- NV-C15 is the Nevada State Contractors Board's C-15 Roofing and Siding Contractor trade exam, administered by PSI.
- The exam has 60 scored questions, a 120-minute limit, and requires 45 correct (75%) to pass.
- Steep Roofing is the heaviest domain at 16 of 60 questions - study it first.
- Fees run $95 for the trade portion alone or $140 for trade plus the Contractor Management Survey.
What Is NV-C15?
NV-C15 refers to the Nevada C-15 Roofing and Siding Contractor Trade Exam, the licensing examination overseen by the Nevada State Contractors Board and delivered through PSI's computer-based testing network. It is the full trade exam for roofing and siding contractors seeking licensure in Nevada - not the narrower C-15a Roofing-only exam that some candidates confuse it with. Anyone researching this credential should be careful about which C-15 they're reading about, because the acronym is reused elsewhere for unrelated programs.
Passing NV-C15 is the trade-competency piece of Nevada contractor licensing. It sits alongside separate business and financial requirements the Board evaluates independently. If you're just starting to map out what this process looks like end to end, the NV-C15 Requirements 2026: Eligibility, Prerequisites & How to Qualify guide walks through the full eligibility picture before you even schedule a test date.
Who Administers the Exam
The Nevada State Contractors Board sets licensing policy and approves applicants before they can schedule a test date. PSI is the testing vendor that builds, delivers, and scores the actual C-15 exam content. This two-party structure matters practically: Board approval is a prerequisite step, and only after that approval does a candidate move into PSI's scheduling system to sit for the trade exam and, if applicable, the separate Contractor Management Survey (CMS) portion.
PSI periodically updates its candidate bulletin - the version referenced for this article is dated March 25, 2026 - and that bulletin is the authoritative source for testing-day rules, allowed materials, and content weighting. If terminology in this article ever seems to differ from what you see elsewhere, defer to the current PSI bulletin and the Board's own licensing pages.
Exam Format and Scoring
NV-C15 is a computer-delivered, multiple-choice exam. Candidates get 120 minutes to answer 60 scored questions, and a passing result requires 45 correct answers - 75%. PSI also reserves the right to insert between 1 and 10 unscored experimental questions into the same test session, within the same time allowance. These experimental items are indistinguishable from scored questions, so there's no strategic value in trying to guess which ones don't count - just answer every question as if it matters, because most of them do.
If you want the exact numeric thresholds broken down further, including how the 75% cutoff interacts with the experimental-question allowance, see NV-C15 Passing Score 2026: Exactly What You Need to Pass. For a broader discussion of how tough the format actually feels in practice, How Hard Is the NV-C15 Exam? Complete Difficulty Guide 2026 covers pacing, question style, and common time-management mistakes.
Key Takeaway
With 120 minutes for 60 scored questions plus up to 10 unscored ones, you have roughly two minutes per question at most - treat every item as scored and keep moving.
The Nine Exam Domains
The C-15 blueprint is organized into nine content domains. Question distribution is not even across them - Steep Roofing carries the most weight at 16 of the 60 scored questions, making it the single largest content area on the exam.
Domain 1: Safety
Covers job-site hazard awareness, fall protection, and safe handling of roofing materials and equipment.
- Fall protection requirements on sloped and low-slope roofs
Domain 2: Roofing Substrates
Deck materials, sheathing, and the substrate conditions that determine which roofing system can be installed.
- Compatibility between substrate type and finished roofing system
Domain 3: Steep Roofing
The largest domain on the exam at 16 of 60 questions. Covers shingles, tile, and other sloped-roof systems including installation sequencing and code-driven details.
- Underlayment, flashing details, and manufacturer-spec installation steps
Domain 4: Roofing Repairs
Diagnosing failure points and applying correct repair methods without compromising surrounding roofing systems.
- Identifying leak sources versus cosmetic defects
Domain 5: Elastomeric Roofing
Liquid-applied and membrane elastomeric systems, their application conditions, and cure requirements.
- Substrate prep and coating thickness considerations
Domain 6: Built-up Bituminous Roofing
Multi-ply built-up roofing (BUR) systems, hot and cold application methods, and layering practices.
- Ply orientation and bitumen application temperatures
Domain 7: Sheet Metal and Flashing
Metal flashing fabrication and installation at roof penetrations, valleys, and terminations.
- Flashing at transitions where leaks most commonly originate
Domain 8: Siding
Exterior siding materials, attachment methods, and weatherproofing at siding-to-roof transitions.
- Material-specific fastening and clearance requirements
Domain 9: Photovoltaic Systems
Roof-mounted solar considerations, including how PV installations interact with roofing integrity and warranties.
- Penetration and flashing methods around mounting hardware
For a deeper walk-through of each domain with more granular subtopics, the NV-C15 Exam Domains 2026: Complete Guide to All 9 Content Areas article breaks every content area down further than this overview does.
| Exam Element | Detail |
|---|---|
| Scored questions | 60 |
| Time allowed | 120 minutes |
| Passing score | 45 correct (75%) |
| Unscored experimental items | 1-10 (within same time limit) |
| Largest domain | Steep Roofing - 16 of 60 questions |
| Question format | Multiple-choice, computer-delivered |
Open-Book References and Allowed Materials
NV-C15 is not fully closed-book, but the open-book allowance is narrow. Candidates may bring in only the listed 2018 International Building Code during the exam. Other commonly referenced materials - NRCA manuals, OSHA publications, and other resources listed in the bulletin - are considered study-only and cannot be brought into the testing room.
Before test day, candidates are permitted to highlight, underline, and add permanent tabs to their allowed 2018 IBC reference. What's not allowed is adding handwritten notes either before or during the exam, or inserting extra loose papers into the reference book. A silent, nonprinting, nonprogrammable calculator is also permitted for any calculation-based questions.
Fees, Scheduling, and Retakes
Testing costs for NV-C15 are straightforward: $95 covers a single examination portion, while $140 covers both the trade exam and the separate Contractor Management Survey (CMS) portion together. Retakes follow this same fee schedule - there's no discounted rate for repeat attempts.
Scheduling isn't something a candidate can do independently at will. Board approval must happen first, and only after that approval can a test date be scheduled through PSI. Once an application is submitted, required examinations must be completed within six months. If a candidate fails, Nevada requires a two-week wait before a retake can be scheduled, and three failures will void the application entirely - at that point a new application process would be required.
For candidates weighing the full financial picture - application fees, licensing costs, and exam fees together - NV-C15 Certification Cost 2026: Complete Pricing Breakdown lays out every line item. And if your main concern right now is simply when and how to get on the calendar, NV-C15 Exam Dates 2026: Testing Windows, Deadlines & Scheduling covers the scheduling mechanics in more depth.
Key Takeaway
Three failed attempts voids the application - treat every retake seriously and use the mandatory two-week wait to target your weakest domain, not just repeat generic review.
Who Needs to Take It
NV-C15 is aimed at people pursuing a Nevada roofing and siding contractor license - typically journey-level roofers, foremen, supervisors, or existing contractors moving into a licensed classification. The trade qualifier taking the exam generally needs four years of relevant experience at the journey-level, foreman, supervisory, or contractor level within the preceding fifteen years. Approved education can substitute for up to three of those four years, but experience still has to be verified.
Beyond the exam itself, licensing requires several separate pieces: experience verification (a resume or accepted alternative evidence), financial documentation, and applicable bonding. The application fee is $300, and initial licensing plus biennial renewal runs $600, with any applicable Residential Recovery Fund charges billed separately from that. None of these financial and documentation requirements are graded on the exam itself, but they gate whether you're allowed to schedule one.
Employers in Nevada's roofing and siding trade generally look for candidates who either hold this license already or are actively working toward it, since it's the credential that legally permits contracting in this classification. If you're evaluating how this fits into a career path, NV-C15 Jobs covers where licensed contractors typically find work, and NV-C15 Salary Guide 2026: Complete Earnings Analysis looks at earning considerations tied to holding the license.
Building a Study Plan Around the Blueprint
Because Steep Roofing alone accounts for 16 of 60 questions - well over a quarter of the entire scored exam - it deserves the earliest and heaviest study block. After that, Sheet Metal and Flashing, Roofing Repairs, and Roofing Substrates tend to overlap conceptually with Steep Roofing content, which makes them efficient to study in sequence rather than jumping around.
Steep Roofing + Safety
- Work through Steep Roofing installation sequencing and code references first, since it's the highest-weighted domain
- Layer in Safety fundamentals, which recur across practical scenario questions
Substrates, Repairs, and Flashing
- Study Roofing Substrates and Roofing Repairs together - failure diagnosis depends on substrate knowledge
- Move into Sheet Metal and Flashing, since penetration details connect back to Steep Roofing
Elastomeric, BUR, Siding, and PV
- Cover the smaller-weighted domains: Elastomeric Roofing, Built-up Bituminous Roofing, Siding, and Photovoltaic Systems
- Practice under the 120-minute time limit to build pacing habits
This sequencing isn't a generic study framework - it's built directly around where NV-C15 concentrates its points. For a more detailed week-by-week plan with specific reference-material tie-ins, see the NV-C15 Study Guide 2026: How to Pass on Your First Attempt. And once you're closer to test day, the NV-C15 Cheat Sheet 2026: One-Page Review of Must-Know Facts is useful for a final pass through must-know figures like the passing score and time limit.
Running timed practice sessions on our practice test platform before scheduling the real exam is one of the most direct ways to get comfortable with the multiple-choice format and the 120-minute pacing you'll face on test day. Repeated exposure to domain-weighted questions on the practice site also helps confirm which of the nine domains still need attention before you commit to a test date.
If you're still deciding whether pursuing this license is worth the time and cost investment given your career goals, Is the NV-C15 Certification Worth It? Complete ROI Analysis 2026 walks through that decision in more depth, and NV-C15 Pass Rate 2026: What the Data Shows looks at what's publicly known about how candidates perform. For structured training options ahead of the exam, NV-C15 Training outlines preparation resources beyond self-study.
Frequently Asked Questions
No. NV-C15 refers to the full C-15 Roofing and Siding Contractor trade examination administered by PSI for the Nevada State Contractors Board, which is broader than the narrower C-15a Roofing-only exam.
There are 60 scored questions with a 120-minute time limit. PSI may also add 1 to 10 unscored experimental questions within that same time allowance.
You need 45 correct answers out of 60 scored questions, which is 75%.
Only the listed 2018 International Building Code is allowed open-book. NRCA manuals, OSHA publications, and other listed references are for study purposes only and cannot be brought into testing.
You must wait two weeks before retaking, and retakes follow the same $95 or $140 fee schedule. Three failed attempts will void the application entirely.