If you’re preparing to become a licensed plumbing contractor in Michigan, one of the first things you’ll likely ask is: “How many questions are on a plumbing contractors license in Michigan?” It’s a smart question—knowing the exam structure helps you study smarter, not harder. Whether you’re a seasoned plumber or just starting your journey toward licensure, this guide gives you the clear, accurate, and up-to-date details you need to walk into that test center with confidence.
What Is the Michigan Plumbing Contractor License Exam?
Before diving into the number of questions, it’s important to understand what the exam actually covers. In Michigan, the Plumbing Contractor License is regulated by the Department of Licensing and Regulatory Affairs (LARA). The exam is designed to assess both your technical plumbing knowledge and your understanding of Michigan-specific plumbing codes and business practices.
The test is split into two main sections:
Trade Knowledge (Plumbing)
Business and Law
Both sections must be passed to obtain your license.
How Many Questions Are on the Michigan Plumbing Contractor Exam?
You’ll have 4 hours to complete the entire exam, which is administered via computer at a PSI testing center.
💡 Pro Tip: While 100 questions may sound daunting, most candidates finish with time to spare if they’ve prepared properly. Focus on mastering core concepts rather than memorizing every code line.
What Topics Are Covered in the Trade Knowledge Section?
The 75 trade questions test your hands-on plumbing expertise. According to LARA and PSI’s official content outline, key topics include:
Water supply and distribution systems (e.g., pipe sizing, pressure requirements)
Drainage, waste, and vent (DWV) systems
Fixture installation and requirements
Backflow prevention and cross-connection control
Gas piping systems (if applicable to your scope)
Michigan-specific amendments to the IPC (International Plumbing Code)
For example, you might see a question like: “What is the minimum trap size for a kitchen sink in a residential dwelling per Michigan code?”
The 25 business and law questions focus on your ability to run a compliant plumbing business in Michigan. Topics include:
Licensing requirements and renewal procedures
Contractor responsibilities and liability
Workers’ compensation and insurance rules
Michigan’s Home Improvement Consumer Protection Act
Permitting and inspection processes
This section ensures you’re not just skilled with a wrench—but also legally and ethically equipped to manage clients, employees, and projects.
⚖️ Did You Know? Over 30% of first-time applicants fail the Business and Law section—not because they lack plumbing skills, but because they underestimate this portion. Don’t skip it!
What’s the Passing Score?
To pass the Michigan plumbing contractor exam, you must score at least 70% overall, with no sub-score below 65% in either section. That means:
At least 53 correct answers out of 75 in Trade Knowledge
At least 17 correct answers out of 25 in Business and Law
If you fail one section but pass the other, you only need to retake the failed part within one year.
How to Prepare Effectively: A Step-by-Step Guide
Follow these proven steps to maximize your chances of passing on the first attempt:
Step 1: Verify Your Eligibility
You must have at least 4 years of full-time plumbing experience (or equivalent education + experience) under a licensed contractor. Submit your application to LARA before scheduling the exam.
Step 2: Get the Right Study Materials
Use resources aligned with the 2021 Michigan Plumbing Code. Recommended materials include:
Michigan Plumbing Contractor Exam Prep by Contractor Campus
PSI’s Official Candidate Information Bulletin
Online practice tests from reputable providers (e.g., RedVector, Zephyr)
Step 3: Take Practice Exams Under Timed Conditions
Simulate real test conditions: 100 questions in 4 hours. Analyze your weak areas—especially gas piping or venting if those trip you up.
Step 4: Review Michigan-Specific Rules
National codes are a foundation, but Michigan has unique amendments. For instance, the state requires backflow preventers on all irrigation systems—a detail often tested.
Step 5: Schedule Your Exam Early
Testing centers fill up fast. Once approved by LARA, schedule your exam through PSI Exams.
📌 Note: Bring two forms of ID and your approval letter. No personal items (including phones) are allowed in the testing room.
Common Mistakes to Avoid
Even experienced plumbers stumble on these pitfalls:
Assuming national code = Michigan code → Always check for state amendments.
Ignoring the Business section → It’s shorter but critical.
Cramming the night before → Space out study over 4–6 weeks for better retention.
Misreading questions → Watch for words like “NOT” or “EXCEPT.”
Michigan vs. Other States: A Quick Comparison
State
Total Questions
Trade Questions
Business/Law
Passing Score
Michigan
100
75
25
70%
Ohio
100
80
20
70%
Illinois
100
75
25
70%
Florida
100
60
40
75%
While many states follow a similar structure, Michigan places strong emphasis on local code compliance—so don’t rely on out-of-state prep books alone.
Why Licensing Matters: Beyond the Exam
Becoming a licensed plumbing contractor in Michigan isn’t just about passing a test—it’s about public safety, professional credibility, and legal operation. Unlicensed work can result in fines up to $5,000 per violation and voided insurance claims.
Moreover, licensed contractors earn 20–30% more on average, according to industry reports from the U.S. Bureau of Labor Statistics. Clients trust licensed professionals—and so do banks and municipalities when issuing permits.
Q1: How long does it take to get approved to take the exam?
A: After submitting your application and proof of experience to LARA, processing typically takes 2–4 weeks. Apply early to avoid delays.
Q2: Can I take the exam without a sponsoring contractor?
A: Yes—if you’re applying as a contracting business owner. However, you still need documented experience under a licensed plumber.
Q3: Is the exam open-book?
A: No. The Michigan plumbing contractor exam is closed-book. You cannot bring notes, codebooks, or devices into the testing room.
Q4: How much does the exam cost?
A: The application fee is $129, and the exam fee is $107, paid to PSI. Retakes cost $107 per section.
Q5: Are there continuing education requirements?
A: Not for initial licensure, but renewal every 3 years requires proof of active work and compliance with state laws.
Q6: Can I work as a plumber in Michigan without this license?
A: You can work as a journeyman under a licensed contractor, but you cannot pull permits or run your own plumbing business without the contractor license.
Conclusion
Now you know exactly how many questions are on a plumbing contractors license in Michigan: 100 total, split between technical plumbing and business law. With the right preparation, this exam is very passable—even on your first try.
Remember: Success isn’t just about knowing pipes—it’s about understanding the rules that keep Michigan’s water systems safe and reliable. If you found this guide helpful, share it with a fellow plumber or apprentice on social media! 👷♂️💧
Got more questions? Drop them in the comments below—we’re here to help you build a licensed, thriving plumbing career in the Great Lakes State.
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