Home / Plumbers / Illinois / License

How much experience do you need in Illinois?
At least 4 years as a licensed apprentice plumber, 2 years of high school or equivalent, and an approved course of instruction3
Keep your own record of hours, employers and pay stubs. IDPH can ask for proof when you apply.
What is the Illinois plumber exam like?
You take the state exam once the board approves your hours. No outside testing company. The Illinois Department of Public Health prepares and gives the plumber license exam itself.12
How much does the plumber license cost?
Plumber exam application: $175 (Illinois licensed apprentice) or $225 (Chicago or out-of-state licensed); plumbing contractor registration: $150 per year3
How do you renew it?
Plumber and apprentice licenses renew every year by April 30.1 Continuing education: 4 hours of approved continuing education at each annual renewal after the first.4
Does a license from another state count in Illinois?
A plumber licensed in another state or municipality may be licensed without the exam if the Board finds the requirements substantially equal and the other state reciprocates; applicant must be 21 or older.5
License levels in Illinois
Apprentice Plumber (age 16+); Plumber; Plumbing Contractor (annual registration); Irrigation Contractor; Retired Plumber.
Applications, exam booking and hour forms are on IDPH's site.
More for plumbers in Illinois
Sources
- Illinois Department of Public Health (IDPH), Plumbing Program: exam (dph.illinois.gov, 2026-10-27)
- Illinois Department of Public Health (IDPH), Plumbing Program: exam provider (ilga.gov, 2026-10-28)
- Illinois Department of Public Health (IDPH), Plumbing Program: experience (dph.illinois.gov, 2026-10-27)
- Illinois Department of Public Health (IDPH), Plumbing Program: continuing education (ilga.gov, 2026-10-27)
- Illinois Department of Public Health (IDPH), Plumbing Program: reciprocity (ilga.gov, 2026-10-27)