- Passing requires 56 of 80 correct answers (70%) within a 180-minute window.
- Concrete, Metals, and General Code/Plan Reading/Estimating are tied as the largest domains on the outline.
- The exam is closed book except for code references PSI's current content outline expressly permits.
- Retesting means paying $95 again (or $140 if bundling with the CMS), so first-attempt prep matters financially.
The Pass Rate Reality: What's Actually Published
Anyone searching for a specific published pass-rate percentage for the Nevada General Building Contractor (Class B) Trade Exam will run into the same wall: PSI, which administers the exam on behalf of the Nevada State Contractors Board, does not release a public pass-rate figure for this specific trade exam. There is no official annual report breaking down first-attempt versus retake success for Class B candidates. Anyone quoting a precise percentage for this exam is either guessing or borrowing a number from an unrelated credential - a mistake worth watching for, since "NV-B" is used as shorthand by several different certifications in other industries.
What you can analyze instead is the structure of the exam itself, because structure is what actually determines difficulty. This article works from the verified mechanics - question count, time limit, passing threshold, domain weighting, and licensing requirements - to explain what the available data actually shows about how the exam behaves, rather than inventing a statistic that doesn't exist. For a broader look at overall difficulty, see How Hard Is the NV-B Exam? Complete Difficulty Guide 2026.
Exam Mechanics That Drive Outcomes
The Class B trade exam consists of 80 multiple-choice questions, administered in a 180-minute session, with a passing score of 56 correct answers - exactly 70%. That means candidates have roughly 2.25 minutes per question on average, though real pacing is uneven: estimating and plan-reading items typically take longer than straightforward code-recall questions.
The exam is closed book, with one important exception: code references are permitted only when PSI's current content outline expressly authorizes them for a given section. This distinction matters because candidates sometimes assume they can bring reference material broadly and are caught off guard by the restriction. Knowing exactly what's allowed - and confirming it against the current outline before test day - is covered in more depth in NV-B Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Because the exam allows limited, outline-specific code references rather than an open-book format, memorization of code logic still matters - you can't simply look up every answer.
Where the Questions Concentrate
The Class B exam draws from 11 content areas. According to the Board's outline, three domains are tied as the largest: Concrete, Metals, and General Code, Plan Reading, and Estimating. That tie is a meaningful data point in itself - it tells you the exam isn't dominated by a single specialty trade but instead spreads its heaviest weight across structural materials knowledge and the ability to read, calculate, and code-check a project.
Concrete
Covers formwork, reinforcement, curing, and placement standards relevant to general building work.
- Expect scenario questions tied to slab and foundation specifications
Metals
Covers structural steel, fasteners, and metal framing as used in general building construction.
- Questions often connect metal components to load-bearing context
General Code, Plan Reading, and Estimating
Covers interpreting plans, applying code requirements, and calculating quantities/costs.
- This domain rewards practice with real plan sets, not just flashcards
The remaining eight domains - Site Work, Masonry, Carpentry, Thermal and Moisture Protection, Doors and Windows, Drywall and Finishes, Safety, and Nevada One Call - still appear on the exam and cannot be skipped in preparation, but they carry comparatively less concentrated weight than the three tied leaders. A full breakdown of all 11 areas, including how they interrelate on a general building project, is available in NV-B Exam Domains 2026: Complete Guide to All 11 Content Areas.
| Domain Group | Relative Weight | Practical Focus |
|---|---|---|
| Concrete | Tied largest | Formwork, reinforcement, curing |
| Metals | Tied largest | Structural steel, framing, fasteners |
| General Code, Plan Reading, Estimating | Tied largest | Plan interpretation, code application, quantity takeoffs |
| Site Work, Masonry, Carpentry, Thermal/Moisture, Doors/Windows, Drywall/Finishes, Safety, Nevada One Call | Standard weighting | Trade-specific building practices and safety/notification rules |
Who Actually Sits for This Exam
The Class B trade exam is taken by the qualifying individual for a company seeking a general building contractor license in Nevada - someone the Board recognizes as having at least four years of relevant experience earned within the prior 15 years, with approved education able to substitute for up to three of those years. Class B covers buildings requiring more than two unrelated building trades, which is why the exam's domain spread mirrors an entire general building project rather than a single specialty. Firms doing plumbing-only or electrical-only work generally need separate classifications rather than Class B.
Passing the trade exam is only one piece of licensure. Candidates also need Board approval and must pass the Contractors Management Survey (CMS); a qualifying score on the NASCLA Accredited Examination for Commercial General Building Contractors can replace the trade exam itself, but it does not replace the CMS requirement. The full eligibility picture, including experience documentation, is laid out in NV-B Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Where Candidates Lose Points
Without an official breakdown of missed questions by domain, the most reliable way to identify likely weak spots is to look at where the exam concentrates its questions and where candidates' field experience is typically narrowest. Someone who has spent years framing and finishing but rarely touched estimating paperwork is statistically more exposed on the General Code, Plan Reading, and Estimating domain - one of the three tied-largest sections. Similarly, a superintendent who oversees subcontractors but hasn't personally poured concrete in years may need deliberate review of Concrete domain specifics rather than relying on field memory.
- Plan-reading fatigue: estimating and takeoff questions require sustained focus late in a 180-minute session.
- Code citation precision: because reference use is restricted to what the outline permits, guessing at code sections instead of knowing them directly is risky.
- Nevada One Call specifics: a smaller domain, but one candidates often under-review because it feels administrative rather than technical.
- Safety domain assumptions: field habits don't always match the specific standards tested.
A more detailed diagnostic of common mistakes and how to correct them before test day is covered in NV-B Study Guide 2026: How to Pass on Your First Attempt.
A Domain-Ordered Prep Timeline
Rather than a generic weekly template, the most efficient schedule for this exam allocates extra time to the three tied-largest domains while still touching all 11 areas at least once before test day. Practicing with a realistic 80-question, 180-minute simulation on the main practice test platform near the end of your prep helps confirm pacing before the real exam.
Concrete + Metals
- Review formwork, reinforcement, curing, structural steel, and framing standards
- Work practice questions specific to these two tied-largest domains
General Code, Plan Reading, and Estimating
- Practice reading real plan sets and performing quantity takeoffs
- Cross-reference code sections the outline permits you to use during the exam
Remaining Trade Domains
- Cover Site Work, Masonry, Carpentry, Thermal and Moisture Protection, Doors and Windows, Drywall and Finishes
- Focus on how each trade interacts with the others on a Class B project
Safety, Nevada One Call, and Full Simulation
- Review safety standards and Nevada One Call notification rules
- Take a full-length timed practice exam via a Nevada-specific practice test to check pacing against the 180-minute limit
The Real Cost of Not Passing the First Time
Because there's no public pass-rate percentage to reference, the more useful lens is financial: PSI charges $95 for the trade exam alone, or $140 if you schedule the trade exam and CMS together. A failed attempt means paying again, plus rescheduling delays that can push back your ability to secure Board approval and the $300 application fee toward your biennial $600 license. Treating first-attempt preparation as a cost-avoidance strategy, not just a knowledge goal, changes how seriously most candidates approach the tied-largest domains. A full breakdown of every fee involved - exam, CMS, application, and biennial licensing - is in NV-B Certification Cost 2026: Complete Pricing Breakdown, and the broader value question is addressed in Is the NV-B Certification Worth It? Complete ROI Analysis 2026.
Key Takeaway
Every retake costs $95 (or $140 bundled with the CMS) and adds scheduling delay - reason enough to prioritize the three tied-largest domains in your first pass through study material.
Frequently Asked Questions
No. Neither PSI nor the Board publishes a specific pass-rate percentage for this exam. Any number cited online without a direct source should be treated as unverified.
You need 56 correct answers out of 80 questions, which is 70%. Full detail is available in NV-B Passing Score 2026: Exactly What You Need to Pass.
Concrete, Metals, and General Code, Plan Reading, and Estimating are tied as the largest domains on the outline, making them the highest-value areas to review first.
The exam is closed book except for code references PSI's current content outline expressly authorizes. You cannot assume broad open-book access.
A qualifying NASCLA Accredited Examination for Commercial General Building Contractors score can replace the Class B trade exam, but it does not replace the CMS requirement for licensure.