100+ Free ICC B1 Practice Questions

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Question 1

Score: 0/0

What is the minimum required size of a closet that can serve as the sole clothes closet in a bedroom?

No minimum closet size specified in the IRC

6 square feet of floor area

30 inches deep by 48 inches wide

24 inches deep by 36 inches wide

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2026 Statistics

Key Facts: ICC B1 Exam

60 Qs

Exam Questions

Open-book

2 hrs

Time Limit

2 min/question

Passing Score

Scaled score

$85-$150

Exam Fee

ICC member discount

IRC

Reference Code

Open-book allowed

50 States

Recognition

ICC certification

The ICC B1 exam has 60 multiple-choice questions with a 2-hour time limit in an open-book format. You must score at least 75 on a scaled score (approximately 75% correct, or 45 of 60 questions). The exam is based entirely on the International Residential Code (IRC) Chapters 1-11. The exam fee ranges from $85-$150 depending on ICC membership status. Testing is available at Pearson VUE centers or via ICC PRONTO remote proctoring 24/7.

Sample ICC B1 Practice Questions

Try these sample questions to test your ICC B1 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to the IRC, what is the minimum width of a hallway in a residential dwelling?

A.30 inches

B.36 inches

C.42 inches

D.48 inches

Explanation: The IRC requires a minimum hallway width of 36 inches (3 feet) in residential dwellings to ensure safe passage and emergency egress. This measurement is clear width between finished walls. The 36-inch minimum allows for reasonable movement of furniture and passage during emergencies. Exam tip: Know common dimensional requirements — they appear frequently on the B1 exam. Tab this section in your IRC for quick reference.

2What is the maximum riser height for residential stairs as specified by the IRC?

A.7 inches

B.7-3/4 inches

C.8 inches

D.8-1/4 inches

Explanation: The IRC specifies a maximum riser height of 7-3/4 inches (7.75 inches) for residential stairs. Additionally, the greatest riser height within a flight of stairs shall not exceed the smallest by more than 3/8 inch to ensure uniformity. Inconsistent risers are a leading cause of stair falls. Exam tip: Pair this with the minimum tread depth of 10 inches — both values are tested frequently on the B1 exam.

3What is the minimum depth required for a residential footing in areas subject to frost?

A.6 inches below the frost line

B.12 inches below the frost line

C.At or below the frost line

D.24 inches below grade

Explanation: The IRC requires footings to extend to at or below the frost line for the jurisdiction, or at least 12 inches below the undisturbed ground surface, whichever is deeper. This prevents frost heave from damaging the foundation. Local building officials determine the frost depth based on climate data. Exam tip: The frost line depth varies significantly by region — always check the local jurisdiction's requirements, as this is a common B1 exam question.

4What is the minimum thickness of a residential concrete slab-on-grade per the IRC?

A.2-1/2 inches

B.3 inches

C.3-1/2 inches

D.4 inches

Explanation: The IRC requires a minimum concrete slab-on-grade thickness of 3-1/2 inches. The slab must be placed on a minimum 4-inch base of clean graded gravel or sand fill. A vapor retarder is required between the slab and the fill when the slab is below grade or between the slab and any habitable or usable space. Exam tip: The 3-1/2 inch minimum is for standard slabs — thickened edges (turned-down footings) may be required where the slab also serves as the footing.

5According to the IRC, what is the minimum ceiling height for habitable rooms?

A.6 feet 8 inches

B.7 feet

C.7 feet 6 inches

D.8 feet

Explanation: The IRC requires a minimum ceiling height of 7 feet for habitable rooms, hallways, and portions of basements with habitable space. Bathrooms, toilet rooms, and laundry rooms must have a minimum ceiling height of 6 feet 8 inches. Beams and girders may project below the required height up to a minimum of 6 feet 4 inches. Exam tip: For rooms with sloped ceilings, at least 50% of the required floor area must have a ceiling height of at least 7 feet, with no portion less than 5 feet.

6What is the minimum bearing width for a standard residential footing supporting a two-story wood-frame wall on normal soil?

A.10 inches

B.12 inches

C.15 inches

D.18 inches

Explanation: Per IRC Table R401.4.1, a two-story wood-frame wall on soil with a load-bearing capacity of 2,000 psf requires a minimum footing width of 15 inches. A one-story wall requires 12 inches, and a three-story wall requires 23 inches. The footing thickness must be at least 6 inches or equal to the projection beyond the foundation wall, whichever is greater. Exam tip: Know how to read the footing size table in the IRC — it's based on number of stories, wall type, and soil bearing capacity.

7What is the maximum span for a 2x10 floor joist at 16 inches on center using No. 2 Douglas Fir-Larch lumber in a living area?

A.14 feet 6 inches

B.16 feet 1 inch

C.17 feet 4 inches

D.18 feet 8 inches

Explanation: Per the IRC floor joist span tables, a 2x10 No. 2 Douglas Fir-Larch joist at 16 inches on center can span approximately 16 feet 1 inch for a living area (40 psf live load). Span values depend on lumber species, grade, joist spacing, and dead load. Always refer to the specific span table in the IRC for exact values. Exam tip: Be comfortable looking up span tables quickly during the exam — know which table to use for floor joists vs. ceiling joists vs. rafters.

8What minimum fire-resistance rating is required for a garage separation wall from the dwelling per the IRC?

A.No separation required

B.1/2-inch gypsum board or equivalent

C.5/8-inch Type X gypsum board

D.One-hour fire-resistance rated assembly

Explanation: The IRC requires a minimum separation between an attached garage and the dwelling of not less than 1/2-inch gypsum board applied to the garage side. If the garage is beneath habitable rooms, 5/8-inch Type X gypsum board is required. This separation protects the dwelling from fire and carbon monoxide originating in the garage. Exam tip: Doors between the garage and dwelling must be solid wood, solid or honeycomb core steel, or 20-minute fire-rated — no pet doors or openings allowed.

9What is the required minimum width for an emergency escape and rescue opening (egress window) per the IRC?

A.18 inches

B.20 inches

C.22 inches

D.24 inches

Explanation: The IRC requires emergency escape and rescue openings to have a minimum net clear width of 20 inches. Additionally, they must have a minimum net clear height of 24 inches, and a minimum net clear opening area of 5.7 square feet (5.0 square feet at grade floor level). The sill height cannot exceed 44 inches from the floor. Exam tip: Remember the egress window requirements: 20 wide, 24 high, 5.7 sq ft area, 44-inch max sill — these are among the most frequently tested B1 topics.

10According to the IRC, what is the minimum tread depth for residential stairs?

A.9 inches

B.10 inches

C.11 inches

D.12 inches

Explanation: The IRC requires a minimum tread depth of 10 inches for residential stairs, measured horizontally between the nosing of adjacent treads. The nosing projection must be between 3/4 inch and 1-1/4 inches. Like risers, treads must be uniform within a flight, with the largest tread depth not exceeding the smallest by more than 3/8 inch. Exam tip: Remember the stair formula — max riser 7-3/4 inches, min tread 10 inches. Nosings are required when treads are less than 11 inches.

About the ICC B1 Exam

The ICC Residential Building Inspector (B1) exam is administered by the International Code Council and certifies individuals to inspect one- and two-family dwellings, townhomes up to three stories, and accessory structures for compliance with the International Residential Code (IRC). The open-book exam tests knowledge of building planning, foundations, floor construction, wall construction, roof/ceiling construction, and public safety requirements. ICC B1 certification is recognized in all 50 states and is a critical credential for building inspection careers.

Questions

60 scored questions

Time Limit

2 hours

Passing Score

75 (scaled score)

Exam Fee

$85-$150 (ICC (Pearson VUE / PRONTO))

ICC B1 Exam Content Outline

Code Administration

Building official authority, permits, inspections, certificates of occupancy, and code scope

Building Planning

Stairs, egress windows, room dimensions, ceiling heights, doors, landings, and guards

18%

Footings and Foundations

Footing dimensions, foundation walls, anchor bolts, concrete specs, drainage, and waterproofing

14%

Floor Construction

Joist spans, bearing requirements, notching/boring, crawlspace, vapor retarders, and treated wood

27%

Wall Construction and Coverings

Stud spacing, headers, bracing, sheathing, fire separation, WRB, siding, and lumber grades

14%

Roof/Ceiling Construction

Rafter spans, sheathing, underlayment, flashing, ventilation, collar ties, and fastening

17%

Public Safety

Smoke/CO alarms, guards, handrails, safety glazing, fire blocking, and chimneys

How to Pass the ICC B1 Exam

What You Need to Know

Passing score: 75 (scaled score)
Exam length: 60 questions
Time limit: 2 hours
Exam fee: $85-$150

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ICC B1 Study Tips from Top Performers

1Tab your IRC codebook extensively — mark footing size tables, joist span tables, stair dimensions (7-3/4 max riser, 10-inch min tread), egress window requirements (20 wide, 24 high, 5.7 sq ft), and anchor bolt specs (1/2-inch, 7-inch embed, 6 feet on center)

2Focus heavily on Wall Construction (27% of exam) — know stud spacing, header sizing, wall bracing methods, fire separation between garage and dwelling, and sheathing requirements

3Master the footing and foundation tables — practice looking up footing widths by number of stories and soil bearing capacity, foundation wall thickness, and anchor bolt placement rules

4Practice timed code lookups — the open-book format only helps if you can find answers quickly. Aim to locate any IRC section within 30 seconds during practice sessions

5Know public safety requirements cold — smoke alarm placement (every bedroom, outside sleeping areas, every level), CO alarm locations, guard heights (34 inches at stairs, 36 inches at elevated surfaces), and baluster spacing (4-inch sphere test)

Frequently Asked Questions

What score do I need to pass the ICC B1 exam?

The ICC B1 exam requires a scaled score of 75 to pass, which corresponds to approximately 75% of questions answered correctly (about 45 out of 60 questions). If you pass, you see 'PASS' on your results — no numerical score is shown for passing candidates. If you fail, you receive a diagnostic report showing your performance by content area. The exam uses scaled scoring set by the ICC Exam Development Committee.

Is the ICC B1 exam open-book?

Yes, the ICC B1 exam is open-book. You are allowed to use the International Residential Code (IRC) as your reference during the exam. You can tab, highlight, and annotate your codebook. However, with only 2 minutes per question on average, you need to be very familiar with the IRC layout and able to find information quickly. Most successful candidates tab key sections and practice code lookups before the exam.

How hard is the ICC B1 exam?

The ICC B1 exam is moderately challenging despite being open-book. Wall Construction (27%) and Footings/Foundations (18%) make up nearly half the exam. The difficulty comes from time pressure — 60 questions in 2 hours requires efficient codebook navigation. Many questions require finding specific values in IRC tables. Candidates who practice with timed mock exams and develop a systematic approach to finding code sections have the highest success rates.

What codebook do I need for the ICC B1 exam?

The ICC B1 exam is based on the International Residential Code (IRC). Check the current exam bulletin on the ICC website to confirm which edition year is being tested. You can purchase the IRC from the ICC store or use a digital version through certain testing platforms. The exam covers IRC Chapters 1-11 focusing on administration, building planning, foundations, floors, walls, roofing, and life safety systems.

What jobs can I get with ICC B1 certification?

ICC B1 certification qualifies you for residential building inspector positions with city, county, and state building departments. Average salaries range from $45,000-$70,000 depending on location and experience. Many jurisdictions require ICC certification as a condition of employment. The B1 is often combined with other ICC certifications (plumbing, electrical, mechanical) for broader inspection authority. Some inspectors work as independent consultants or for private inspection firms.

How do I prepare for the ICC B1 exam?

Start by obtaining the correct IRC edition and reading Chapters 1-11. Tab critical sections like footing tables, span tables, stair requirements, and egress window dimensions. Use ICC's official study guide and practice exams. Practice finding code sections under time pressure. Focus heavily on Wall Construction (27%) and Footings/Foundations (18%). Complete at least 3 full-length timed practice exams before scheduling your test date.

100+ Free ICC B1 Practice Questions

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