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HI-GBC Exam Domains 2026: Complete Guide to All 8 Content Areas

TL;DR
  • The B trade exam has 80 scored questions across 8 domains, plus up to 10 unscored items that don't count against your time.
  • Concrete and Associated Trades tie as the largest content areas on the blueprint.
  • You need 75% correct (60 of 80) to pass, in 240 minutes, closed-book.
  • Concrete questions are limited to C-31a scope; Roofing questions are limited to C-42a/C-42b scope.

Exam Blueprint Overview

The Hawaii General Building Contractor (B) Trade Exam - referred to on this site as HI-GBC - is administered by PSI on behalf of the Hawaii Contractors License Board (Department of Commerce and Consumer Affairs, Professional and Vocational Licensing Division). The current PSI bulletin governing the trade exam is dated January 20, 2026, and it organizes everything a candidate needs to know into a single content outline made of eight domains.

Each domain represents a slice of the 80 scored questions you'll face. PSI may also insert up to ten additional unscored, experimental questions that look identical to scored items but do not count toward your result - and importantly, PSI states that time spent on those items does not count against your exam time. You won't know which questions are experimental, so every question deserves your full attention regardless.

Quick Framing: Think of the blueprint not as eight equal slices, but as a weighted map. Two domains - Concrete and Associated Trades - tie for the largest share of the exam, which should shape how you allocate study hours.

The 8 HI-GBC Content Areas Explained

Below is a breakdown of each domain as it appears on the current outline. If you want a companion resource that turns this into a study plan, pair this guide with the HI-GBC Study Guide 2026: How to Pass on Your First Attempt.

Domain 1: Plan Reading and Estimating

Covers interpreting construction drawings, specifications, and quantity takeoffs as they apply to general building work in Hawaii.

  • Reading architectural and structural plan symbols
  • Calculating material quantities and basic estimates
  • Cross-referencing specs against drawn details

Domain 2: Sitework and Foundations

Focuses on site preparation, excavation, grading, and the foundation systems that support a building.

  • Soil and site preparation basics
  • Footing and foundation types
  • Drainage and grading considerations

Domain 3: Concrete

One of the two largest domains on the outline. The outline specifically restricts this topic to C-31a scope of work, so questions stay within cement/concrete contracting boundaries rather than general concrete trivia.

  • Formwork, placement, and curing practices
  • Reinforcement basics within C-31a scope
  • Flatwork and structural concrete distinctions

Domain 4: Carpentry

Covers rough and finish carpentry as it relates to general building construction.

  • Framing methods and connections
  • Structural wood member selection
  • Finish carpentry standards

Domain 5: Associated Trades (including interior and exterior finishes, and windows & doors)

The second of the two largest domains, tying with Concrete. This is a broad category folding together several finish-related trade areas.

  • Interior finish systems and materials
  • Exterior finish applications
  • Window and door installation practices

Domain 6: Roofing

The outline restricts this domain to C-42a/C-42b scope of work, keeping roofing questions tied to that licensed trade boundary.

  • Roofing systems and materials within C-42a/C-42b scope
  • Installation sequencing
  • Common roofing failure points

Domain 7: Safety OSHA

Tests general jobsite safety knowledge and OSHA-related requirements applicable to building construction.

  • Fall protection and jobsite hazard awareness
  • Equipment and material handling safety
  • General OSHA compliance concepts

Domain 8: Thermal and Moisture Protection

Covers building envelope elements that keep structures protected from water and temperature-related damage.

  • Insulation and vapor barrier concepts
  • Waterproofing and flashing details
  • Moisture management at building assemblies

Why Concrete and Associated Trades Dominate the Blueprint

Because Concrete and Associated Trades tie for the largest share of scored questions, candidates who under-prepare either domain put a disproportionate amount of their 80 scored questions at risk. Note the deliberate scope limits built into the outline: the Concrete domain is restricted to C-31a work, and the Roofing domain is restricted to C-42a/C-42b work. That means the exam isn't asking you to know every concrete or roofing technique in existence - it's asking you to know the material within those specific licensed-trade boundaries.

Key Takeaway

Don't study concrete or roofing as generic construction trivia. Study them specifically within C-31a and C-42a/C-42b scope, since that's what the outline actually tests.

Associated Trades is a compound domain - it wraps interior finishes, exterior finishes, and windows & doors into one category. Because it's broad, it's easy to underestimate how many question topics it can generate. Treat it as three sub-areas you study separately, then integrate.

Question Format, Timing, and Closed-Book Rules

The B trade exam is delivered as computer-based multiple-choice testing, available either at a physical test center or through remote proctoring. Regardless of format, the rules are the same:

  • 80 scored questions, with up to 10 additional unscored experimental questions mixed in
  • 240 minutes total allotted time
  • 75% required to pass - equivalent to 60 correct answers out of 80
  • Closed book - the 2018 IBC and other listed trade references are for study purposes only and are not permitted in the exam room
  • A calculator is provided on-screen, or you may bring an eligible silent, nonprinting, nonprogrammable calculator
Closed-Book Reality Check: Because you cannot reference the 2018 IBC or other trade texts during testing, memorization and applied recall matter more than familiarity with where to look something up. Build recall specifically around the eight domains above rather than general code browsing.

For a deeper breakdown of exactly how the 75% threshold works and what it means score-wise, see HI-GBC Passing Score 2026: Exactly What You Need to Pass. If you're still weighing how demanding this exam is relative to your background, How Hard Is the HI-GBC Exam? Complete Difficulty Guide 2026 covers that in detail, and HI-GBC Pass Rate 2026: What the Data Shows looks at outcome data.

Registration, Fees, and Deadlines That Affect Your Prep

Domain mastery doesn't happen in isolation from the administrative side of licensing - the timeline you're working against shapes how you should pace domain study. Key mechanics to know:

  • The trade exam fee is $85; the separately required Business and Law examination is $80 for new applicants, totaling $165 in examination charges.
  • Sole-proprietor and responsible-managing-employee application fees are $50, separate from exam and license charges.
  • You must obtain Board approval before registration and pass all required exams within six months of approval.
  • Applicants must be at least 18 years old and generally document four years of supervisory experience within the preceding ten years, supported by at least three notarized experience certificates and a chronological project list.
  • Qualifying technical training may earn up to one year of experience credit.

The Business and Law outline changed separately, on March 30, 2026, so if you're studying both exams together, make sure your materials reflect the correct effective dates for each. Licenses renew on September 30 of even-numbered years; for 2026, the active entity/sole-proprietor renewal is $338 and the active responsible-managing-employee renewal is $208, alongside applicable insurance and tax-clearance requirements.

Because your six-month window starts at Board approval, domain study should begin before you formally register, not after. For a full cost breakdown across every fee category, read HI-GBC Certification Cost 2026: Complete Pricing Breakdown, and for eligibility specifics see HI-GBC Requirements 2026: Eligibility, Prerequisites & How to Qualify. Scheduling logistics and deadlines are covered in HI-GBC Exam Dates 2026: Testing Windows, Deadlines & Scheduling.

Mapping a Study Schedule to the Domains

Rather than splitting study time evenly across eight domains, allocate time proportional to weight and complexity. Given that Concrete and Associated Trades tie for the largest share, and that Plan Reading and Estimating underpins comprehension of the others, a logical sequence looks like this:

Week 1

Foundational Reading Skills

  • Domain 1: Plan Reading and Estimating - build the interpretation skills you'll rely on for every other domain
  • Domain 2: Sitework and Foundations
Week 2

Heaviest-Weighted Domain

  • Domain 3: Concrete, focused strictly on C-31a scope
  • Practice quantity and material recall for concrete-related questions
Week 3

Framing and Finishes

  • Domain 4: Carpentry
  • Domain 5: Associated Trades - treat interior finishes, exterior finishes, and windows & doors as three mini-topics
Week 4

Envelope, Safety, and Review

  • Domain 6: Roofing, focused on C-42a/C-42b scope
  • Domain 7: Safety OSHA
  • Domain 8: Thermal and Moisture Protection
  • Full closed-book practice run under 240-minute timing

If you want a compact reference to review in the final days before your test date, keep the HI-GBC Cheat Sheet 2026: One-Page Review of Must-Know Facts nearby, and run practice questions from our practice test platform throughout each week rather than saving all review for the end.

Who Actually Uses This Credential

The B General Building Contractor license and its underlying trade exam are the credential Hawaii-based general contractors need to legally bid and manage building projects spanning multiple trades - from foundation and framing through finishes and roofing coordination. Employers and clients looking for licensed general contractors typically expect familiarity across all eight domains, since the license authorizes broad building work rather than a single specialty.

If you're still exploring what this designation actually authorizes and how it differs from specialty trade licenses, start with What Is HI-GBC? or HI-GBC Meaning. For career and earnings context tied to holding this license, see HI-GBC Salary Guide 2026: Complete Earnings Analysis and HI-GBC Jobs. If you're weighing whether pursuing licensure is worth the time and fees, Is the HI-GBC Certification Worth It? Complete ROI Analysis 2026 walks through that decision.

DomainCore FocusNotable Scope Limit
Plan Reading and EstimatingDrawings, specs, takeoffsNone specified
Sitework and FoundationsExcavation, grading, footingsNone specified
ConcreteFormwork, placement, curingRestricted to C-31a work
CarpentryFraming and finish carpentryNone specified
Associated TradesInterior/exterior finishes, windows & doorsCombines three sub-areas
RoofingRoofing systems and installationRestricted to C-42a/C-42b work
Safety OSHAJobsite safety and OSHA basicsNone specified
Thermal and Moisture ProtectionInsulation, waterproofing, flashingNone specified

Frequently Asked Questions

How many domains are on the HI-GBC B trade exam?

There are eight: Plan Reading and Estimating, Sitework and Foundations, Concrete, Carpentry, Associated Trades, Roofing, Safety OSHA, and Thermal and Moisture Protection.

Which domains carry the most questions?

Concrete and Associated Trades tie for the largest share of the 80 scored questions on the current outline.

Is the Concrete domain testing all concrete knowledge?

No. The outline restricts the Concrete topic specifically to C-31a scope of work, and similarly restricts Roofing to C-42a/C-42b scope.

Can I bring reference books into the exam for these domains?

No. The exam is closed book. The 2018 IBC and other listed trade references are for studying only and are not admitted into the testing room.

How many questions do I need to answer correctly across all domains to pass?

You need 75% correct on the 80 scored questions, which is 60 correct answers, within the 240-minute time limit.

Understanding how the eight domains are weighted and scoped is the fastest way to convert raw study hours into exam-day results. Explore the full practice test library to drill each domain individually before attempting a timed, closed-book simulation of the real exam experience.

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