International Residential Code (IRC) Complete PDF Study
Guide & Code Review Exam Prep 2026
Master the International Code Council (ICC) regulations for residential construction with
this comprehensive IRC study guide. It covers critical code chapters including
foundation metrics, structural framing, plumbing systems, and electrical safety for one-
and two-family dwellings. Download this study bundle to ace your building inspector
certification exam or confidently verify compliance on your next residential design
project.
Question 1:
According to Chapter 1 of the IRC, the provisions of this code apply strictly to detached
one- and two-family dwellings and townhouses that are limited to a maximum height of
how many stories above the grade plane?
A) One story
B) Two stories
C) Three stories
D) Four stories
Answer: C) Three stories
Rationale: IRC Section R101.2 limits the scope of the residential code to detached one-
and two-family dwellings and townhouses not more than three stories above grade
plane in height, with a separate means of egress.
Question 2:
What is the minimum uniformly distributed live load that a residential sleeping room
(bedroom) floor must be structurally designed to safely support?
A) 10 pounds per square foot (psf)
B) 30 pounds per square foot (psf)
C) 40 pounds per square foot (psf)
D) 50 pounds per square foot (psf)
Answer: B) 30 pounds per square foot (psf)
,Rationale: IRC Table R301.5 establishes that habitable rooms other than sleeping areas
must design for 40 psf, but specifically permits a reduced minimum live load of 30 psf
for sleeping rooms.
Question 3:
Except for kitchens, all habitable rooms within a residential dwelling unit must be
provided with aggregate glazing areas of not less than what percentage of the total floor
area of the room?
A) 4 percent
B) 8 percent
C) 10 percent
D) 12 percent
Answer: B) 8 percent
Rationale: IRC Section R303.1 dictates that natural light requirements must be met by
providing aggregate glazing areas equal to a minimum of 8 percent of the total room
floor area.
Question 4:
What is the absolute minimum net clear floor area required for at least one habitable
room within every newly constructed residential dwelling unit?
A) 70 square feet
B) 120 square feet
C) 150 square feet
D) 200 square feet
Answer: B) 120 square feet
Rationale: IRC Section R304.1 requires that every dwelling unit contain at least one
habitable room that has a minimum net clear floor area of not less than 120 square feet.
Question 5:
What is the minimum required ceiling height for all habitable rooms, hallways, and
basements containing habitable spaces?
A) 6 feet 6 inches
B) 7 feet 0 inches
,C) 7 feet 6 inches
D) 8 feet 0 inches
Answer: B) 7 feet 0 inches
Rationale: IRC Section R305.1 mandates that habitable space, hallways, and
basements must have a ceiling height of not less than 7 feet, with specific exceptions
permitted for beams, pipes, and sloped ceilings.
Question 6:
A door separating an attached residential garage from the main residential dwelling unit
must meet which of the following safety criteria?
A) 1/2-inch thick hollow-core wood door
B) 1-3/8 inches thick solid wood or honeycomb-core steel door
C) 2-hour fire-resistance rated assembly
D) 20-minute rated aluminum door
Answer: B) 1-3/8 inches thick solid wood or honeycomb-core steel door
Rationale: IRC Section R302.5.1 addresses opening protection from a garage, requiring
a minimum 1-3/8 inch solid wood door, solid or honeycomb-core steel door, or a 20-
minute fire-rated door.
Question 7:
All emergency escape and rescue openings (egress windows) required in sleeping
rooms must have a maximum sill height of how many inches measured above the
finished floor?
A) 36 inches
B) 42 inches
C) 44 inches
D) 48 inches
Answer: C) 44 inches
Rationale: IRC Section R310.2.1 specifies that emergency escape and rescue openings
must have a bottom sill height of not more than 44 inches measured from the finished
floor level.
, Question 8:
When an emergency escape and rescue window opening is located below the adjacent
ground elevation, it must be provided with a window well that has a minimum horizontal
area of how many square feet?
A) 5.0 square feet
B) 5.7 square feet
C) 9.0 square feet
D) 12.0 square feet
Answer: C) 9.0 square feet
Rationale: IRC Section R310.2.3 mandates that a window well serving an egress
opening must have a horizontal area of not less than 9 square feet, with a minimum
horizontal projection and width of 36 inches.
Question 9:
What is the minimum required width of a main exit door (egress door) providing a
continuous path of travel from the interior of a dwelling to the outside?
A) 28 inches
B) 32 inches
C) 36 inches
D) 38 inches
Answer: C) 36 inches
Rationale: IRC Section R311.2 mandates that at least one egress door must be a side-
hinged door with a minimum nominal width of 36 inches, providing a net clear opening
width of at least 32 inches.
Question 10:
What is the maximum permissible riser height for a set of residential stairs designed in
compliance with the IRC?
A) 7 inches
B) 7-3/4 inches
C) 8 inches
D) 8-1/4 inches
Answer: B) 7-3/4 inches
Rationale: IRC Section R311.7.5.1 dictates that the maximum riser height within
residential stairways shall not exceed 7-3/4 inches.
Guide & Code Review Exam Prep 2026
Master the International Code Council (ICC) regulations for residential construction with
this comprehensive IRC study guide. It covers critical code chapters including
foundation metrics, structural framing, plumbing systems, and electrical safety for one-
and two-family dwellings. Download this study bundle to ace your building inspector
certification exam or confidently verify compliance on your next residential design
project.
Question 1:
According to Chapter 1 of the IRC, the provisions of this code apply strictly to detached
one- and two-family dwellings and townhouses that are limited to a maximum height of
how many stories above the grade plane?
A) One story
B) Two stories
C) Three stories
D) Four stories
Answer: C) Three stories
Rationale: IRC Section R101.2 limits the scope of the residential code to detached one-
and two-family dwellings and townhouses not more than three stories above grade
plane in height, with a separate means of egress.
Question 2:
What is the minimum uniformly distributed live load that a residential sleeping room
(bedroom) floor must be structurally designed to safely support?
A) 10 pounds per square foot (psf)
B) 30 pounds per square foot (psf)
C) 40 pounds per square foot (psf)
D) 50 pounds per square foot (psf)
Answer: B) 30 pounds per square foot (psf)
,Rationale: IRC Table R301.5 establishes that habitable rooms other than sleeping areas
must design for 40 psf, but specifically permits a reduced minimum live load of 30 psf
for sleeping rooms.
Question 3:
Except for kitchens, all habitable rooms within a residential dwelling unit must be
provided with aggregate glazing areas of not less than what percentage of the total floor
area of the room?
A) 4 percent
B) 8 percent
C) 10 percent
D) 12 percent
Answer: B) 8 percent
Rationale: IRC Section R303.1 dictates that natural light requirements must be met by
providing aggregate glazing areas equal to a minimum of 8 percent of the total room
floor area.
Question 4:
What is the absolute minimum net clear floor area required for at least one habitable
room within every newly constructed residential dwelling unit?
A) 70 square feet
B) 120 square feet
C) 150 square feet
D) 200 square feet
Answer: B) 120 square feet
Rationale: IRC Section R304.1 requires that every dwelling unit contain at least one
habitable room that has a minimum net clear floor area of not less than 120 square feet.
Question 5:
What is the minimum required ceiling height for all habitable rooms, hallways, and
basements containing habitable spaces?
A) 6 feet 6 inches
B) 7 feet 0 inches
,C) 7 feet 6 inches
D) 8 feet 0 inches
Answer: B) 7 feet 0 inches
Rationale: IRC Section R305.1 mandates that habitable space, hallways, and
basements must have a ceiling height of not less than 7 feet, with specific exceptions
permitted for beams, pipes, and sloped ceilings.
Question 6:
A door separating an attached residential garage from the main residential dwelling unit
must meet which of the following safety criteria?
A) 1/2-inch thick hollow-core wood door
B) 1-3/8 inches thick solid wood or honeycomb-core steel door
C) 2-hour fire-resistance rated assembly
D) 20-minute rated aluminum door
Answer: B) 1-3/8 inches thick solid wood or honeycomb-core steel door
Rationale: IRC Section R302.5.1 addresses opening protection from a garage, requiring
a minimum 1-3/8 inch solid wood door, solid or honeycomb-core steel door, or a 20-
minute fire-rated door.
Question 7:
All emergency escape and rescue openings (egress windows) required in sleeping
rooms must have a maximum sill height of how many inches measured above the
finished floor?
A) 36 inches
B) 42 inches
C) 44 inches
D) 48 inches
Answer: C) 44 inches
Rationale: IRC Section R310.2.1 specifies that emergency escape and rescue openings
must have a bottom sill height of not more than 44 inches measured from the finished
floor level.
, Question 8:
When an emergency escape and rescue window opening is located below the adjacent
ground elevation, it must be provided with a window well that has a minimum horizontal
area of how many square feet?
A) 5.0 square feet
B) 5.7 square feet
C) 9.0 square feet
D) 12.0 square feet
Answer: C) 9.0 square feet
Rationale: IRC Section R310.2.3 mandates that a window well serving an egress
opening must have a horizontal area of not less than 9 square feet, with a minimum
horizontal projection and width of 36 inches.
Question 9:
What is the minimum required width of a main exit door (egress door) providing a
continuous path of travel from the interior of a dwelling to the outside?
A) 28 inches
B) 32 inches
C) 36 inches
D) 38 inches
Answer: C) 36 inches
Rationale: IRC Section R311.2 mandates that at least one egress door must be a side-
hinged door with a minimum nominal width of 36 inches, providing a net clear opening
width of at least 32 inches.
Question 10:
What is the maximum permissible riser height for a set of residential stairs designed in
compliance with the IRC?
A) 7 inches
B) 7-3/4 inches
C) 8 inches
D) 8-1/4 inches
Answer: B) 7-3/4 inches
Rationale: IRC Section R311.7.5.1 dictates that the maximum riser height within
residential stairways shall not exceed 7-3/4 inches.
