Plumber License Requirements in Illinois
| Licensing Authority | Illinois Department of Public Health (IDPH) |
| License Type | Licensed Plumber / Plumbing Contractor Registration |
| Experience Required | Must be employed as a licensed apprentice plumber for a minimum of 4 years. Must have completed at least 2 years of high school or equivalent, plus an approved course of instruction through a college, university, or trade school. |
| Education Substitute | Completion of an approved college, university, or trade school plumbing program is required in addition to (not as a substitute for) the 4-year apprenticeship. Chicago plumber license holders may apply for a state license without examination via reciprocity. |
| Exam Required | Yes — Written Section + Drawing Section + Practical Section |
| Bond Required | Yes — $20,000 |
| Insurance | General liability: required. Workers comp: required with employees |
| Continuing Education | 4 hours every year |
| Processing Time | Submit application at least 30 days before exam date. Overall process varies. |
Fee Breakdown
| Application Fee | $175 |
| Exam Fee | $175 |
| Initial License Fee | $150 |
| Apprentice license | $50 |
| Apprentice renewal | $100 |
| Plumbing Contractor registration | $150 |
| Plumbing Contractor renewal | $150 |
| Chicago/out-of-state exam application | $225 |
| Est. Initial Total | $1,175 |
Renewal: $150 every 1 year (expires April 30)
Exam Requirements
Written Section
55 questionsPass: 61% minimum on each section, 75% overall to pass
Illinois Plumbing Code
Drawing Section
Pass: 61% minimum on each section, 75% overall to pass
2-3 story building DWV system designPlumbing fixture layout
Practical Section
Pass: 61% minimum on each section, 75% overall to pass
Copper and cast iron pipingPVC piping project
Exam provider: Administered by IDPH
License Tiers
Apprentice Plumber
Entry level — must be sponsored by licensed plumber or in approved apprenticeship program
Exam: Not required
Licensed Plumber
4 years as licensed apprentice + approved coursework
Exam: Required
Plumbing Contractor
Must hold a valid Illinois plumber license first
Exam: Not required
Notes
- Plumbing is regulated by IDPH, NOT by IDFPR
- Exams are offered on scheduled dates — check IDPH website for upcoming dates
- Chicago plumber license holders may obtain state license without exam via reciprocity
- Plumbing Contractor registration is separate from and in addition to the individual plumber license
- IDPH address: 525 W. Jefferson St., 3rd Floor, Springfield, IL 62761
Frequently Asked Questions
Do I need a plumber license in Illinois?
Yes, Illinois requires a statewide plumber license through the Illinois Department of Public Health.
How much does a plumber license cost in Illinois?
The estimated initial cost is $500, including application, exam, and license fees.
Data last verified: 2026-04-02 | Source: IDPH