NASCLA Commercial General Building • PSI • 115 Scored Questions • 5.5 Hours
Prepare for the California NASCLA General Contractor Exam with a practical study plan covering commercial building construction, project management, estimating, bidding, contracting, construction safety, sitework, concrete, masonry, structural steel, framing, roofing, and building systems.
The national examination is officially called the NASCLA Accredited Examination for Commercial General Building Contractors. It is administered by PSI and recognized by participating state contractor licensing agencies.
The exam contains 115 scored questions and 10 additional unscored pretest questions. Candidates have 330 minutes and need at least 81 correct scored answers to pass.
NASCLA is an open-book trade examination. Candidates may use approved reference books, but those books must follow PSI's current edition and preparation requirements.
California has an important licensing distinction. It does not automatically accept NASCLA as a substitute for the state contractor trade exam for every applicant.
Instead, the California Contractors State License Board (CSLB) describes a specific NASCLA-based trade-exam waiver pathway for qualifying B-General Building contractor applicants.
That pathway generally requires the applicant to have been the qualifying individual on an equivalent out-of-state general building contractor license in good standing for the previous five years, to have passed NASCLA, and to submit official documentation for CSLB review.
Applicants who do not meet the waiver conditions generally follow California's standard B-General Building Contractor trade examination route, which is a different, closed-book exam.
Contractor Exam Preps offers the California NASCLA Complete Book Set, including construction reference materials used to prepare for the national examination.
The store also offers California NASCLA Highlighted and Tabbed Books and a California NASCLA Online Exam Prep Course.
This guide explains both the national exam and California's separate licensing requirements, helping you avoid studying for the wrong test.
California NASCLA licensing warning: Passing NASCLA does not give you a California contractor license. Under CSLB's specified waiver pathway, a qualifying applicant must have an equivalent out-of-state general building contractor license, have been its qualifier for at least the previous five years in good standing, and meet the documentation and NASCLA-result requirements. CSLB makes the waiver decision. California Law and Business, licensing qualifications, bonding, and other requirements may still apply. If you do not qualify for this pathway, prepare for the standard California B-General Building contractor examination.
NASCLA stands for the National Association of State Contractors Licensing Agencies. Its accredited Commercial General Building exam measures construction and project management knowledge across many areas of commercial construction.
It includes construction planning, bidding, estimating, contracts, project administration, site preparation, concrete, masonry, structural steel, framing, roofing, finishes, building systems, and workplace safety.
The examination is designed to help qualifying contractors apply in participating states without always repeating another state-specific trade examination.
That does not create a national contractor license. Each licensing board decides whether NASCLA is accepted and what other requirements apply.
In California, the NASCLA exam is relevant to a limited waiver route for qualifying applicants pursuing the CSLB B-General Building classification.
A B-General Building contractor manages construction involving multiple building trades, subject to the state classification rules.
The contractor may coordinate foundations, framing, roofing, doors, windows, finishes, and other construction activities while supervising subcontractors and managing the overall project.
Contracting also requires understanding costs, schedules, safety, permits, inspections, and business responsibilities.
The national NASCLA test includes twelve subject categories because building contractors must manage many different construction systems.
The three largest categories are Procurement and Contracting, General Requirements, and Site Construction. These alone account for 71 of the 115 scored questions.
Official examination: NASCLA Accredited Examination for Commercial General Building Contractors.
National test provider: PSI.
California licensing authority: CSLB.
National exam: 115 scored, 10 unscored, 330 minutes.
Passing: 81 correct scored answers.
California application: Separate from the NASCLA examination.
The correct pathway depends on your contractor experience and current out-of-state licensing history.
| Step | Requirement | What to Verify |
|---|---|---|
| Choose the Classification | California B-General Building | Confirm your planned construction work fits the B classification. |
| Review NASCLA Waiver Eligibility | Equivalent Out-of-State License | Confirm an equivalent general building classification recognized by CSLB. |
| Check Five-Year History | Qualifying License Record | Verify the out-of-state license was in good standing for the required period. |
| Verify Your Role | Qualifying Individual | You must meet CSLB's required qualifier-history conditions. |
| Register for NASCLA | National Exam Eligibility | Apply through NASCLA before scheduling with PSI. |
| Study Approved Books | Current PSI Reference List | Prepare the correct editions and compliant permanent tabs. |
| Pass NASCLA | 81 Correct Answers | Pass the 115-scored-question national examination. |
| Submit Official Results | NASCLA Score Transcript | Have the official score sent to CSLB using NASCLA's process. |
| Apply to CSLB | California Contractor Application | Submit experience and licensing documentation with the correct application. |
| Request Waiver Review | CSLB Decision | CSLB determines whether the B trade exam can be waived. |
| Complete Law and Business | Separate California Exam | Prepare and pass the state business exam unless separately exempt. |
| Complete Final Licensing | Bonding and Other Requirements | Meet all applicable CSLB conditions before receiving a license. |
NASCLA and the standard California B-General Building trade examination are different tests. Confirm which one your application requires before investing in study materials.
| Exam Detail | NASCLA Commercial Building | California B-General Building |
|---|---|---|
| Authority | NASCLA / PSI | CSLB |
| Exam Format | Open book | Closed book |
| Subject Categories | 12 | 5 |
| Scored Questions | 115 | Follow CSLB examination instructions |
| Unscored Questions | 10 | See CSLB instructions |
| Time Limit | 330 minutes | Follow CSLB scheduling notice |
| Passing Requirement | 81 correct scored answers | Determined by CSLB testing program |
| Reference Books | Current PSI-approved library | No personal reference books |
| Business Guide | NASCLA Basic 14th Edition | Separate California Law and Business study guide |
| California Trade Waiver | Conditional qualifying route | Regular trade exam otherwise applies |
National NASCLA: 125 total questions presented, including 10 unscored.
National passing: 81 out of 115 scored questions.
California B exam: Closed book, with its own published content outline.
Important: The NASCLA exam does not automatically replace California Law and Business.
NASCLA covers twelve construction subjects, ranging from contracts and estimating to building structure and mechanical systems.
Procurement and Contracting Requirements is the largest subject with 31 questions. Study construction contracts, subcontracting, procurement, bidding, estimating, purchasing, payment administration, and change orders.
General Requirements contains 25 questions. Study construction management, workplace safety, code requirements, scheduling, accessibility, documentation, supervision, and project quality.
Site Construction includes 15 questions. Review excavation, grading, drainage, site utilities, erosion control, and stormwater management.
These three categories combine for 71 scored questions, which is approximately 61.7% of the national examination.
Concrete contains six questions. Study foundations, reinforcement, placing methods, curing, and material quality.
Metals contains six questions. Review structural steel, joists, connections, and metal decking.
Mechanical and Plumbing Systems includes six questions involving building equipment and coordination.
Wood, Finishes, and Thermal and Moisture Protection each contain five questions.
Masonry and Doors, Windows, and Glazing each contain four questions.
Electrical Systems contains three questions covering general contractor coordination and building electrical concepts.
The exam is open book, but you need to know which reference contains the answer. A large book collection is helpful only when you can find information quickly.
Start with the official NASCLA content outline. Use its topic weights to build your study schedule rather than giving every construction subject the same amount of time.
Focus first on Procurement and Contracting, General Requirements, and Site Construction. Together, those categories represent more than half of the examination.
Next, organize your reference books by topic. Commercial general building preparation involves many publications, so knowing which book covers a subject is essential.
Contracts: Study bidding, subcontract agreements, estimating, procurement, and project documentation.
Management: Review scheduling, site supervision, quality control, and contract administration.
Building Codes: Study occupancy, construction types, accessibility, and the International Building Code.
Safety: Review OSHA construction regulations, fall protection, excavation hazards, and protective equipment.
Sitework: Study grading, excavation, drainage, underground systems, and erosion control.
Structures: Review foundations, concrete, reinforcing steel, masonry, structural metals, and wood framing.
Building Envelope: Study roofing, weather protection, insulation, windows, and glazing.
Building Systems: Review mechanical, plumbing, and electrical coordination.
Complete practice questions with the correct references nearby. When you miss a question, locate the actual explanation or code requirement before moving on.
For guided preparation, use the California NASCLA Commercial General Building Online Course.
NASCLA contractors must understand how construction systems work together. A commercial building involves site preparation, foundations, structural framing, roofing, openings, and multiple mechanical and electrical systems.
Simplified commercial building illustration for exam study.
Follow these eight steps to prepare for NASCLA and determine whether you qualify for California's conditional trade-exam waiver.
Review the CSLB B-General Building classification and make sure your planned work fits its scope.
Confirm you hold an equivalent out-of-state general building contractor license.
Review CSLB's good-standing and qualifying-individual requirements for the waiver pathway.
Complete the national examination application and receive authorization to schedule through PSI.
Prepare the official references, learn subject locations, and complete practice questions.
Complete 115 scored questions and ten unscored items, with at least 81 scored answers correct.
Send the NASCLA score transcript and necessary license verification for CSLB review.
Meet Law and Business, application, bonding, and other requirements before receiving a California license.
The national exam uses twelve subject categories. These bars represent the approximate percentage of 115 scored questions in each area.
Total: 115 scored questions.
High-priority topics: Procurement, General Requirements, and Site Construction.
Combined: 71 scored questions, about 61.7%.
Pretest: The ten additional unscored questions are not included in these counts.
The NASCLA exam uses a large open-book reference library. Always check the official PSI bulletin for approved titles, editions, and book-marking restrictions.
| Reference | Edition | Purpose |
|---|---|---|
| International Building Code | 2021 or 2024 | Commercial code requirements. |
| NASCLA Contractors Guide, Basic | 14th Edition | Business, contracting, project management. |
| Construction Jobsite Management | Approved 4th or 5th Edition | Field management. |
| Construction Project Management | Approved 4th or 5th Edition | Scheduling and project controls. |
| OSHA Construction Regulations | Approved 29 CFR 1926 | Construction safety. |
| ICC A117.1 | 2017 | Building accessibility. |
| ACI 318 Structural Concrete | PSI-approved edition | Structural concrete. |
| BCSI Wood Truss Guide | PSI-approved edition | Truss installation and bracing. |
| Carpentry and Building Construction | 2016 | Framing and carpentry. |
| Mechanical and Electrical Systems for Construction Managers | 4th Edition | Building systems. |
| Gypsum Construction Handbook | 7th Edition | Interior finishes. |
| Modern Masonry | 9th Edition | Brick and block construction. |
| Principles and Practices of Commercial Construction | 11th Edition | Commercial building methods. |
| Pipe and Excavation Contracting | 2011 | Excavation and utilities. |
| Roofing Construction and Estimating | PSI-approved edition | Roofing and estimates. |
| Placing Reinforcing Bars | 10th Edition | Concrete reinforcement. |
| Steel Deck Institute Manual | 2016 | Metal decking. |
| Contractor's Guide to Quality Concrete Construction | 4th Edition | Concrete placement and quality. |
| Post-Tensioning Field Fundamentals | 3rd Edition | Post-tensioned concrete. |
| Green Building Fundamentals | 2nd Edition | Sustainable construction. |
| Stormwater Pollution Prevention Plan Guide | EPA publication | Stormwater and erosion control. |
| Technical Digest No. 9 | 3rd Edition | Steel joist erection. |
| Erectors' Manual for Precast Concrete | 2nd Edition | Precast erection. |
| ANSI/EIMA 99-A | 2017 | Exterior insulation and finish systems. |
Important: The national NASCLA Basic 14th Edition is not a substitute for California Law and Business preparation.
Open-book preparation: Check PSI-approved books and editions before purchasing.
Code editions: Follow the permitted IBC versions in the current bulletin.
NASCLA allows approved references, but this does not make the examination easy. Searching through construction manuals can use valuable time when you do not know which book contains an answer.
NASCLA: Practice using approved references.
California B: Prepare separately for its closed-book format if required.
Testing rule: Check the latest PSI policy on tabs, highlighting, notes, and calculators.
California's B-General Building classification covers construction involving building structures and multiple construction trades within the scope established by CSLB.
A general building contractor may manage projects involving foundations, framing, roofing, exterior finishes, doors, windows, and other construction systems.
The contractor is responsible for coordinating the work, planning schedules, managing subcontractors, reviewing plans, and keeping the project within contract requirements.
California B-General Building contractors must follow the state's rules regarding work involving unrelated building trades.
The classification generally applies to projects involving at least two unrelated construction trades, subject to specific rules and exceptions.
Some projects involving a single specialty trade require the proper specialty contractor license rather than a B classification alone.
For example, electrical, plumbing, and mechanical work may require properly licensed specialty contractors when applicable.
A general contractor should also understand building permits, inspections, site safety, and state contractor law.
Passing NASCLA does not expand the California B-General Building classification beyond its legal scope.
The license issued by CSLB, not the examination itself, determines the contractor's permitted business activities.
California classification: B-General Building.
Licensing authority: CSLB.
NASCLA: A possible conditional trade-exam waiver pathway.
Specialty work: Follow California classification and subcontractor requirements.
| Exam or Classification | Authority | Main Purpose |
|---|---|---|
| NASCLA Commercial General Building | NASCLA / PSI | National open-book trade exam recognized under qualifying state programs. |
| California B-General Building | CSLB | California building contractor license with state-defined scope. |
| California B Trade Exam | CSLB | Standard closed-book California general building examination. |
| California Law and Business | CSLB | Separate state contractor business examination. |
| California B-2 Residential Remodeling | CSLB | Separate residential remodeling contractor classification. |
| California C-10 Electrical | CSLB | Electrical contractor specialty classification. |
| California C-36 Plumbing | CSLB | Plumbing contractor specialty classification. |
California B topic weights: Core Trades 30%, Framing and Structural Components 20%, Finish Trades 20%, Planning and Estimating 15%, and Safety 15%.
NASCLA topic weights: Twelve national construction categories with a different distribution.
Important: These examinations should not be treated as interchangeable without CSLB waiver approval.
CSLB B-General Building Application
Special Out-of-State Licensing Route
California License Issuance
Waiver decision: CSLB decides whether the applicant qualifies.
Regular route: Applicants not eligible for the special waiver generally take the standard California B trade exam.
Licensing: Passing an exam does not authorize unlicensed contracting.
Use this schedule to build national NASCLA knowledge and practice the open-book format.
The NASCLA Commercial General Building examination can be difficult because it combines construction knowledge from many different trades.
It covers project management, contracts, estimating, construction safety, sitework, concrete, masonry, metals, framing, roofing, finishes, and building systems.
The national test has 115 scored questions, ten additional unscored questions, and a five-and-a-half-hour time limit.
One challenge is knowing which reference book contains the correct answer. With a large library, searching the wrong publication can waste valuable time.
Another challenge is the broad exam outline. A contractor who specializes in framing may know wood construction very well but have less experience with structural steel, procurement, or stormwater management.
That is why practice questions are important.
Begin with the three largest topic areas. Procurement and Contracting contains 31 questions, General Requirements contains 25, and Site Construction contains 15.
These subjects account for approximately 61.7% of the scored questions.
Then study the remaining construction topics and practice switching between reference books.
Review mistakes carefully. Instead of memorizing a practice answer, locate the rule or explanation supporting it.
For California applicants, there is an additional challenge: understanding whether NASCLA actually meets the requirements for a requested B-General Building trade-exam waiver.
Before studying, check that question with CSLB.
The difference between the NASCLA open-book test and California's regular closed-book B exam is too important to overlook.
National exam: Open book, 115 scored questions and ten unscored items.
Time: 330 minutes.
Passing: 81 correct scored answers.
After passing: Send official results and follow the CSLB application process.
Contractor Exam Preps offers California NASCLA construction reference packages, highlighted and tabbed books, and an online preparation course.
National Commercial Building References
Prepared Open-Book References
Guided Self-Paced Examination Preparation
National package: The NASCLA Complete Exam Prep Package offers another preparation option.
Business reference: The NASCLA Basic Business and Law Guide is a national exam reference, not the California CSLB Law and Business exam.
Before ordering: Verify package contents, code editions, course access, prices, and availability.
This custom contractor credential illustration features a California silhouette, commercial building, structural framing, crane, hard hat, and blueprints.
It represents examination preparation, not an official NASCLA certificate or California contractor license.
• NASCLA Commercial General Building
• PSI Examination
• 115 Scored Questions
• 10 Unscored Questions
• 330-Minute Exam
• 81 Correct to Pass
• Open-Book References
• Commercial Construction
• Contracts and Estimating
• Project Management
• Construction Safety
• Sitework and Foundations
• Concrete and Masonry
• Steel and Wood Framing
• Roofing and Finishes
• Building Systems
• CSLB B-General Building
• Conditional Trade-Exam Waiver
• California Law and Business
Study for the correct examination and confirm your California licensing pathway before scheduling.
California NASCLA Licensing
California recognizes NASCLA under a conditional B-General Building trade-exam waiver pathway for qualifying applicants. It is not a general replacement for the California trade examination.
No. CSLB must review the application and issue the California license.
The conditional waiver relates to the CSLB B-General Building trade examination.
The published pathway requires the applicant to have been the qualifier on an equivalent out-of-state general building contractor license in good standing for the specified five-year period.
No. CSLB reviews the licensing and examination documents before deciding whether the waiver applies.
Participating state agencies may recognize NASCLA, but each state has its own requirements.
National NASCLA Exam Format
There are 115 scored questions.
Yes. There are ten unscored pretest questions, making 125 questions presented.
330 minutes, or five and a half hours.
At least 81 of the 115 scored questions must be answered correctly.
Yes. It permits approved references that meet PSI's published requirements.
PSI administers the national commercial building examination.
Exam Topics and Reference Books
Procurement and Contracting Requirements, with 31 scored questions.
25 scored questions.
15 scored questions.
Yes. Concrete and Metals each have six scored questions.
The July 2026 PSI bulletin lists the 2021 or 2024 International Building Code. Always confirm against the current bulletin.
The national reference list identifies the NASCLA Contractors Guide to Business, Law and Project Management, Basic 14th Edition.
Yes, subject to PSI's current reference preparation rules.
Yes, when prepared according to PSI's rules.
No. Temporary tabs and unauthorized added papers are prohibited.
California B-General Building Examination
No. The CSLB B-General Building trade exam is closed book.
Core Trades, Framing and Structural Components, Finish Trades, Planning and Estimating, and Safety.
Generally yes, unless a separate applicable waiver or exemption is approved.
CSLB generally requires four years of qualifying journey-level or higher experience within the previous ten years, subject to approved credit rules.
The standard CSLB contractor bond is $25,000, with additional requirements possible for some business types and qualifiers.
Registration and Study Products
Apply through NASCLA. After approval, follow PSI scheduling instructions.
The current bulletin describes a one-year examination eligibility period.
Yes. Contractor Exam Preps lists a California NASCLA Commercial General Building Complete Book Set.
Yes. The store offers prepared California NASCLA references. Confirm book editions and current availability before buying.
Yes. Contractor Exam Preps sells a California NASCLA Commercial General Building Online Exam Prep Course.
No. Study resources cannot guarantee examination passage, waiver approval, or California license issuance.
Watch this related 1 Exam Prep video about the NASCLA Commercial General Building examination, open-book preparation, reference materials, and contractor study strategies.
The video supports general national exam preparation. For California licensing, follow CSLB's waiver requirements rather than assuming every NASCLA passing result qualifies for a California B-General Building license.
Video: NASCLA Commercial General Building Contractor.
Channel: 1 Exam Prep.
National exam: Open book, 115 scored questions and ten unscored questions.
California reminder: CSLB determines whether a B trade-exam waiver applies.
Use Contractor Exam Preps for NASCLA book sets, online courses, highlighted references, and national examination practice. Use CSLB and NASCLA for licensing and testing rules.
NASCLA: National open-book Commercial General Building exam.
California B: Separate closed-book state examination.
Conditional waiver: Check equivalent out-of-state qualifier experience and CSLB approval.
Books: Verify editions, availability, and shipping before ordering.
Prepare for the NASCLA Commercial General Building examination with stronger knowledge of contracts, project management, sitework, construction safety, concrete, masonry, steel, framing, roofing, finishes, and building systems.
The national exam contains 115 scored questions, plus ten unscored pretest questions. Candidates have 330 minutes and need at least 81 correct scored answers to pass.
The examination is open book, so learning the approved reference library is an important part of preparation.
Focus on Procurement and Contracting, General Requirements, and Site Construction first. These three topics account for more than 60% of the scored exam.
Complete repeated reference lookup exercises and timed practice exams. Study the smaller technical subjects as well, because a general contractor needs knowledge across different trades.
California applicants should remember that NASCLA is a conditional trade-exam waiver option for qualifying B-General Building applicants.
The required out-of-state licensing and qualifier history must meet CSLB rules, and the Board makes the final waiver decision.
Applicants who are not eligible for the waiver generally prepare for California's separate closed-book B-General Building examination.
California Law and Business, business qualifications, bonding, and other licensing requirements may still apply.
Contractor Exam Preps offers California NASCLA complete book sets, highlighted and tabbed references, and online exam preparation to support your study goals.
Choose the correct licensing pathway, use current approved materials, and build a realistic study calendar.
A successful general contractor understands both construction work and the business responsibilities that come with managing a project. Strong exam preparation is a useful place to build those skills.
Find more contractor licensing and examination resources at ContractorExamPreps.com.
