- The trade exam has 80 scored questions in three hours; you need 56 correct (70%) to pass.
- Estimating, Plan Reading and General Code Requirements is the largest domain at 18 questions - prioritize it.
- Trade exam retakes cost $120 each; the full path (application + trade + law/business) totals $290 before books and insurance.
- Only permanent tabs, highlighting, and underlining are allowed on references - loose notes and temporary tabs are prohibited.
What the MS-RB Exam Actually Tests
The Mississippi Residential Builder License Exam (MS-RB) is the trade examination administered by PSI Services LLC on behalf of the Mississippi State Board of Contractors (MSBOC) for candidates applying under the Residential Building classification. This classification covers new construction, construction management, remodeling, and roofing on one- and two-family residential structures not exceeding three stories. If you're still getting oriented, our companion piece What Is MS-RB? and the deeper dive in MS-RB Meaning lay out the basics before you get into exam mechanics here.
Passing the trade exam is only part of the licensing path. MSBOC also requires a separate Law and Business Management examination, and the license itself is issued only after your application, insurance, and reference documentation clear review. This guide focuses on the trade exam content and mechanics; for the full eligibility picture, see MS-RB Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Registration, Fees, and Eligibility Windows
Before you can schedule a seat with PSI, MSBOC has to approve your application and confirm your eligibility. The order matters: apply to MSBOC first, wait for PSI eligibility confirmation, then schedule. Skipping ahead isn't possible because PSI won't have a record of you yet.
- Residential application fee: $50 for one classification.
- Trade exam fee: $120 per attempt - this applies to retakes too, so a failed attempt isn't a discounted redo.
- Law and Business Management exam fee: combined with the trade exam, the two portions total $240.
- All-in total: application plus both exam portions comes to $290, before books, prep materials, insurance, or other setup costs.
A full cost breakdown, including what happens if you need multiple attempts, is available in MS-RB Certification Cost 2026: Complete Pricing Breakdown. Once MSBOC confirms your eligibility, that eligibility window lasts six months, and you can retake the exam as many times as needed within it - each attempt billed separately at the standard fee. If six months pass without a pass, you'll need to reapply. For a calendar-style view of testing windows and how the six-month clock interacts with scheduling, check MS-RB Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Key Takeaway
Budget for the possibility of a retake. At $120 per attempt, a single miss on the trade exam is a real cost - spending extra time on the Estimating, Plan Reading and General Code Requirements domain before your first sitting is cheaper than a second $120 attempt.
Exam Format: 80 Questions, Open Book, Three Hours
The MS-RB trade exam is computer-delivered and open-book, with 80 scored questions to complete in three hours. The passing score is 70%, which works out to 56 correct answers. That math is worth internalizing early - you have room to miss 24 questions and still pass, but you don't have room to guess blindly through an entire domain.
One detail that trips up candidates who studied from older prep material: PSI's April 23, 2026 bulletin permits one to ten additional unscored experimental questions mixed into your exam. These don't count toward your score, but they do count against your three-hour clock, since there's no way to tell scored questions from experimental ones during the test. Plan your pacing assuming the exam could run slightly longer than 80 pure scored items.
For a precise breakdown of how the 70%/56-correct threshold interacts with question difficulty and pacing, see MS-RB Passing Score 2026: Exactly What You Need to Pass. If you're trying to gauge overall difficulty before committing to a test date, How Hard Is the MS-RB Exam? Complete Difficulty Guide 2026 and MS-RB Pass Rate 2026: What the Data Shows are both useful reads.
Approved References and Tabbing Rules
Because this is an open-book exam, knowing exactly what you're allowed to bring - and how you're allowed to mark it up - is as important as knowing the content. MSBOC recognizes eight approved reference categories:
- The 2021 International Residential Code
- OSHA 29 CFR 1926
- Concrete references
- Masonry references
- Carpentry references
- BCSI truss bracing references
- Pipe/excavation references
- Roofing references
Use the specific code edition listed - the 2021 IRC. Bringing an older or newer edition, or a non-code reference that isn't on the approved list, is done entirely at your own risk; PSI and MSBOC won't accommodate confusion caused by a mismatched edition.
Build your reference set weeks in advance, not the night before. Permanent tabbing takes time to do well, and you want your IRC, OSHA reference, and trade-specific manuals tabbed by topic before you ever sit down at the PSI test center.
Domain-by-Domain Breakdown
PSI allocates the 80 scored questions across nine domains. The weighting isn't even, and knowing where the heaviest concentrations sit should directly shape how you divide study time. A full walkthrough of each domain's content boundaries lives in MS-RB Exam Domains 2026: Complete Guide to All 9 Content Areas, but here's the practical summary.
Domain 7: Estimating, Plan Reading and General Code Requirements - 18 questions
This is the single largest domain on the exam, and it's also the most likely to combine skills from other domains. Expect questions that require reading a plan detail and cross-referencing it against IRC code requirements.
- Practice reading residential plan sets, not just isolated code sections
- Know how to locate specific IRC provisions quickly under time pressure
- Be comfortable with basic quantity and material estimating problems
Domain 4: Carpentry - 15 questions
The second-largest domain. Covers framing, fastening, and structural carpentry practices specific to one- and two-family residential construction.
- Review your approved carpentry reference for framing tolerances and connection details
- Pay attention to how carpentry topics intersect with BCSI truss bracing references
Domain 1: Site work, Footings and Foundations - 13 questions
The third-largest allocation. Site prep, excavation, footing dimensions, and foundation systems fall here.
- Cross-check footing and foundation questions against both the IRC and pipe/excavation references
- Understand how soil and site conditions affect foundation requirements under the code
The remaining six domains - Concrete and Concrete Reinforcement, Masonry, Associated Trades and Drywall, Roofing, OSHA Safety, and Licensing - carry smaller question counts individually but still require solid command of their respective approved references. Don't assume a smaller domain is safe to skip; missing several easy questions in a lightly-weighted domain adds up just as fast as missing a few in a heavier one.
A Domain-Weighted Study Timeline
A generic weekly study calendar isn't useful on its own - what matters is mapping your available weeks to the MS-RB domain weights above. Here's one way to structure a six-week runway before your scheduled attempt, front-loading the heaviest domains while your energy and time are highest.
Estimating, Plan Reading and General Code Requirements
- Work through IRC-based plan reading exercises daily
- Tab your 2021 IRC copy by chapter and common topic
- Practice basic material and quantity estimating problems
Carpentry and Site work/Footings/Foundations
- Study framing and connection details against your carpentry reference
- Review footing depth and foundation code requirements
- Cross-reference BCSI truss bracing material for carpentry overlap questions
Concrete, Masonry, Roofing
- Work through concrete reinforcement and masonry reference sections
- Study roofing systems and materials against the approved roofing reference
Associated Trades/Drywall, OSHA Safety, Licensing
- Review OSHA 29 CFR 1926 fall protection, excavation, and scaffolding sections
- Study MSBOC licensing rules covered under the Licensing domain
Full Review and Reference Prep
- Finalize permanent tabs across all eight reference categories
- Run timed practice sessions simulating the three-hour, 80-question format
- Confirm test center logistics and required identification
If you want a condensed, one-page version of the highest-yield facts to review the night before your exam, bookmark MS-RB Cheat Sheet 2026: One-Page Review of Must-Know Facts. And if you're preparing through structured coursework rather than self-study, MS-RB Training covers what optional prep courses typically include - remember that MSBOC does not require a prep course, only the exam itself.
Test Day Logistics
Arrive with your tabbed, approved references organized by category - IRC, OSHA, concrete, masonry, carpentry, BCSI truss bracing, pipe/excavation, and roofing. Double-check that no loose papers, sticky notes, or temporary flags are tucked inside any reference book; PSI proctors check for this, and prohibited items can be removed before you're allowed to start.
Bring a silent, nonprinting, nonprogrammable calculator if you plan to use one for estimating or quantity questions. Pace yourself against the three-hour clock knowing that up to ten unscored experimental questions may be mixed in - don't let a strange or unfamiliar question derail your confidence on the questions that follow.
| Item | Detail |
|---|---|
| Scored questions | 80 |
| Possible unscored experimental questions | 1 to 10 (count against time) |
| Time allowed | 3 hours |
| Passing score | 70% (56 correct) |
| Format | Computer-delivered, open-book |
| Trade exam fee per attempt | $120 |
After You Pass: Law/Business Exam, License, Renewal
Passing the trade exam is not the finish line. MSBOC also requires the separate Law and Business Management examination, and it's important to note that a reciprocity-based waiver of the trade exam does not waive that requirement - you'll still need to sit for Law and Business Management regardless of how you qualified for the trade portion.
Beyond the exams, your application must include a qualifying owner, officer, or responsible managing employee; at least three completed-job examples; three reference letters (one bank reference plus two construction-related references); general-liability insurance; applicable business and tax registrations; and workers' compensation coverage if you employ five or more people. The full checklist is broken down in MS-RB Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Once licensed, renewal is annual at $100, or $110 if you renew late within the permitted grace period. Let your license lapse more than 180 days and you'll be filing a brand-new application rather than a renewal. Active residential qualifiers whose licenses were issued on or after July 1, 2015 must complete two approved continuing education hours annually; inactive status is exempt from that requirement.
Curious what the license actually opens up in terms of work and hiring? MS-RB Jobs and Is the MS-RB Certification Worth It? Complete ROI Analysis 2026 both cover the practical side of holding the credential, while MS-RB Salary Guide 2026: Complete Earnings Analysis looks at earnings considerations for licensed residential builders in Mississippi.
Key Takeaway
Treat the trade exam, the Law and Business Management exam, and the full MSBOC application as three separate hurdles with three separate requirements - passing one doesn't waive the others, even under reciprocity.
Before you schedule your exam, it's worth running through practice questions structured around these exact nine domains so you can see where your real gaps sit rather than guessing. You can start building that baseline over on the main practice test site, and use MS-RB Certification as a broader reference point if you want to confirm how the trade exam fits into the overall licensing process before diving into practice sessions on the practice platform.
Frequently Asked Questions
The trade exam has 80 scored questions, and you need a 70% score to pass, which equals 56 correct answers. You may also encounter up to 10 additional unscored experimental questions that count against your three-hour time limit but not your score.
No. Handwritten notes, loose or attached papers, and temporary tabs are prohibited. You may use pre-exam highlighting, underlining, and permanent tabs in your approved references, plus a silent, nonprinting, nonprogrammable calculator.
The residential application fee is $50, the trade exam is $120 per attempt, and the trade plus Law and Business Management exams together total $240. Combined, the application and both exam portions come to $290 before books, prep materials, and insurance.
Estimating, Plan Reading and General Code Requirements is the largest domain at 18 of 80 questions, followed by Carpentry at 15 and Site work, Footings and Foundations at 13. Together these three domains make up nearly half the exam.
No. A reciprocity-based waiver of the trade exam does not waive the separate Law and Business Management examination, which remains a required part of the MSBOC licensing process.