Journeyperson (plumbing) 4 years
- 2M · Master (plumbing) 4 years after the prior level
- 3C · Contractor (plumbing) 4 years after the prior level
License levels in Iowa
The Iowa path has 3 steps on this page: Journeyperson (plumbing), Master (plumbing) and Contractor (plumbing). The source states the time in years.
| Level | Experience | Classroom | Time from start | Exam | Fees |
|---|---|---|---|---|---|
| J Journeyperson (plumbing) | 4 years | — | 4 years | Yes | Not printed |
| M Master (plumbing) | none stated | — | 4 years after the prior level | Yes | Not printed |
| C Contractor (plumbing) | none stated | — | 4 years after the prior level | Not stated | Not printed |
Journeyperson (plumbing) (J)
Evidence of at least four years of practical experience as an apprentice, then the state journeyperson licensing exam in the plumbing discipline. Source: Iowa Code § 105.18, Plumbing and mechanical licenses.
Master (plumbing) (M)
Evidence of prior licensure as a journeyperson or master in the discipline, the education and experience the board sets by rule (no figure in the statute), and the state master exam. Source: Iowa Code § 105.18, Plumbing and mechanical licenses.
Contractor (plumbing) (C)
Hold a master license in the discipline or employ at least one master license holder, and maintain a permanent place of business. The statute names no exam or experience of its own for the contractor license. Source: Iowa Code § 105.18, Plumbing and mechanical licenses.
Exam
2 of the 3 levels listed here require an exam: Journeyperson (plumbing) and Master (plumbing). The source does not print a pass mark.
Fees
The Iowa source read prints no dollar amounts for this license. Iowa Code § 105.18 prints no fees.
Reciprocity
The Iowa sources read for this trade name no reciprocity agreement and no route for out-of-state licensees.
How Iowa compares
Iowa's source gives 4 years for the contractor (plumbing) on top of the earlier level, but no time for the earlier level itself, so the full path cannot be ranked against other states.
Same trade elsewhere: California · Texas · Florida · Illinois · Ohio. All states side by side: Plumber license requirements by state.
Other trades in Iowa
- Electrician: Class A master electrician: 1 year of experience at minimum, plus an exam.
- HVAC: Contractor (HVAC): 4 years of experience at minimum, plus an exam.
- General contractor: Iowa uses a contractor registration for general contractors, not a skills license.
All covered trades on one page: Iowa trade licenses.
Background reading: From apprentice to master: how long each state takes · How trade license exams work.
Questions
Who issues the plumber license in Iowa?
Iowa Department of Inspections, Appeals, and Licensing (DIAL), Plumbing and Mechanical Systems Board. Statewide journeyperson, master and contractor licenses in the plumbing discipline under Iowa Code chapter 105, which covers plumbing and mechanical systems (HVAC, refrigeration, sheet metal and hydronic).
How long does it take to qualify for the Contractor (plumbing) in Iowa?
4 years by this site's count, plus however long the earlier level takes. Hold a master license in the discipline or employ at least one master license holder, and maintain a permanent place of business. The statute names no exam or experience of its own for the contractor license.
Does Iowa have plumber license reciprocity?
The Iowa sources read name no reciprocity agreement for this trade.
Sources and last checked
| What | Source | Checked |
|---|---|---|
| Issuing authority | Iowa Department of Inspections, Appeals, and Licensing (DIAL), Plumbing and Mechanical Systems Board | 2026-10-21 |
| J requirements | Iowa Code § 105.18, Plumbing and mechanical licenses | 2026-10-21 |
| M requirements | Iowa Code § 105.18, Plumbing and mechanical licenses | 2026-10-21 |
| C requirements | Iowa Code § 105.18, Plumbing and mechanical licenses | 2026-10-21 |
| Law cited | Iowa Code §§ 105.2, 105.18 | 2026-10-21 |
This page summarises what the Iowa source said on 2026-10-21. It is general information, not legal advice; the board's own page and the statute are the authority and can change. Confirm with Iowa Department of Inspections before applying. The free official route is the board itself: its page, application forms and staff answer eligibility questions.