- TN-CMCA Exam Overview: Format, Fees, and Scheduling
- Board Preapproval and Eligibility Before You Register
- Domain-by-Domain Breakdown: What Actually Gets Tested
- The Open-Book References You Must Know Cold
- A Six-Week Study Timeline Built Around the Weighting
- Test-Day Mechanics: Remote vs. Test Center
- After You Pass: License, Business and Law, and Renewal
- FAQ
- The exam is 100 questions, open-book, with a 5-hour limit and a 73% passing score.
- Drain, Waste, and Vent Systems (20%) and Isometrics (18%) carry the heaviest weight - study these first.
- Board preapproval ($50) and at least three years of plumbing experience are required before you can even schedule.
- The Prov exam fee is $53 per attempt, and scores are typically valid for two years.
TN-CMCA Exam Overview: Format, Fees, and Scheduling
The Tennessee Plumbing (CMC-A) Contractor Examination, referred to throughout this guide as TN-CMCA, is administered under the authority of the Tennessee Board for Licensing Contractors. Since July 1, 2026, Prov has handled all new exam appointments, and the current Prov candidate bulletin is dated July 13, 2026 - always confirm you're studying from the latest version before you register.
Structurally, the exam is straightforward but unforgiving on detail: 100 multiple-choice questions, a 5-hour time limit, and a 73% passing score required to earn your CMC-A credential. It is open-book, which changes your prep strategy significantly compared to a closed-book test - you're not memorizing every code section, but you do need to know exactly where to find the right table, formula, or clause under time pressure. The Prov fee is $53 per attempt, separate from the Board's preapproval fee discussed below.
For a deeper look at how these numbers compare to other trade exams and what "hard" actually means in context, see How Hard Is the TN-CMCA Exam? Complete Difficulty Guide 2026. If you want the exact scoring mechanics spelled out, read TN-CMCA Passing Score 2026: Exactly What You Need to Pass.
Board Preapproval and Eligibility Before You Register
You cannot simply pay Prov and sit for the TN-CMCA. The Tennessee Board for Licensing Contractors requires preapproval before scheduling, which carries its own separate $50 fee. To get that preapproval, you need documentation of at least three years of plumbing experience, or a degree in plumbing or mechanical engineering.
Beyond the experience requirement, a full contractor application involves several supporting pieces that have nothing to do with plumbing knowledge but everything to do with getting licensed:
- Proof of financial capacity
- References attesting to your work history
- Liability insurance documentation
- Workers' compensation coverage (where applicable)
- A completed application meeting all Board criteria
You'll also need to pass the separate Tennessee Business and Law exam - this is not part of the 100-question CMC-A trade exam, but it's a mandatory companion requirement before a license is issued. A full walkthrough of every prerequisite, document, and timeline lives at TN-CMCA Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Start the preapproval paperwork weeks before you plan to study intensively - the $50 preapproval process has its own timeline, separate from the $53 exam fee, and can stall your schedule if submitted late.
Domain-by-Domain Breakdown: What Actually Gets Tested
The TN-CMCA covers twelve content areas, and not all of them deserve equal study time. Two domains stand out as the biggest point sources on the exam: Drain, Waste, and Vent Systems at 20% and Isometrics at 18%. Together they represent nearly two-fifths of the entire exam, which means a candidate who masters these two areas and is merely competent elsewhere has a realistic shot at clearing 73%.
Domain 11: Drain, Waste, and Vent Systems
This is the single largest domain on the exam. Expect questions on pipe sizing, venting configurations, trap arrangements, and fixture unit calculations tied directly to the International Plumbing Code.
- Fixture unit loading and horizontal branch sizing
- Vent stack and stack vent sizing rules
- Trap seal protection and distance-to-trap limits
Domain 9: Isometrics
Isometric drawing interpretation questions test your ability to read a plumbing riser diagram and identify errors, missing fittings, or code violations at a glance.
- Reading pipe runs, offsets, and fitting symbols correctly
- Spotting improper vent or drain routing on a drawing
- Translating a 2D isometric into real-world 3D pipe layout
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 - each carry smaller individual weight but collectively make up the majority of remaining questions, so none can be skipped entirely. For a complete section-by-section treatment of all twelve areas with study priorities for each, see TN-CMCA Exam Domains 2026: Complete Guide to All 12 Content Areas.
| Domain | Relative Weight | Study Priority |
|---|---|---|
| Drain, Waste, and Vent Systems | 20% (largest) | Highest - master fixture units and venting |
| Isometrics | 18% (second largest) | Highest - practice reading riser diagrams daily |
| Fuel Gas Systems | Moderate | Cross-reference IFGC editions carefully |
| OSHA Safety | Moderate | Focus on 29 CFR Part 1926 excavation/trenching rules |
| Remaining 8 domains | Smaller individually, large combined | Steady daily review, don't neglect |
The Open-Book References You Must Know Cold
Because the TN-CMCA is open-book, your success depends heavily on your familiarity with a specific set of permitted references - not on outside memorization. The listed references are:
- 2021 International Plumbing Code
- 2018 or 2021 International Fuel Gas Code
- Mathematics for Plumbers and Pipefitters, 8th Edition
- OSHA 29 CFR Part 1926
- Plumbing Basics for Contractors, 4th Edition (2021)
Every one of these should be in your possession, tabbed, and physically annotated (or digitally bookmarked, if testing via Examroom) well before test day. The math book is easy to underestimate - Plumbing Math is a distinct domain, and questions drawing on pipe volume, slope, and offset calculations move faster when you already know which chapter houses the relevant formula rather than searching cold during the exam.
A Six-Week Study Timeline Built Around the Weighting
Generic study techniques only matter if they're pointed at the right targets. Given that Drain, Waste, and Vent Systems and Isometrics together account for 38% of the exam, your calendar should front-load those two domains rather than moving through all twelve in equal, alphabetical chunks.
Drain, Waste, and Vent Systems
- Work through IPC fixture unit tables until sizing is automatic
- Drill venting configurations and trap distance rules
Isometrics
- Practice reading and redrawing riser diagrams daily
- Identify common fitting and slope errors in sample drawings
Code Requirements, Fixtures and Fittings, Water Heaters, Water Supply and Distribution
- Cross-reference IPC sections with Plumbing Basics for Contractors
- Build a personal index of frequently cited code tables
Fuel Gas Systems, OSHA Safety, Storm Drainage, Plumbing Math
- Confirm your IFGC edition and tab key clearance/venting tables
- Review 29 CFR Part 1926 trenching and excavation sections
General Knowledge, Tools and Installation Practices, Full Review
- Take timed 100-question practice runs against a 5-hour clock
- Re-tab any reference sections that slowed you down
If you want a condensed version of every must-know fact to review the night before your appointment, bookmark TN-CMCA Cheat Sheet 2026: One-Page Review of Must-Know Facts. And for repeated practice under realistic exam conditions, run through timed question sets on our TN-CMCA practice test platform before committing to a scheduling date.
Test-Day Mechanics: Remote vs. Test Center
Prov offers two delivery options: a physical test center or remote proctoring through Examroom. Each has trade-offs worth planning around, especially given that this is an open-book exam with multiple physical reference volumes.
- Test center: You'll typically bring your own tabbed physical references (confirm allowed materials with the current bulletin). Environment is controlled and distraction-free.
- Remote Examroom delivery: Requires a compliant workspace, webcam setup, and often digital or approved physical references visible to the proctor. Test your setup well ahead of your appointment window.
Whichever format you choose, treat your reference materials like test-day equipment: tabbed, organized, and rehearsed under time pressure at least once before the real attempt. For scheduling windows, deadlines, and how appointment slots open up under the Prov system, see TN-CMCA Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
After You Pass: License, Business and Law, and Renewal
Passing the 100-question trade exam is a major milestone, but it's one piece of the licensing puzzle. Your exam score is typically valid for two years, giving you a window to complete the remaining requirements - including the Tennessee Business and Law exam, financial capacity documentation, references, and insurance proof - before submitting your full application.
The initial contractor application fee is $250, and once licensed, renewal occurs every two years for $200. Add these figures to the $50 Board preapproval fee and the $53 Prov exam fee, and you have the full cost picture of becoming a licensed CMC-A contractor in Tennessee. A complete cost breakdown, including how these fees stack up over a multi-year licensing cycle, is available at TN-CMCA Certification Cost 2026: Complete Pricing Breakdown.
Once licensed, many CMC-A holders find their credential opens doors with residential and commercial plumbing contractors, mechanical firms, and design-build outfits across Tennessee. If you're weighing whether the investment of time and fees pays off, read Is the TN-CMCA Certification Worth It? Complete ROI Analysis 2026 and TN-CMCA Salary Guide 2026: Complete Earnings Analysis for a fuller picture, and check TN-CMCA Jobs for where licensed contractors are typically in demand.
FAQ
The exam has 100 multiple-choice questions with a 5-hour time limit, and you need a 73% score to pass.
Yes. It's an open-book, computer-based exam, and you're permitted to use the listed references, including the 2021 International Plumbing Code and Plumbing Basics for Contractors, 4th Edition.
Yes. The Tennessee Board for Licensing Contractors requires preapproval, which has its own $50 fee, and requires proof of at least three years of plumbing experience or a relevant engineering degree.
Drain, Waste, and Vent Systems is the largest domain at 20%, followed by Isometrics at 18%. Together they make up nearly 40% of the exam.
Scores are typically valid for two years. You'll still need to pass Tennessee Business and Law and complete the full application, which carries a $250 initial fee, before licensure.
For the broader picture of what this credential is and how it fits into a Tennessee plumbing career, start with What Is TN-CMCA? or explore practice questions directly on our TN-CMCA exam prep home page to gauge where your study time is best spent.