- TN-CMCA is the Tennessee Plumbing (CMC-A) Contractor Examination, governed by the Tennessee Board for Licensing Contractors.
- The Prov exam has 100 multiple-choice questions, a 5-hour limit, and requires a 73% passing score.
- It's open-book, using six named references including the 2021 International Plumbing Code.
- Board preapproval ($50) is required before scheduling, plus a $53 Prov exam fee per attempt.
What Is TN-CMCA?
TN-CMCA stands for the Tennessee Plumbing (CMC-A) Contractor Examination - the licensing exam that verifies a plumbing professional has the technical knowledge needed to hold a Class A Mechanical/Plumbing contractor classification in Tennessee. The "CMC-A" designation identifies the plumbing contractor classification tracked by the Tennessee Board for Licensing Contractors, and passing this exam is one of the core requirements for obtaining that license.
Unlike a general trade certificate, TN-CMCA is a state-regulated credential tied directly to legal contracting authority. If you plan to bid, pull permits, or operate as a licensed plumbing contractor in Tennessee, this exam - alongside the separate Tennessee Business and Law exam - sits between you and that authorization. For a full breakdown of eligibility rules before you even get to the exam itself, see our TN-CMCA Requirements 2026 guide.
Who Governs and Administers the Exam
The Tennessee Board for Licensing Contractors sets the licensing rules and classification requirements for Plumbing (CMC-A) contractors. On the testing side, Prov has administered new exam appointments since July 1, 2026, replacing the prior testing vendor. The current Prov candidate bulletin is dated July 13, 2026, and that document governs the exact procedures, content outline, and reference list in effect right now.
Because the Board and the testing vendor are two separate entities, candidates deal with two processes: Board preapproval (confirming you're eligible to sit for the exam) and Prov scheduling (booking and taking the actual test). Skipping ahead to schedule before preapproval is a common early mistake - the Board must clear you first.
Exam Format, Timing, and Scoring
The TN-CMCA exam is open-book, computer-based, and built from multiple-choice questions. Here's what candidates are working with on test day:
- 100 questions covering all 12 content domains
- 5-hour time limit - roughly three minutes per question on average, though open-book lookups eat into that
- 73% passing score required to pass
- Open-book format using a defined list of approved references
- Test-center or remote Examroom delivery, giving candidates flexibility in how they sit for the exam
The open-book element is a double-edged sword. It removes the need to memorize every code section word-for-word, but it also means the exam expects you to know exactly where to find answers quickly under time pressure. Candidates who haven't practiced navigating the references beforehand often run out of time, not knowledge. For a deeper look at how this format affects overall difficulty, read How Hard Is the TN-CMCA Exam? Complete Difficulty Guide 2026. And for the exact math behind the passing threshold, see TN-CMCA Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Open-book doesn't mean easy - it means the exam rewards familiarity with your references, not just raw memorization. Practice locating answers in the IPC and other listed sources before test day.
The 12 Content Domains
TN-CMCA questions are drawn from twelve distinct content domains, each representing a real slice of plumbing contractor knowledge. Understanding how these are weighted helps you prioritize study time rather than treating every topic equally.
Domain 11: Drain, Waste, and Vent Systems (20%)
The single largest domain on the exam. Candidates must understand pipe sizing, venting configurations, trap requirements, and how DWV systems interact with code minimums.
- Master vent sizing tables and fixture unit calculations
Domain 9: Isometrics (18%)
The second-heaviest domain, testing your ability to read and interpret isometric plumbing drawings - a skill that's visual and spatial rather than purely code-based.
- Practice tracing pipe runs through isometric diagrams under time pressure
The remaining ten domains - General Knowledge, Plumbing Math, Code Requirements, Fixtures and Fittings, Water Heaters, Storm Drainage, Fuel Gas Systems, OSHA Safety, Water Supply and Distribution, and Tools and Installation Practices - round out the remaining exam weight. None of these carry the same individual weight as the top two, but collectively they represent the majority of the test, so none can be skipped in preparation.
For a domain-by-domain breakdown with specific study focus for each of the twelve areas, our TN-CMCA Exam Domains 2026: Complete Guide to All 12 Content Areas covers each one in depth.
Registration, Preapproval, and Fees
Getting to test day for TN-CMCA involves more than paying an exam fee. The process has distinct financial and documentation checkpoints:
- Board preapproval fee: $50 - required before you can even schedule the exam
- Experience documentation: at least three years of plumbing experience, or a degree in plumbing or mechanical engineering
- Prov exam fee: $53 per attempt - paid when you schedule the actual test
- Tennessee Business and Law exam: a separate exam that must also be passed
- Additional application requirements: financial-capacity documentation, references, liability insurance, and workers' compensation coverage
- Score validity: exam scores are typically valid for two years
- Initial contractor application fee: $250, with license renewal every two years at $200
These fees add up quickly and they're separate from any preparation resources you invest in. For the complete cost picture across every stage - preapproval, exam, application, and renewal - see TN-CMCA Certification Cost 2026: Complete Pricing Breakdown. If you're not yet sure you meet the underlying eligibility criteria, start with TN-CMCA Requirements 2026 before spending on preapproval.
Who Actually Takes This Exam
TN-CMCA candidates are typically working plumbers looking to move from employee to licensed contractor status. This usually means:
- Journeyman-level plumbers with three-plus years of field experience who want to start or legally operate their own contracting business
- Foremen or lead plumbers at existing companies who need the license to sign permits and bid larger jobs
- Plumbing or mechanical engineering degree holders entering contracting from a more technical or design-oriented background
- Business partners or estate/family members taking over an existing plumbing company who need a qualifying license holder
Because the CMC-A license is what allows someone to legally contract plumbing work in Tennessee, employers, general contractors, and property developers all care whether the person signing a plumbing bid actually holds this credential. That's a large part of why candidates pursue it - for a full look at how the license translates into career and income opportunity, see TN-CMCA Salary Guide 2026: Complete Earnings Analysis and Is the TN-CMCA Certification Worth It? Complete ROI Analysis 2026. If you're researching where licensed contractors find work after certifying, TN-CMCA Jobs covers that angle too.
Mapping a Study Plan to the Domains
Rather than studying every domain evenly, an efficient TN-CMCA plan front-loads the highest-weighted material and treats reference navigation as its own skill.
Drain, Waste, and Vent Systems + Isometrics
- Since these two domains cover 38% of the exam combined, start here and drill isometric drawing interpretation daily
Code Requirements, Water Supply, Fixtures
- Practice locating answers in the 2021 International Plumbing Code under a timer to simulate open-book pressure
Fuel Gas Systems, Water Heaters, Storm Drainage
- Cross-reference the 2018/2021 International Fuel Gas Code sections most likely to appear
OSHA Safety, Plumbing Math, General Knowledge, Tools
- Review OSHA 29 CFR Part 1926 basics and run full-length timed practice exams
This kind of scheduling only works if you know exactly what's tested in each domain - our TN-CMCA Study Guide 2026: How to Pass on Your First Attempt lays out a more detailed week-by-week approach, and you can pressure-test your readiness using realistic questions on our TN-CMCA practice test platform. For a condensed, last-week review of must-know facts across all 12 domains, keep the TN-CMCA Cheat Sheet 2026 handy.
Quick Facts Table
| Item | Detail |
|---|---|
| Governing body | Tennessee Board for Licensing Contractors |
| Test administrator | Prov (since July 1, 2026) |
| Format | Open-book, computer-based, multiple-choice |
| Questions / Time limit | 100 questions / 5 hours |
| Passing score | 73% |
| Exam fee | $53 per attempt (Prov) |
| Board preapproval fee | $50 |
| Delivery options | Test center or remote Examroom |
| Score validity | Typically 2 years |
| Initial license application | $250 |
| License renewal | Every 2 years, $200 |
Every figure above comes directly from the current Prov bulletin and Board requirements - nothing here is estimated. For deeper context on how the passing score and question difficulty interact, revisit TN-CMCA Passing Score 2026, and for data-driven insight on how candidates actually perform, see TN-CMCA Pass Rate 2026: What the Data Shows.
Frequently Asked Questions
TN-CMCA stands for the Tennessee Plumbing (CMC-A) Contractor Examination, the licensing exam governed by the Tennessee Board for Licensing Contractors for the Plumbing Class A contractor classification.
Yes. Candidates may use listed references including the 2021 International Plumbing Code, the 2018 or 2021 International Fuel Gas Code, Mathematics for Plumbers and Pipefitters (8th Edition), OSHA 29 CFR Part 1926, and Plumbing Basics for Contractors (4th Edition).
The exam has 100 multiple-choice questions with a 5-hour time limit, and you need a 73% score to pass.
Yes. Board preapproval is required before scheduling, carries a separate $50 fee, and requires proof of at least three years of plumbing experience or a relevant plumbing/mechanical engineering degree.
No. Applicants must also pass the separate Tennessee Business and Law exam and satisfy financial-capacity, reference, liability-insurance, and workers' compensation requirements before licensure.