How to Transfer Your Plumber License to Illinois (2026)

The Reality of Moving an Out-of-State Plumbing License to Illinois

If you are relocating to Illinois as a journeyman plumber, prepare yourself for a state with strict, highly centralized enforcement. Illinois does not allow out-of-state plumbers to walk across the border and start pulling permits immediately. Plumbing in Illinois is governed primarily at the state level by the Illinois Department of Public Health (IDPH), through its Plumbing Program. Unlike some states where licensing is handled by a general contractor board or a broad department of professional regulation, Illinois keeps plumbing strictly under its public health agency because state law treats proper sanitation as a primary public health defense.

Before you pack your tools, you need to understand that Illinois does not recognize simple reciprocity with most other states. Holding an active journeyman license in Indiana, Missouri, Iowa, or anywhere else does not automatically entitle you to a reciprocal Illinois license. Instead, Illinois evaluates out-of-state plumbers on an individual endorsement and exam basis. You must prove that your past training, supervised work hours, and home state licensing requirements meet or exceed Illinois standards before you are granted approval to take the Illinois Plumbing License Examination.

Additionally, you must navigate a unique regulatory split between the state requirements and the City of Chicago. While the IDPH regulates plumbing throughout the majority of the state, Chicago enforces its own separate plumbing code and municipal licensing structure. If your move takes you to Chicago or certain surrounding Cook County municipalities, you will face distinct steps beyond standard state credentials.

Does Illinois Offer Reciprocity for Out-of-State Plumbers?

The short answer is no, Illinois does not have standard, automatic reciprocal licensing agreements with other states. You cannot simply submit a fee and trade your out-of-state journeyman card for an Illinois card. Instead, the IDPH Plumbing Program reviews out-of-state applicants under an evaluation process to determine if you are eligible to sit for the Illinois state plumbing exam.

To qualify for exam approval as an out-of-state journeyman, you must demonstrate that you completed an apprenticeship or equivalent hands-on experience that mirrors the Illinois requirement. Illinois law requires a minimum of four years (at least 8,000 hours) of practical experience working under the direct supervision of a licensed plumber, combined with approved classroom instruction. If your home state required fewer hours or did not verify direct supervision under a licensed master or journeyman, IDPH will deny your application until those missing hours are accounted for.

• Apprenticeship Verification: You must provide official transcripts or completion certificates from an approved apprenticeship program, such as a UA local joint apprenticeship committee or an accredited trade school.
• Employer Affidavits: You must submit notarized affidavits of experience signed by the licensed plumbers who supervised your work in your previous state. General contractor signatures are not accepted.
• Tax Documentation: IDPH frequently requests W-2 forms or payroll records to verify full-time employment for the hours claimed on your application.
• Verification of Licensure: An official license verification form sent directly from your home state plumbing board to the IDPH, confirming your license status and any disciplinary history.

Step-by-Step: Getting Licensed Through the IDPH

Securing your Illinois plumbing license requires completing a multi-stage application process before you can sit for the mandatory state exam. Plan ahead, as this process can take several months from initial paperwork submission to receiving your physical card.

• Step 1: Contact IDPH and Download Application Forms: Access the Illinois Department of Public Health Plumbing Program site to download the Out-of-State Plumber Application packet. Ensure you have the current edition for 2026.
• Step 2: Compile Your Paperwork: Gather your verified work hours, notarized employer affidavits, apprenticeship certificates, and official state license verifications. Make sure your former employer includes their license numbers and state of issuance on all affidavits.
• Step 3: Submit the Application and Fee: Mail your completed packet to the IDPH Plumbing Program office in Springfield. Application and evaluation fees typically range between $150 and $225. Always check the official IDPH website to confirm current fee amounts.
• Step 4: Await Board Approval: The IDPH reviews applications on a rolling schedule. Expect an evaluation window of 4 to 12 weeks while staff review your credentials and verify out-of-state licenses.
• Step 5: Schedule and Pass the Examination: Once approved, you will receive an exam authorization letter. The Illinois plumbing exam is known for its difficulty and includes both a written section covering the Illinois Plumbing Code and a hands-on practical section (such as copper sweat joints, cast iron assembly, and plan drawing).
• Step 6: Pay Final Licensing Fees: Upon passing the exam, submit your final license issuance fee (typically $100 to $200 annually) to receive your state plumber license.

Chicago vs. Downstate: The Local Licensing Split

One of the most important aspects of working in Illinois is understanding where the IDPH state license applies and where municipal authority takes over. Outside Chicago, the IDPH state plumbing license allows you to perform plumbing work anywhere in Illinois, subject to local permit and registration requirements.

However, the City of Chicago operates under its own municipal plumbing code and issues its own trade licenses through the City of Chicago Department of Buildings. If you plan to work inside the city limits of Chicago, you must hold a Chicago Plumbers License or work under a licensed Chicago Plumbing Contractor. While Chicago and IDPH have historical agreements regarding mutual recognition of exam standards, Chicago maintains separate renewal processes, code provisions, and exam schedules.

Furthermore, Chicago code restricts certain piping materials and techniques that are permitted under the standard Illinois Plumbing Code downstate. For instance, rigid metal pipe and heavy-duty cast iron remain standard requirements in Chicago commercial and residential builds, where PVC or PEX might be allowed under IDPH code in smaller downstate jurisdictions. Always confirm whether your job site falls under standard IDPH jurisdiction or Chicago municipal control before beginning work.

Costs, Timelines, and Exam Logistics

Moving your trade credentials requires budgeting for application fees, exam costs, and lost work time during processing. Here is what out-of-state journeymen should expect when budgeting for an Illinois move:

• Application and Verification Fees: Initial application evaluation ranges between $150 and $250 depending on whether extra verification is required. Confirm exact amounts on the IDPH site.
• Exam Fees: Sitting for the IDPH written and practical exam carries a fee generally between $150 and $300.
• Annual Renewal Fee: Illinois plumbing licenses expire annually (typically April 30th). The annual renewal fee ranges from $100 to $200.
• Processing Timeline: Expect 1 to 3 months for application approval, plus time to schedule the next available exam date. IDPH exams are offered at specific times throughout the year in designated regional testing sites, such as Springfield or Chicago suburb locations.

What People Get Wrong

• Assuming Home State Reciprocity: Thinking your out-of-state license automatically transfers without taking the Illinois written and practical exam.
• Relying on General Contractor Sign-offs: Submitting work history signed by general contractors rather than licensed plumbers who hold valid state credentials.
• Ignoring the Practical Exam: Failing to prepare for the hands-on practical skills portion of the IDPH exam, which requires precise pipe assembly and drawing interpretation under strict time limits.
• Confusing Chicago with Downstate Rules: Working in Chicago on an IDPH state license without registering with the Chicago Department of Buildings or adhering to Chicago local code modifications.
• Working Before Approval: Performing plumbing work in Illinois before your license is fully issued. Illinois actively inspects jobsites and imposes heavy fines for unlicensed work.

Moving to Illinois for Work

Relocating your plumbing career to Illinois takes careful planning, but the state offers strong wages and steady demand across industrial, commercial, and residential sectors. As you plan your move, keep in mind that Illinois features a flat 4.95% state income tax, which simplifies your financial planning regardless of which city or county you settle in.

To simplify your transition, visit the Illinois page on Workmerica. You can access our complete Illinois trade registry guide, review local tax tables, explore verified job openings from employers hiring out-of-state talent, and build a free profile to connect directly with contractors across the state.