Free Contractor License Practice Exam

Review 5 multiple-choice questions covering IBC, IRC, and IECC building codes. Each question shows the answer, explanation, and code reference so you can study immediately.

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  • We selected 5 beginner-friendly questions to show how our explanations work.
  • Each question still uses the same answer choices as the real exam, but the correct option is highlighted.
  • Use the code references to see exactly where the requirement lives in the IBC, IRC, or IECC.
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Question 1 of 5
How far below undisturbed ground must footings extend in frost-susceptible areas?
A. 6 inches below the frost line
B. 12 inches below the frost line
C. At the frost line
D. 18 inches below the frost line

Explanation

IRC Section R403.1.4.1 requires footing bottoms to be placed 12 inches below undisturbed soil so frost cannot heave or lift the foundation.

2021 IRC R403.1.4.1
Question 2 of 5
What is the minimum footing width for a one-story wood-frame wall?
A. 8 inches
B. 10 inches
C. 12 inches
D. 15 inches

Explanation

Table R403.1 sets a 12-inch minimum footing width for one-story construction to provide adequate bearing capacity for typical soil conditions.

2021 IRC Table R403.1
Question 3 of 5
What is the minimum clear width for an accessible route inside a building?
A. 32 inches
B. 36 inches
C. 44 inches
D. 48 inches

Explanation

IBC 1109.2 references ADA Standards requiring a 36-inch clear width so mobility devices can pass safely through corridors and doorways.

2021 IBC 1109.2 / ADA 403.5
Question 4 of 5
What ceiling insulation R-value is required in Climate Zone 4?
A. R-30
B. R-38
C. R-49
D. R-60

Explanation

IECC Table R402.1.2 mandates R-38 ceiling insulation for Zone 4 to limit heat loss through the roof assembly.

2021 IECC Table R402.1.2
Question 5 of 5
What is the minimum slope for a horizontal 3-inch drain pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot

Explanation

Section P3103.1 lists the minimum slopes required to maintain flow. For 3-inch pipe, 1/4 inch per foot ensures adequate velocity to move solids.

2021 IRC P3103.1

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