ICC B2 Exam Prep
Start this ICC B2 exam prep with 16 free, original, unofficial starter questions for the Commercial Building Inspector exam, then use the six-week study plan. Code-specific items use the 2024 International Building Code (IBC); items labeled supplied data or supplied criteria use the information given.
Free B2 practice questions
Public Safety and Special Construction
B2-01 · 2024 IBC · Sprinkler scope
A Group F-1 fire area measures 5,400 square feet. Within it, 3,100 square feet are used for cabinetmaking with equipment that generates combustible dust. Considering only 2024 IBC Section 903.2.4.1, what area must the automatic sprinkler system protect?
- A. Only the woodworking machines
- B. Only the 3,100-square-foot woodworking area
- C. The entire 5,400-square-foot fire area
- D. No area, because the fire area is smaller than 12,000 square feet
Show answer and explanation for B2-01
Answer: C. Section 903.2.4.1 requires sprinkler protection for a Group F-1 fire area that contains woodworking operations over 2,500 square feet using equipment that generates combustible dust. Here the woodworking area is 3,100 square feet, so the fire area that contains it is protected. The rule doesn't apply to just the woodworking area.
- A and B shrink the scope to the machines or the woodworking area. The requirement attaches to the fire area.
- D uses a different trigger. The 12,000-square-foot threshold belongs to the general F-1 rule in Section 903.2.4. Section 903.2.4.1 is a separate trigger that can apply below it. At 2,500 square feet or less, the woodworking operation would not activate this specific trigger. Other sprinkler requirements still have to be evaluated.
This answers one provision only. It isn't a full sprinkler design review.
Source: ICC Code Corner: 2024 IBC Section 903.2.4.1, Woodworking Operations (Beth Tubbs, May 23, 2025)
Answer: C. Section 903.2.4.1 requires sprinkler protection for a Group F-1 fire area that contains woodworking operations over 2,500 square feet using equipment that generates combustible dust. Here the woodworking area is 3,100 square feet, so the fire area that contains it is protected. The rule doesn't apply to just the woodworking area.
- A and B shrink the scope to the machines or the woodworking area. The requirement attaches to the fire area.
- D uses a different trigger. The 12,000-square-foot threshold belongs to the general F-1 rule in Section 903.2.4. Section 903.2.4.1 is a separate trigger that can apply below it. At 2,500 square feet or less, the woodworking operation would not activate this specific trigger. Other sprinkler requirements still have to be evaluated.
This answers one provision only. It isn't a full sprinkler design review.
Source: ICC Code Corner: 2024 IBC Section 903.2.4.1, Woodworking Operations (Beth Tubbs, May 23, 2025)
B2-02 · Navigation · Occupant load
You need the occupant load factor for a business area to check egress width. Which chapter do you open first?
- A. Chapter 3, Occupancy Classification and Use
- B. Chapter 5, General Building Heights and Areas
- C. Chapter 10, Means of Egress
- D. Chapter 11, Accessibility
Show answer and explanation for B2-02
Answer: C. Occupant load is calculated in Chapter 10, alongside the egress capacity it drives.
- A is the classic trap. Chapter 3 tells you the occupancy group (for example, Group B). It doesn't tell you how many people to design the exits for.
- B controls allowable height and area.
- D covers accessible routes and elements, not occupant counts.
When a question says "occupant load," think Chapter 10. When it says "occupancy classification," think Chapter 3.
Source: 2024 IBC Code and Commentary, Volume 1: contents (PDF), Chapter 10; official sample (PDF), printed page 3-3, occupant-load discussion referencing Table 1004.5
Answer: C. Occupant load is calculated in Chapter 10, alongside the egress capacity it drives.
- A is the classic trap. Chapter 3 tells you the occupancy group (for example, Group B). It doesn't tell you how many people to design the exits for.
- B controls allowable height and area.
- D covers accessible routes and elements, not occupant counts.
When a question says "occupant load," think Chapter 10. When it says "occupancy classification," think Chapter 3.
Source: 2024 IBC Code and Commentary, Volume 1: contents (PDF), Chapter 10; official sample (PDF), printed page 3-3, occupant-load discussion referencing Table 1004.5
B2-03 · Supplied data · Occupant-load arithmetic
For this arithmetic exercise only, a worksheet defines net area as a 1,200-square-foot total minus 240 square feet of listed excluded spaces. It supplies a factor of 15 net square feet per person. What occupant load does the worksheet produce?
- A. 15 people
- B. 64 people
- C. 80 people
- D. 96 people
Show answer and explanation for B2-03
Answer: B. Net area = 1,200 − 240 = 960 square feet. Then 960 ÷ 15 = 64 people.
- A confuses the factor with the result.
- C divides the total area (1,200 ÷ 15 = 80) and skips the exclusions.
- D divides by 10 instead of 15.
The habit to build: identify whether a factor is gross or net before you divide. This exercise's factor and exclusions are supplied assumptions, not a statement of the requirements for a particular occupancy. Real occupant-load factors and permitted exclusions come from the code for the actual use.
Source: original calculation from the supplied data
Answer: B. Net area = 1,200 − 240 = 960 square feet. Then 960 ÷ 15 = 64 people.
- A confuses the factor with the result.
- C divides the total area (1,200 ÷ 15 = 80) and skips the exclusions.
- D divides by 10 instead of 15.
The habit to build: identify whether a factor is gross or net before you divide. This exercise's factor and exclusions are supplied assumptions, not a statement of the requirements for a particular occupancy. Real occupant-load factors and permitted exclusions come from the code for the actual use.
Source: original calculation from the supplied data
B2-04 · 2024 IBC · Opening protectives
An opening in an exterior wall must be a protected opening. Where do you find the required fire protection rating for the fire door in that opening?
- A. Section 716 and its rating tables, in Chapter 7
- B. The door provisions in Chapter 10
- C. The safety-glazing provisions in Chapter 24
- D. Section 903, in Chapter 9
Show answer and explanation for B2-04
Answer: A. A protected opening needs a listed and labeled fire door, fire shutter or fire window that meets Section 716. Use the applicable door-assembly rating table and its notes. Table 716.1(1) addresses markings for fire-rated glazing; it is not the table of required fire-door ratings.
- B governs egress doors: width, swing and hardware. It doesn't set fire protection ratings.
- C is about impact safety (safety glazing), not fire ratings.
- D covers where sprinklers are required.
Source: ICC Building Safety Journal, Passive Fire Protection in the IBC, Part 3 (Samhar Hoz, May 21, 2024), opening-protective discussion; the published Table 716.1(1) image, showing the glazing-marking table
Answer: A. A protected opening needs a listed and labeled fire door, fire shutter or fire window that meets Section 716. Use the applicable door-assembly rating table and its notes. Table 716.1(1) addresses markings for fire-rated glazing; it is not the table of required fire-door ratings.
- B governs egress doors: width, swing and hardware. It doesn't set fire protection ratings.
- C is about impact safety (safety glazing), not fire ratings.
- D covers where sprinklers are required.
Source: ICC Building Safety Journal, Passive Fire Protection in the IBC, Part 3 (Samhar Hoz, May 21, 2024), opening-protective discussion; the published Table 716.1(1) image, showing the glazing-marking table
B2-05 · Navigation · Foam plastic insulation
You're checking foam plastic insulation. Which IBC chapter is dedicated to plastics, including foam plastic insulation?
- A. Chapter 8, Interior Finishes
- B. Chapter 13, Energy Efficiency
- C. Chapter 14, Exterior Walls
- D. Chapter 26, Plastic
Show answer and explanation for B2-05
Answer: D. Chapter 26 regulates plastics, including foam plastic insulation.
- A covers interior wall, ceiling and floor finishes. It doesn't house the main foam plastic insulation rules.
- B covers energy efficiency. It doesn't regulate foam plastic insulation as a plastic.
- C matters when the foam sits in an exterior wall assembly (see B2-06), but it isn't the plastics chapter.
Source: 2024 IBC Code and Commentary, Volume 2: contents (PDF), Chapter 26, Plastic; ICC B2 content outline (PDF), Plastic, Thermal and Sound-Insulating Materials
Answer: D. Chapter 26 regulates plastics, including foam plastic insulation.
- A covers interior wall, ceiling and floor finishes. It doesn't house the main foam plastic insulation rules.
- B covers energy efficiency. It doesn't regulate foam plastic insulation as a plastic.
- C matters when the foam sits in an exterior wall assembly (see B2-06), but it isn't the plastics chapter.
Source: 2024 IBC Code and Commentary, Volume 2: contents (PDF), Chapter 26, Plastic; ICC B2 content outline (PDF), Plastic, Thermal and Sound-Insulating Materials
Wall Construction and Coverings
B2-06 · Supplied criteria · Assembly vs. component evidence
For this evidence-reading exercise, the project requires proof for the complete exterior wall assembly, not just individual products. It accepts a passing test of the specific assembly, a matching third-party assembly listing, or an approved analysis based on a similar tested assembly. The only evidence submitted is a flame-test report for one insulation product. What is the best conclusion from that evidence alone?
- A. It establishes compliance for the complete wall assembly.
- B. It establishes compliance as long as the insulation thickness is unchanged.
- C. The exact wall must always undergo a new full-scale test, regardless of other accepted evidence.
- D. It doesn't establish assembly compliance; applicable assembly evidence must be checked.
Show answer and explanation for B2-06
Answer: D. The supplied criteria require evidence for the whole wall system. A single product report can't show that.
- A and B infer more than the report supports.
- C is too absolute. This exercise expressly accepts three kinds of evidence:
- testing the specific assembly
- a third-party listed assembly
- an approved analysis based on a similar tested assembly
This item only asks what the evidence proves under the supplied criteria. It doesn't determine whether a real wall needs NFPA 285 testing or which compliance method a building official will accept.
Source: all acceptance criteria and evidence are supplied in the question
Answer: D. The supplied criteria require evidence for the whole wall system. A single product report can't show that.
- A and B infer more than the report supports.
- C is too absolute. This exercise expressly accepts three kinds of evidence:
- testing the specific assembly
- a third-party listed assembly
- an approved analysis based on a similar tested assembly
This item only asks what the evidence proves under the supplied criteria. It doesn't determine whether a real wall needs NFPA 285 testing or which compliance method a building official will accept.
Source: all acceptance criteria and evidence are supplied in the question
B2-07 · 2024 IBC · Insulated metal panels
The 2024 IBC added a dedicated section for insulated metal panel (IMP) systems. In which chapter would you find it?
- A. Chapter 14, Exterior Walls
- B. Chapter 15, Roof Assemblies and Rooftop Structures
- C. Chapter 22, Steel
- D. Chapter 26, Plastic
Show answer and explanation for B2-07
Answer: A. IMP systems are now covered in Section 1409. Sections numbered 14xx are in Chapter 14.
- B is for roofs.
- C is tempting because the panels have metal faces, but Chapter 22 covers structural steel.
- D is tempting because many IMPs have foam cores. Chapter 26 addresses plastics, but the dedicated IMP section is in Chapter 14.
Source: ICC, Significant Changes to the IBC, 2024 edition: contents (PDF), printed page v, entry for Section 1409; 2024 IBC Code and Commentary, Volume 1: contents (PDF), Chapter 14
Answer: A. IMP systems are now covered in Section 1409. Sections numbered 14xx are in Chapter 14.
- B is for roofs.
- C is tempting because the panels have metal faces, but Chapter 22 covers structural steel.
- D is tempting because many IMPs have foam cores. Chapter 26 addresses plastics, but the dedicated IMP section is in Chapter 14.
Source: ICC, Significant Changes to the IBC, 2024 edition: contents (PDF), printed page v, entry for Section 1409; 2024 IBC Code and Commentary, Volume 1: contents (PDF), Chapter 14
B2-08 · Supplied data · Stud layout
A straight stud layout measures 24 feet between the centerlines of its first and last studs. Studs are laid out at 16 inches on center, including a stud at each of those endpoints. There are no openings, and you can ignore extra corner studs and plates. How many studs are in the layout?
- A. 18
- B. 19
- C. 20
- D. 24
Show answer and explanation for B2-08
Answer: B. 24 feet = 288 inches. Then 288 ÷ 16 = 18 spaces. A row with 18 spaces has 19 studs, because you add one for the starting end.
- A counts spaces instead of studs.
- C adds one too many.
- D assumes one stud per foot.
This is a layout count from the supplied numbers. It isn't a framing requirement. Stud size, spacing limits and connections come from the code and the approved plans.
Source: original calculation from the supplied data
Answer: B. 24 feet = 288 inches. Then 288 ÷ 16 = 18 spaces. A row with 18 spaces has 19 studs, because you add one for the starting end.
- A counts spaces instead of studs.
- C adds one too many.
- D assumes one stud per foot.
This is a layout count from the supplied numbers. It isn't a framing requirement. Stud size, spacing limits and connections come from the code and the approved plans.
Source: original calculation from the supplied data
Building Planning
B2-09 · 2024 IBC · Occupancy classification
A shop builds cabinets with ordinary sawing and sanding equipment. No hazardous materials exceed their applicable maximum allowable quantities. The process does not create combustible-dust concentrations and conditions that present a fire or explosion hazard, no other Group H condition applies, and there are no other uses. What occupancy group is it?
- A. Group B
- B. Group F-1
- C. Group H-2
- D. Group S-1
Show answer and explanation for B2-09
Answer: B. Typical cabinetmaking is listed in Section 306.2 under Factory Group F-1. The stem excludes the Group H conditions that could change that classification.
- A (Business) doesn't fit a production shop.
- C is the dust trap. Table 307.1(1), footnote o, can place combustible dust in Group H-2 when its concentration and conditions create a fire or explosion hazard. Being below other hazardous-material quantity limits does not, by itself, exclude that condition. This stem expressly excludes it.
- D (Storage) doesn't fit a shop that manufactures products.
Source: 2024 IBC, official Chapter 3 sample (PDF), Section 306.2 (printed pages 70–71) and Table 307.1(1), combustible-dust row and footnote o (printed pages 71–73)
Answer: B. Typical cabinetmaking is listed in Section 306.2 under Factory Group F-1. The stem excludes the Group H conditions that could change that classification.
- A (Business) doesn't fit a production shop.
- C is the dust trap. Table 307.1(1), footnote o, can place combustible dust in Group H-2 when its concentration and conditions create a fire or explosion hazard. Being below other hazardous-material quantity limits does not, by itself, exclude that condition. This stem expressly excludes it.
- D (Storage) doesn't fit a shop that manufactures products.
Source: 2024 IBC, official Chapter 3 sample (PDF), Section 306.2 (printed pages 70–71) and Table 307.1(1), combustible-dust row and footnote o (printed pages 71–73)
B2-10 · Navigation · Fire-resistance ratings by construction type
You need the required fire-resistance rating for the primary structural frame of a building, based on its type of construction. Which table do you open?
- A. Table 601, in Chapter 6
- B. The opening-protective rating tables in Section 716
- C. The occupant load table in Chapter 10
- D. The tables of prescriptive fire-resistive assemblies in Chapter 7
Show answer and explanation for B2-10
Answer: A. Table 601 sets fire-resistance ratings for building elements by type of construction. That includes the primary structural frame, bearing walls, and floor and roof construction.
- B rates doors, shutters and windows in protected openings.
- C is for occupant load.
- D is a good trap. Those Chapter 7 tables tell you which assemblies achieve a given rating. Table 601 tells you which rating you need in the first place.
Tab Table 601. It shows up across Building Planning.
Source: 2024 IBC Code and Commentary, Volume 1: official sample (PDF), printed page 3-1, discussion of Table 601 and construction types; ICC, Passive Fire Protection in the IBC, Part 3, discussion of Table 601 and fire-resistive assemblies
Answer: A. Table 601 sets fire-resistance ratings for building elements by type of construction. That includes the primary structural frame, bearing walls, and floor and roof construction.
- B rates doors, shutters and windows in protected openings.
- C is for occupant load.
- D is a good trap. Those Chapter 7 tables tell you which assemblies achieve a given rating. Table 601 tells you which rating you need in the first place.
Tab Table 601. It shows up across Building Planning.
Source: 2024 IBC Code and Commentary, Volume 1: official sample (PDF), printed page 3-1, discussion of Table 601 and construction types; ICC, Passive Fire Protection in the IBC, Part 3, discussion of Table 601 and fire-resistive assemblies
B2-11 · 2024 IBC · Fire walls vs. fire barriers
For the limited purpose of counting control areas under 2024 IBC Section 414.2.3, a designer wants two portions of a building treated as separate buildings. Which separation does that section recognize for this purpose?
- A. A smoke partition
- B. Any fire barrier that creates separate fire areas
- C. A fire wall complying with Section 706
- D. An ordinary partition with separate room numbers
Show answer and explanation for B2-11
Answer: C. Section 414.2.3 says that, when counting control areas "within a building," each portion must be separated by one or more fire walls complying with Section 706 to be considered a separate building.
- B is the trap. Fire barriers can create separate fire areas, and appropriately rated fire barriers can separate control areas. But they don't create separate buildings for this purpose.
- A and D don't come close.
This answer doesn't settle hazardous-material quantities or a building's full design.
Source: ICC Code Corner: 2024 IBC Section 414.2.3, Number of Control Areas (Beth Tubbs, January 17, 2025)
Answer: C. Section 414.2.3 says that, when counting control areas "within a building," each portion must be separated by one or more fire walls complying with Section 706 to be considered a separate building.
- B is the trap. Fire barriers can create separate fire areas, and appropriately rated fire barriers can separate control areas. But they don't create separate buildings for this purpose.
- A and D don't come close.
This answer doesn't settle hazardous-material quantities or a building's full design.
Source: ICC Code Corner: 2024 IBC Section 414.2.3, Number of Control Areas (Beth Tubbs, January 17, 2025)
Footings and Foundations
B2-12 · Supplied data · Elevations to depth
At the same location, a drawing shows finished grade at elevation 100.25 feet and the bottom of footing at 96.75 feet. How far below finished grade is the bottom of the footing?
- A. 36 inches
- B. 40 inches
- C. 42 inches
- D. 48 inches
Show answer and explanation for B2-12
Answer: C. 100.25 − 96.75 = 3.5 feet. Then 3.5 × 12 = 42 inches.
- A is 3 feet.
- D is 4 feet.
- B doesn't match the difference.
Elevations are heights, not depths. Subtract first, then convert. Whether 42 inches is deep enough depends on the code, the soils report and local frost depth, which this exercise doesn't supply.
Source: original calculation from the supplied data
Answer: C. 100.25 − 96.75 = 3.5 feet. Then 3.5 × 12 = 42 inches.
- A is 3 feet.
- D is 4 feet.
- B doesn't match the difference.
Elevations are heights, not depths. Subtract first, then convert. Whether 42 inches is deep enough depends on the code, the soils report and local frost depth, which this exercise doesn't supply.
Source: original calculation from the supplied data
Floor Construction
B2-13 · Supplied data · Slab volume
A rectangular slab is 27 feet long, 18 feet wide and 6 inches thick throughout. Ignore waste, openings and thickened edges. What is its volume in cubic yards?
- A. 9 cubic yards
- B. 18 cubic yards
- C. 81 cubic yards
- D. 243 cubic yards
Show answer and explanation for B2-13
Answer: A. Convert the thickness first: 6 inches = 0.5 feet. Then 27 × 18 × 0.5 = 243 cubic feet, and 243 ÷ 27 = 9 cubic yards.
- B treats the slab as 1 foot thick.
- C divides by 3 (feet per yard) instead of 27 (cubic feet per cubic yard).
- D is the cubic-foot answer with the wrong unit.
This is geometric volume only. It isn't an order quantity or a slab requirement.
Source: original calculation from the supplied data
Answer: A. Convert the thickness first: 6 inches = 0.5 feet. Then 27 × 18 × 0.5 = 243 cubic feet, and 243 ÷ 27 = 9 cubic yards.
- B treats the slab as 1 foot thick.
- C divides by 3 (feet per yard) instead of 27 (cubic feet per cubic yard).
- D is the cubic-foot answer with the wrong unit.
This is geometric volume only. It isn't an order quantity or a slab requirement.
Source: original calculation from the supplied data
Roof/Ceiling Construction
B2-14 · Supplied data · Roof slope
A roof rises 5 feet over a horizontal run of 20 feet. What is the slope in inches of rise per 12 inches of run?
- A. 1:12
- B. 3:12
- C. 4:12
- D. 5:12
Show answer and explanation for B2-14
Answer: B. 5 ÷ 20 = 0.25. Then 0.25 × 12 = 3, so the slope is 3:12.
- D carries the 5-foot rise into the notation without scaling the run.
- A and C are different ratios.
Many roof-covering rules are written as a minimum slope, so getting the ratio right comes first. This exercise doesn't state any roofing minimum.
Source: original calculation from the supplied data
Answer: B. 5 ÷ 20 = 0.25. Then 0.25 × 12 = 3, so the slope is 3:12.
- D carries the 5-foot rise into the notation without scaling the run.
- A and C are different ratios.
Many roof-covering rules are written as a minimum slope, so getting the ratio right comes first. This exercise doesn't state any roofing minimum.
Source: original calculation from the supplied data
General Administration
B2-15 · Supplied data · Reading the documents you're given
For this exercise, the project documents say to use a general attachment-spacing note only where no specific detail is provided. The general note says 12 inches maximum. The wall schedule points to Detail 6/A503, which says 8 inches maximum. The measured spacing is 10 inches. What follows from these instructions?
- A. The spacing meets the criterion because it's under 12 inches.
- B. The spacing doesn't meet the specific detail's 8-inch maximum.
- C. The building code always requires 8-inch spacing for this attachment.
- D. Without a code section, the measurement can't be compared with the detail.
Show answer and explanation for B2-15
Answer: B. The documents say the general note applies only when there's no specific detail. Here there is a detail, and 10 inches exceeds its 8-inch maximum.
- A ignores the documents' own instruction.
- C invents a universal code value.
- D confuses checking a stated drawing criterion with finding a code requirement.
The point is to read which note governs before you measure against it. This exercise shows a discrepancy; it doesn't decide the field outcome.
Source: all facts are supplied in the question
Answer: B. The documents say the general note applies only when there's no specific detail. Here there is a detail, and 10 inches exceeds its 8-inch maximum.
- A ignores the documents' own instruction.
- C invents a universal code value.
- D confuses checking a stated drawing criterion with finding a code requirement.
The point is to read which note governs before you measure against it. This exercise shows a discrepancy; it doesn't decide the field outcome.
Source: all facts are supplied in the question
B2-16 · 2024 IBC · Building official's authority
Under the 2024 IBC, where do you find the building official's duties and powers?
- A. Chapter 1, Section 104
- B. Chapter 17, Special Inspections and Tests
- C. Chapter 35, Referenced Standards
- D. Chapter 2, Definitions
Show answer and explanation for B2-16
Answer: A. The 2024 IBC significantly revised Section 104, the building official's duties-and-powers section. Start with the administrative provision, not a technical inspection chapter.
- B covers special inspections and tests, not the official's general authority.
- C lists the standards the code references.
- D defines terms.
Administrative questions usually start in Chapter 1.
Source: ICC, Significant Changes to the IBC, 2024 edition: contents (PDF), printed page iii, Section 104, Building Official Duties and Powers; 2024 IBC Code and Commentary, Volume 1: contents (PDF), Chapter 1
Answer: A. The 2024 IBC significantly revised Section 104, the building official's duties-and-powers section. Start with the administrative provision, not a technical inspection chapter.
- B covers special inspections and tests, not the official's general authority.
- C lists the standards the code references.
- D defines terms.
Administrative questions usually start in Chapter 1.
Source: ICC, Significant Changes to the IBC, 2024 edition: contents (PDF), printed page iii, Section 104, Building Official Duties and Powers; 2024 IBC Code and Commentary, Volume 1: contents (PDF), Chapter 1
Answer key and how to score yourself
| Question | Answer | Question | Answer |
|---|---|---|---|
| B2-01 | C | B2-09 | B |
| B2-02 | C | B2-10 | A |
| B2-03 | B | B2-11 | C |
| B2-04 | A | B2-12 | C |
| B2-05 | D | B2-13 | A |
| B2-06 | D | B2-14 | B |
| B2-07 | A | B2-15 | B |
| B2-08 | B | B2-16 | A |
Count one point for each correct answer; an incorrect or unanswered question earns zero. Divide your points by 16 and multiply by 100. Separately mark any correct answer you guessed or could not explain: record the code location for code questions and the calculation or stated criterion for supplied-data or supplied-criteria questions. Your percentage tells you how you did on these 16 questions. It isn't an ICC score or a prediction of passing. This set is a starter, not a full-length exam, and it covers only part of each exam area.
Keep your IBC open. Each code answer shows where the rule lives, so you practice the lookup, not just the fact. If you're taking the 2021 exam, don't use these 2024 items as a 2021 answer key: check both the requirements and the section numbers in your own edition.
B2 format and the published topic outline
80 multiple-choice questions · 3 hr 30 min · Open book · 2021 or 2024 edition offered · Passing standard: scaled score of 75
Format: ICC B2 exam page and ICC B2 outline (PDF). Editions: ICC national exam list, updated January 12, 2026 (PDF). Scoring: ICC's explanation of 75.
ICC's publicly posted, undated B2 content outline splits the exam into seven areas. The weights below describe that document; use the selected-year catalog outline for your exam. The question counts are our arithmetic (weight × 80). ICC publishes percentages, not counts, so treat them as rough planning numbers.
| Exam area in the posted ICC outline | Published weight | Roughly how many of 80 | Where to start in the 2024 IBC |
|---|---|---|---|
| Public Safety and Special Construction | 31% | about 25 | Ch. 10 Means of Egress (10% on its own), Ch. 9 fire protection systems, Ch. 8 interior finishes, Ch. 24 glazing, Ch. 7 opening protectives and penetrations, Ch. 26 plastics |
| Wall Construction and Coverings | 21% | about 17 | Ch. 23 Wood, Ch. 22 Steel, Ch. 21 Masonry, Ch. 19 Concrete plus your concrete reference, Ch. 14 Exterior Walls |
| Building Planning | 20% | about 16 | Ch. 3 Occupancy, Ch. 5 Heights and Areas, Ch. 6 Types of Construction, Ch. 7 fire and smoke protection, Ch. 11 Accessibility, Ch. 12 Interior Environment |
| Footings and Foundations | 8% | about 6 | Ch. 18 Soils and Foundations, concrete reference |
| Floor Construction | 8% | about 6 | Ch. 23 wood floors, Ch. 19 and concrete reference for slabs |
| Roof/Ceiling Construction | 6% | about 5 | Ch. 15 Roof Assemblies, Ch. 23 framing, Ch. 12 attics |
| General Administration | 6% | about 5 | Ch. 1 Scope and Administration, Ch. 17 Special Inspections, plan reading |
In that outline, the top three areas total 72%. Means of egress alone is weighted more than all of roof/ceiling construction. Use those priorities as a starting point, then adjust for your selected-year outline and the topics you miss.
These weights come from ICC's B2 content outline (PDF). That document isn't dated, so compare it with the Outline tab for your code year in the ICC Exam Catalog. Your catalog entry is the version that counts.
The chapter map is a study-navigation aid, not an official assignment of individual exam questions to chapters. Chapter locations are supported by the 2024 IBC Code and Commentary contents, Volume 1 (PDF) and Volume 2 (PDF).
How to work a code-lookup question
Open book doesn't mean slow book. You have 210 minutes for 80 questions, which averages about 2 minutes 38 seconds per question (210 ÷ 80 = 2.625 minutes). Use two minutes as a practice target for straightforward lookups, not as an ICC time limit for each question. Some lookups take longer, so speed on the easy ones matters. (ICC B2 exam format)
Here's the routine, using B2-01 as the example:
- Name the question type. Is it asking for a requirement, a classification, a number, or what a document proves? B2-01 asks how far a requirement reaches.
- Jump to the chapter. IBC section numbers start with their chapter number: 903 is in Chapter 9, 1004 is in Chapter 10, and 1409 is in Chapter 14. Sprinklers mean Chapter 9.
- Read the scope and the conditions. In 903.2.4.1, the triggers are woodworking over 2,500 square feet and equipment that generates combustible dust. The protected area is the fire area.
- Check exceptions and the neighboring section. The general F-1 trigger in 903.2.4 is the distractor's source.
- During study, write down the location in your error log. A remembered letter doesn't transfer to a new question. A section number and a condition do. Do not write in your references during the exam; PRONTO supplies an on-screen notepad. (ICC exam rules)
Your 6-week B2 study plan
Assumption: four 60-minute sessions a week, 24 hours total. That's a starting framework, not a promise of readiness. Stretch the plan if you're new to commercial construction or a week's lookups still feel slow.
Use this rhythm except for the timed block in Week 6:
- 10 minutes: recall what you covered last time, from memory
- 35 minutes: lookups in your book
- 10 minutes: practice or checking
- 5 minutes: update your error log
| Week | Session 1 | Session 2 | Session 3 | Session 4 |
|---|---|---|---|---|
| 1 · Set up | Confirm your code year in the Exam Catalog. Save the Outline and References for it. | Tab your IBC chapters (tab plan below). Read the table of contents twice. | Work all 16 practice questions untimed. Note any lookup over 3 minutes. | Review misses. Practice the numbering trick: name the chapter for 20 random section numbers. |
| 2 · Building Planning | Ch. 3 occupancy groups. Classify 10 uses you know. | Ch. 6 and Table 601. Read every row and footnote once. | Ch. 5 height and area tables. Learn how the tables are laid out. | Ch. 7 fire walls, barriers, partitions. Redo B2-10 and B2-11 from the book. |
| 3 · Means of egress | Ch. 10 occupant load. Redo B2-02 and B2-03. | Ch. 10 number of exits, travel distance, corridors | Ch. 10 stairs, guards, handrails, doors | Mixed egress lookups, timed at 2½ minutes each |
| 4 · Public Safety, continued | Ch. 9 sprinkler and alarm triggers. Redo B2-01. | Ch. 8 interior finishes and Ch. 26 plastics | Ch. 24 safety glazing and Ch. 7 opening protectives, penetrations, fireblocking | Ch. 11 accessibility and Ch. 12 interior environment |
| 5 · Structure | Ch. 18 footings and foundations. Redo B2-12. | Concrete reference: practice finding topics with its index. Redo B2-13. | Ch. 21 masonry, Ch. 22 steel, Ch. 23 wood. Redo B2-08. | Ch. 14 exterior walls, Ch. 15 roofs. Redo B2-06, B2-07 and B2-14. |
| 6 · Exam conditions | Ch. 1 administration and Ch. 17 special inspections. Redo B2-15 and B2-16. | Timed mixed block: all 16 questions, up to 2½ minutes each (40 minutes), then 20 minutes to review explanations and update your log | Repair the topic with the most error-log entries | Check your exam rules, ID and setup (see below). Run the PRONTO system check if testing remotely. |
Adapting it:
- Already inspect commercial work? Compress to three weeks by doing two rows' worth of sessions each week, but don't skip Week 1.
- New to the IBC? Spend two weeks each on Weeks 3 and 5.
- Retaking? Your score report shows how you did in each content area. Rebuild Weeks 2–5 around the weakest areas before you rebook. ICC itself advises against same-day retakes without that review. (ICC: After the Exam)
Keep an error log
Sort misses into four useful categories: the wrong chapter, a missed condition, misread documents, or units. Log each miss so you fix the cause, not just the letter.
| Question or task | Edition or data basis | Where the answer lives | What went wrong | Fix | Review on |
|---|---|---|---|---|---|
| B2-13 | Supplied data | 27 × 18 × 0.5 ÷ 27 = 9 yd³ | Used 6 inches as 6 feet | Convert every dimension to feet first | Next session |
Books and tabs: what you can bring
Match the edition first
ICC currently offers the B2 in 2021 and 2024 editions (ICC national exam list, updated January 12, 2026). Choose the code year when you buy the exam, and bring the IBC edition that matches it. ICC's purchase page tells candidates to confirm the code year before buying, because exam purchases are final.
If your employer or jurisdiction names an edition, use that one. ICC certifies inspectors; it doesn't license them, so check any job or local requirement separately.
Confirm the permitted references for your entry
Open the ICC Exam Catalog, choose the national B2 — Commercial Building Inspector entry and your code year, then save its Outline and References. Match each title and edition to that entry before you prepare your books. Use its concrete reference for the concrete topics in this plan.
A training-course materials list is not the exam's approved-reference list. Don't infer that the IBC alone is sufficient, that you must bring every book named by a course, or that two references are interchangeable without the selected exam entry saying so. ICC's administrative rules direct candidates to the catalog for approved references.
What ICC's rules allow
For open-book exams, ICC's administrative rules allow:
- Print references that are bound (original binding, three-ring binder or stapled). Photocopies of copyrighted material aren't allowed.
- Ink notes and highlighting in your references.
- Permanently attached tabs, meaning tabs that can't come off without destroying the page.
- A magnifying glass, an architect's scale or ruler, and a foreign-language translation dictionary.
- A basic four-function calculator. It must be battery-operated and non-programmable, can't store examination information or print, and is limited to adding, subtracting, multiplying, dividing, square roots and percentages. Construction calculators that store formulas aren't allowed.
You can't use writing instruments, paper, watches or extra electronic devices during the exam unless an applicable accommodation has been approved. Remote (PRONTO) candidates use an on-screen notepad. Have a phone available for remote check-in; that is not permission to use it while answering questions. Follow the proctor's check-in instructions. (ICC: During the Exam)
Don't assume you can use a digital code book. The Exam Catalog flags exams that offer ICC's digital-reference feature, so check your entry.
A tab plan for these study topics
| Tab first | Then | Also flag with ink notes |
|---|---|---|
| Ch. 10, 7, 9, 8, 24, 3, 5, 6, 23, 21, 18, 19, 14, 26 | Ch. 1, 11, 12, 15, 17, 22, 25, 31, 33 | Table 601, the Ch. 5 height and area tables, the Ch. 10 occupant load table, the Section 716 rating tables, and the index of your concrete reference |
Practice with the tabbed book from Week 1. A tab you've never used under time pressure won't help on exam day.
How B2 scoring works
You pass with a scaled score of 75. That isn't 75% correct, and it isn't "60 out of 80." ICC sets the passing standard with subject-matter experts and then scales each exam form for difficulty. The number of correct answers needed can be above or below 75% depending on the form. ICC's own illustrations use 70% correct on one form and 85% on another as examples that could both equal a scaled 75; these are not published B2 raw-score cutoffs. (ICC: Understanding the 75 score; ICC: How exam scores work)
What that means for you:
- Answer everything. There's no penalty for a wrong answer, so never leave one blank.
- Bookmark and come back. The exam platform lets you flag a question and return to it before you submit.
- Read for the traps. Watch for "except," "not," "minimum" and "maximum."
Results are available immediately. If you pass, you see "PASS" with no number. If you don't, your report shows your performance by content area. (ICC: After the Exam; ICC: During the Exam)
Booking, exam day and retakes
- Buy through your myICC account. Exam purchases are final and valid for 365 days. Your account name must exactly match your government-issued photo ID. The ID must be original, unexpired and signed; temporary licenses are not accepted. (ICC B2 exam page; ICC identity rules)
- Check the delivery option in your selected B2 entry. ICC describes these PRONTO certification-exam options:
- remotely, any time, with a live online proctor
- in person, at one of more than 550 Meazure Learning test centers
Either way, it's one session. Remote testing needs a webcam, a microphone, a hard desk or table, and a single monitor. Chromebooks and tablets aren't supported. Run ICC's system check before you book. (ICC PRONTO)
- Price: the current fee appears on the B2 exam page once you choose your code year and format. ICC members get discounted exam pricing. (ICC Exam Catalog)
- Retakes: you get six attempts within a six-month period, and you pay the fee each time. After six attempts, you wait six months from your first attempt before registering again. (ICC Admin/Rules)
- Accommodations: for PRONTO exams, ICC's rules direct candidates to submit its ADA accommodation request form. Start from ICC's candidate requests page. The PRONTO accommodation form (PDF) says not to attempt testing until you receive official confirmation from ICC.
Common B2 questions
Is the B2 a license? No. It's an ICC certification, not a license to practice. Check any separate credential, appointment or licensing requirement with the employer or authority where you'll work. (ICC: After the Exam)
What does B2 lead to? The B2 counts toward several ICC combination designations (ICC combination designations):
| Designation | What you need |
|---|---|
| B5 Building Inspector | B1 + B2 |
| C5 Commercial Combination Inspector | B2, E2, M2 and P2 |
| C8 Combination Inspector | B1, B2, E1, E2, M1, M2, P1 and P2 |
| B8 Building Code Specialist | B1, B2, B3 and the CS module; ICC also allows CBO in place of CS |
The constituent certifications must be current, and ICC's applicable combination-designation requirements still apply.
Sources and last verified
Last verified October 5, 2026: the cited B2 format and edition listings, the posted undated outline, ICC's general scoring and exam-administration rules, combination-designation requirements, and the code excerpts and publications linked with individual questions. The permitted-reference list and digital-reference availability are specific to the selected catalog entry. The study plan and practice percentage are editorial study aids, not ICC requirements or pass predictions.
- ICC exam information: B2 content outline (PDF) · B2 exam page · National exams list (January 12, 2026; PDF) · Exam Catalog
- ICC rules: Admin/Rules · PRONTO · During the Exam · After the Exam · Candidate requests and accommodations · Combination designations
- ICC scoring: Understanding the 75 score · How exam scores work
This resource was developed with AI assistance. Source and calculation checks are not a qualified professional review. See our methodology.
Castleport Test Prep is an independent exam prep publisher, not affiliated with, endorsed by, or approved by the International Code Council. Exam and credential names identify their subjects; trademarks belong to their respective owners. The practice questions on this page are original and are not official ICC exam questions. This guide doesn't guarantee a passing score, certification, licensure or employment, and it isn't a code determination for any real project. Read more about our independence.
By Castleport Test Prep Editorial Team