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200+ Free NASCLA Contractor Practice Questions

Prepare for the NASCLA Accredited Examination for Commercial General Building Contractors exam with instant access — no signup required.

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VideoNASCLA Contractor Exam Guide 2026: 115 Scored Questions and 24 ReferencesThis examArticleNASCLA Contractor Exam Guide 2026: 115 Scored Questions and 24 References16 min read
2026 Statistics

Key Facts: NASCLA Contractor Exam

125

Displayed Items

PSI

81/115

Passing Score

81 of 115 scored questions

330 min

Exam Duration

PSI

$130

PSI Exam Fee

PSI

20

Participating Agencies

NASCLA

24

Reference Entries

PSI bulletin, plus onsite diagram or blueprint packet

Candidates see 125 items: 115 scored questions plus 10 unidentified pretest items, with 330 minutes and an exact passing standard of 81 scored answers. The July 7, 2026 PSI bulletin lists 12 official subject areas and 24 approved reference entries, plus an onsite diagram or blueprint packet. NASCLA charges $65 to apply, PSI charges $130 for the examination, and each agency transcript costs $45.

Sample NASCLA Contractor Practice Questions

Try these sample questions to test your NASCLA Contractor exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1A contractor is preparing a bid for a commercial office building. According to standard construction estimating practices, which cost component typically represents the largest percentage of the total project cost?
A.General conditions and overhead
B.Labor costs
C.Material costs
D.Subcontractor costs
Explanation: In most commercial construction projects, subcontractor costs represent the largest percentage of total project cost, often 60-80% of the contract amount. This is because specialty work (electrical, mechanical, plumbing, concrete, steel) is typically subcontracted. While labor and materials are significant, the aggregated costs of all subcontractors typically exceed any single direct cost category.
2Under OSHA 29 CFR 1926, what is the minimum distance that a ladder must extend above the upper landing surface when used for access?
A.1 foot
B.2 feet
C.3 feet
D.4 feet
Explanation: OSHA requires that non-self-supporting ladders extend at least 3 feet above the upper landing surface to provide a secure handhold for workers transitioning between the ladder and the landing. This requirement ensures workers have adequate support when stepping on or off the ladder at elevated surfaces.
3A project schedule shows that Activity B cannot start until Activity A is completed. What type of relationship exists between these activities?
A.Start-to-start
B.Finish-to-start
C.Finish-to-finish
D.Start-to-finish
Explanation: A finish-to-start (FS) relationship is the most common dependency in construction scheduling, where the successor activity (B) cannot begin until the predecessor activity (A) is completed. This sequential relationship ensures proper work flow and prevents conflicts between trades or activities.
4According to the International Building Code (IBC), what is the primary factor that determines the required fire resistance rating of building elements?
A.Building height only
B.Type of construction and occupancy classification
C.Location within the jurisdiction
D.Architectural design style
Explanation: The IBC establishes fire resistance requirements based on two primary factors: the type of construction (Type I through V, with further subdivisions) and the occupancy classification (Group A through U). These factors determine the required fire resistance ratings for structural elements, walls, and floor/ceiling assemblies to ensure life safety and property protection.
5A contractor receives a notice of award for a public works project. According to standard contract documents (AIA A201 or similar), when does the contract time typically begin?
A.Upon receipt of the notice of award
B.On the date established in the notice to proceed
C.When the first materials are delivered to the site
D.Upon signing of the final contract documents
Explanation: The contract time generally begins on the date established in the notice to proceed issued by the owner or architect. This formal document authorizes the contractor to begin work and establishes the project schedule baseline. The notice of award precedes this but does not typically trigger the contract time clock.
6Under OSHA excavation safety standards (29 CFR 1926 Subpart P), at what depth is a protective system required for trenches?
A.4 feet
B.5 feet
C.6 feet
D.8 feet
Explanation: OSHA requires protective systems (sloping, benching, shoring, or shielding) for all excavations 5 feet or deeper. At depths less than 5 feet, a protective system may still be required if the competent person determines there is a potential for cave-in based on soil conditions, water content, or other factors.
7A project experiences an unforeseen subsurface condition that requires additional work and extends the schedule. Under a typical AIA A201 General Conditions contract, what type of claim has the contractor most likely encountered?
A.A claim for acceleration
B.A claim for a differing site condition (Type I or Type II)
C.A claim for loss of productivity
D.A claim for termination for convenience
Explanation: Unforeseen subsurface conditions typically constitute a differing site condition claim. Type I DSC involves conditions that differ materially from those indicated in the contract documents. Type II involves unusual conditions of an unusual nature that differ materially from those ordinarily encountered. Both may entitle the contractor to additional time and/or compensation.
8In construction cost estimating, what does the term "overhead" typically include?
A.Only direct project costs such as labor and materials
B.Office expenses, insurance, and administrative salaries not attributable to a specific project
C.Only equipment rental costs
D.Profit margin and contingency only
Explanation: Overhead in construction estimating refers to indirect costs necessary to run the business but not directly attributable to a specific project. This includes office rent, administrative salaries, general liability insurance, utilities, and other operational expenses. These costs must be distributed across all projects and recovered through markup.
9According to OSHA 29 CFR 1926.451, at what height must employees on scaffolds be protected by guardrails or personal fall arrest systems?
A.4 feet
B.6 feet
C.10 feet
D.12 feet
Explanation: OSHA requires fall protection on scaffolds at heights of 10 feet or more above a lower level. This can be provided by guardrail systems, personal fall arrest systems, or a combination. The 10-foot threshold is specific to scaffolds and differs from general construction (6 feet) and general industry (4 feet) requirements.
10A contractor is preparing a preliminary estimate based on historical data from similar projects. Which estimating method is being used?
A.Unit price estimating
B.Assembly or systems estimating
C.Parametric or conceptual estimating
D.Detailed quantity takeoff
Explanation: Parametric or conceptual estimating uses historical data and statistical relationships between project parameters (such as square footage, number of rooms, or building type) and costs. This method is useful in early project phases when detailed design information is not yet available, providing a rough order of magnitude estimate.

About the NASCLA Contractor Exam

The NASCLA Accredited Examination for Commercial General Building Contractors is an open-book trade examination. Twenty agencies across 17 states and the U.S. Virgin Islands accept it as a trade-exam waiver while retaining their own license requirements.

Questions

125 scored questions

Time Limit

330 minutes

Passing Score

81 of 115 scored questions (approximately 70.4%)

Exam Fee

$130 PSI examination fee; $65 NASCLA application is separate (NASCLA / PSI)

NASCLA Contractor Exam Content Outline

25 items (21.7%)

General Requirements

Official PSI subject area; PSI does not publish task-level subdomain weights

31 items (27.0%)

Procurement and Contracting Requirements

Official PSI subject area; PSI does not publish task-level subdomain weights

15 items (13.0%)

Site Construction

Official PSI subject area; PSI does not publish task-level subdomain weights

6 items (5.2%)

Concrete

Official PSI subject area; no narrower public blueprint is published

4 items (3.5%)

Masonry

Official PSI subject area; no narrower public blueprint is published

6 items (5.2%)

Metals

Official PSI subject area; no narrower public blueprint is published

5 items (4.3%)

Wood

Official PSI subject area; no narrower public blueprint is published

5 items (4.3%)

Thermal and Moisture Protection

Official PSI subject area; no narrower public blueprint is published

4 items (3.5%)

Doors, Windows, and Glazing

Official PSI subject area; no narrower public blueprint is published

5 items (4.3%)

Finishes

Official PSI subject area; no narrower public blueprint is published

6 items (5.2%)

Mechanical and Plumbing Systems

Official PSI subject area; no narrower public blueprint is published

3 items (2.6%)

Electrical Systems

Official PSI subject area; no narrower public blueprint is published

How to Pass the NASCLA Contractor Exam

What You Need to Know

  • Passing score: 81 of 115 scored questions (approximately 70.4%)
  • Exam length: 125 questions
  • Time limit: 330 minutes
  • Exam fee: $130 PSI examination fee; $65 NASCLA application is separate

Keys to Passing

  • Work through all 200 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NASCLA Contractor Study Tips from Top Performers

1Allocate the largest editorial study block to Procurement and Contracting Requirements because PSI assigns it 31 scored items
2Allocate the next-largest block to General Requirements because PSI assigns it 25 scored items without publishing subdomain weights
3Use only permanent tabs, highlighting, underlining, and indexing permitted by the current PSI bulletin; remove extra papers and temporary tabs
4Study construction math: estimating quantities, calculating areas/volumes, and understanding specifications
5Use the current 24-entry reference list and remember that PSI supplies the diagram or blueprint packet onsite
6Practice with 125 displayed items in 330 minutes so the simulation includes the 10 unidentified pretest items

Frequently Asked Questions

What is the NASCLA contractor exam?

The NASCLA Accredited Examination is an open-book trade exam accepted by 20 agencies across 17 states and the U.S. Virgin Islands. It is not a contractor license.

How many questions are on the NASCLA exam?

Candidates see 125 items: 115 scored questions plus 10 unidentified pretest items. The time limit is 330 minutes, and 81 scored answers are required to pass.

What are the prerequisites for the NASCLA exam?

NASCLA publishes no prerequisite to apply for or sit for the exam. License eligibility is separate. NASCLA charges $65 to apply, and PSI charges $130 for the examination.

Is the NASCLA exam open-book?

Yes. The bulletin lists 24 reference entries and an onsite diagram or blueprint packet. Code editions must match the list; non-code alternatives are used at the candidate's risk.

How should I prepare for the NASCLA exam?

Use an editorial schedule based on the official counts: Procurement and Contracting has 31 scored items and General Requirements has 25. Simulate all 125 displayed items in 330 minutes.