- NV-C1 Requirements Overview
- Journeyman & Supervisory Experience Rules
- Education Substitution for Experience
- Financial, Bond, and Insurance Requirements
- Exam Format and What Gets Tested
- Application and Exam Fee Breakdown
- Approved References and Exam-Room Rules
- Mapping a Prep Timeline to the Blueprint
- After Passing: Licensing and Renewal
- FAQ
- Four years of qualifying journeyman, supervisory, or contractor experience within the last 15 years is the default requirement.
- Board-approved education can offset up to three of those four required years.
- The C-1 trade exam has 120 scored questions and a five-hour limit; you need 84 correct (70%) to pass.
- PSI charges $95 for one exam portion or $140 for both the trade exam and the CMS business-and-law exam.
NV-C1 Requirements Overview
The Nevada Plumbing and Heating Contractor (C-1) Trade Exam is administered through PSI Services LLC under authority of the Nevada State Contractors Board. This is the full C-1 classification covering plumbing and heating work - not the narrower C-1d plumbing-only exam - so the requirements and content scope are broader than candidates sometimes expect. Before you can even schedule a testing appointment, the Board must approve your application. That approval hinges on verified field experience, financial standing, and (where applicable) bond and insurance documentation.
If you're still deciding whether this credential matches your career goals, it's worth reading What Is NV-C1? and NV-C1 Meaning for context before diving into the eligibility mechanics below.
Journeyman & Supervisory Experience Rules
The Board's baseline standard for the trade qualifier is four full years of qualifying experience within the preceding 15 years. That experience must come from work performed as a journeyman, in a supervisory capacity, or as a contractor in plumbing and heating trades - not general labor or unrelated construction time.
Candidates often ask who actually hires people holding this license. In Nevada, C-1 license holders typically run or qualify plumbing and heating companies bidding on residential and commercial installation, service, and repair work - everything from water heater and boiler installs to gas piping and hydronic systems. Understanding the trade's real-world scope helps clarify why the Board requires supervised field time before you sit for the exam rather than allowing straight-to-test entry.
Education Substitution for Experience
Not every applicant has four years of pure field time, and the Board recognizes that. Board-approved education can substitute for up to three of the four required years. This means, in practice, a candidate with strong formal training in plumbing/heating trades plus at least one year of verifiable hands-on experience may still qualify.
Key Takeaway
Education substitution has a hard ceiling - you cannot waive the entire four-year requirement through coursework alone. At least one year of documented field experience is still expected.
Financial, Bond, and Insurance Requirements
Beyond the experience threshold, the Board evaluates financial responsibility as part of licensure. Applicants should expect to demonstrate adequate financial standing and, depending on the scope of work planned, maintain a contractor's bond and applicable insurance coverage. These aren't one-time checkboxes - bond and insurance compliance carries forward through every renewal cycle, which occurs every two years.
Because these financial requirements run parallel to the testing process, it's smart to start gathering documentation while you're still studying. For a full cost picture - application fees, exam fees, and licensing fees together - see NV-C1 Certification Cost 2026: Complete Pricing Breakdown.
Exam Format and What Gets Tested
Once the Board approves your application, you can schedule the computer-administered C-1 trade exam through PSI. The format is open-book, meaning you're permitted to bring specific approved references (covered below), but that doesn't make the content easy - you still need working knowledge of code sections, calculations, and system logic across 23 distinct domains.
- 120 scored questions, with a five-hour time limit
- Passing score: 84 correct answers, equal to 70%
- PSI may insert 1-10 unscored experimental questions, which count against your five-hour clock even though they aren't graded
Domain Weighting You Need to Know
The official blueprint (PSI bulletin updated March 25, 2026) allocates specific item counts across all 23 domains. Four domains tie for the largest individual share at eight items each - Gas Systems, Water Supply, Traps and Interceptors, and Isometric Analysis/Plumbing Mathematics - while Drain, Waste, and Vents stands alone as the single largest domain at 10 items.
Drain, Waste, and Vents (10 items)
The heaviest-weighted domain on the exam. Expect questions on venting configurations, trap arm distances, slope requirements, and cleanout placement logic.
- Master DWV sizing tables before anything else
- Practice reading isometric drawings that show waste and vent routing together
Gas Systems, Water Supply, Traps and Interceptors, Isometric Analysis/Plumbing Mathematics (8 items each)
Four domains share the second-highest weight. Together they cover roughly a quarter of the exam, so weak preparation in any one of them meaningfully raises your risk of missing the 84-correct threshold.
- Gas Systems draws heavily on NFPA 54 sizing and shutoff requirements
- Plumbing Mathematics questions often require pipe-sizing or slope calculations under time pressure
For the complete breakdown of all 23 domains - including the smaller-weighted areas like Solar, Breathing Systems for Firefighters, and Chilled Water Piping - see NV-C1 Exam Domains 2026: Complete Guide to All 23 Content Areas.
| Domain | Scored Items | Share of 120 |
|---|---|---|
| Drain, Waste, and Vents | 10 | Largest single domain |
| Gas Systems | 8 | Tied for second-largest |
| Water Supply | 8 | Tied for second-largest |
| Traps and Interceptors | 8 | Tied for second-largest |
| Isometric Analysis/Plumbing Mathematics | 8 | Tied for second-largest |
| Boilers | 4 | Mid-weight |
| Cleanouts | 4 | Mid-weight |
Application and Exam Fee Breakdown
Understanding fee mechanics prevents scheduling surprises. The Board charges a $300 application fee, separate from PSI's testing fees. Once approved, PSI charges $95 for one exam portion (the trade exam alone) or $140 if you pair the trade exam with the CMS business-and-law exam in the same sitting.
After passing, licensing itself carries additional cost: the initial two-year license runs $600, and biennial renewal is also $600 each cycle. These figures are separate from any bond premiums or insurance costs you carry independently.
If you want the exact math on total out-of-pocket cost including retake scenarios, see NV-C1 Certification Cost 2026: Complete Pricing Breakdown.
Approved References and Exam-Room Rules
Because this is an open-book exam, knowing exactly what you can and cannot bring into the testing room is part of meeting the requirements. Five references are permitted:
- UPC 2018 (Uniform Plumbing Code)
- UMC 2018 (Uniform Mechanical Code)
- NFPA 54 (2012) - National Fuel Gas Code
- NFPA 58 (2014) - Liquefied Petroleum Gas Code
- NFPA 13 (2019) - Standard for the Installation of Sprinkler Systems
The bulletin also lists study references used to build the exam that you cannot bring with you - don't confuse a study resource with an admitted reference. Only the five books above are allowed in the room.
Key Takeaway
You may advance-highlight, underline, and add permanent tabs to your five approved books before the exam. Handwritten notes, loose papers, and temporary tabs are prohibited and can get materials confiscated.
A silent, nonprinting, nonprogrammable calculator without an alphabetic keyboard is also allowed - useful given how math-heavy the Isometric Analysis/Plumbing Mathematics domain gets.
Mapping a Prep Timeline to the Blueprint
Rather than studying domains in the order they're listed, sequence your prep by item weight. Spend the earliest, highest-focus weeks on Drain, Waste, and Vents (10 items) and the four eight-item domains, since together they represent over a third of your scored questions.
Drain, Waste, and Vents + Gas Systems
- Build fluency with UPC venting tables and NFPA 54 gas sizing charts
- Practice tabbing your reference books the way you'll use them on exam day
Water Supply, Traps and Interceptors, Isometric Analysis/Plumbing Mathematics
- Drill pipe-sizing and slope calculations using your approved calculator
- Work through isometric drawing problems under timed conditions
Mid-weight and lower-weight domains
- Cover Boilers, Hydronics, Water Heaters/Venting, Backflow, and remaining domains
- Run full-length timed practice sessions against the five-hour limit
For a deeper study framework built specifically around this blueprint, see NV-C1 Study Guide 2026: How to Pass on Your First Attempt, and gauge realistic difficulty expectations in How Hard Is the NV-C1 Exam? Complete Difficulty Guide 2026. Running full-length timed simulations on our NV-C1 practice test platform before exam day helps confirm you can sustain accuracy across all 120 questions within the five-hour window.
After Passing: Licensing and Renewal
Passing the trade exam and, if paired, the CMS is only part of the finish line. The Board still requires the $300 application fee (if not already paid), verification of financial and bond/insurance standing, and the $600 initial license payment before your two-year license is issued. From there, renewal happens every two years at $600 per cycle, with continued bond and insurance compliance expected throughout.
Curious what the license actually opens up in terms of work opportunities? Browse NV-C1 Jobs for a sense of the roles this credential supports, and check Is the NV-C1 Certification Worth It? Complete ROI Analysis 2026 if you're weighing the long-term value against the requirements outlined here.
FAQ
The Board generally requires four full years of qualifying journeyman, supervisory, or contractor experience within the preceding 15 years, though Board-approved education can substitute for up to three of those years.
Yes. PSI charges $95 for a single exam portion, such as the C-1 trade exam alone, or $140 if you schedule the trade exam together with the CMS business-and-law exam.
You must wait two weeks before scheduling a retake. If you fail three times total, your application is voided and you must reapply to the Board from the beginning.
Only five: UPC 2018, UMC 2018, NFPA 54 (2012), NFPA 58 (2014), and NFPA 13 (2019). You can pre-highlight and permanently tab these, but handwritten notes and loose papers are not allowed.
No. The C-1 is the full Plumbing and Heating Contractor trade examination, while C-1d covers plumbing only. This article and the required domain weighting apply to the full C-1 exam.