California Home Inspector Exam 2026 – 190 Practice Questions with
Answers & Detailed Rationales, Structural Systems, Roofing,
Electrical, Plumbing, HVAC, Interiors, Safety & California Inspection
Standards
Question 1
A home inspector is examining a 1970s-era home and observes a light-colored, powdery
substance on the exterior brick veneer. The substance appears crystalline and is located near
the ground level. What is the most likely identification and cause of this condition?
A. Efflorescence, caused by moisture wicking through the masonry and evaporating.
B. Mold growth, caused by excessive humidity and poor ventilation.
C. Salt spray residue, caused by proximity to the ocean.
D. Paint failure, caused by improper surface preparation.
Correct Answer: A
Explanation: Efflorescence is a white, powdery deposit of water-soluble salts left on the
surface of masonry after water evaporates. It indicates a moisture issue.
Question 2
During an inspection of a residential property, the inspector notices a horizontal crack in the
foundation wall that is wider at the top than at the bottom. The crack is located on a
foundation wall that is backfilled on the exterior. What is the most probable cause of this
type of crack?
A. A settling of the footing due to soil consolidation.
B. Hydrostatic pressure from saturated soil pushing against the foundation wall.
,C. A shrinkage crack from the concrete curing process.
D. An expansion crack from thermal movement of the foundation.
Correct Answer: B
Explanation: A horizontal crack that is wider at the top indicates the wall is bowing inward
due to lateral soil pressure, a common issue with backfilled foundation walls.
Question 3
An inspector is testing a representative number of electrical receptacles in a home. Using a
three-light receptacle tester, the inspector observes that the center light (amber) is
illuminated, but the two outer lights are not. What is the most significant issue indicated by
this reading?
A. The receptacle is correctly wired and grounded.
B. The receptacle has an open ground.
C. The receptacle has an open neutral.
D. The receptacle has reverse polarity.
Correct Answer: B
Explanation: On a standard three-light tester, the center light indicates the hot and neutral
are correct. The outer lights are for the ground and the hot-ground circuit. No outer light
indicates an open ground.
Question 4
A gas-fired forced-air furnace is inspected. The inspector observes a yellow, lazy flame
instead of a crisp blue flame. What is the most likely cause and the associated safety
concern?
,A. A dirty flame sensor; this causes the furnace to cycle frequently.
B. A cracked heat exchanger; this allows exhaust gases into the supply air.
C. Incomplete combustion due to a lack of primary air; this produces carbon monoxide.
D. Excessive gas pressure; this can cause the flame to lift off the burners.
Correct Answer: C
Explanation: A yellow flame indicates incomplete combustion, often from insufficient
primary air. This produces carbon monoxide, a significant health hazard.
Question 5
An inspector observes a significant amount of water staining on the ceiling below a second-
floor bathroom. The stain is circular and has a dark, discolored center. The inspector should
MOST likely advise the client to:
A. Paint over the stain with a stain-blocking primer.
B. Consult a licensed plumber to identify and repair the source of the leak.
C. Replace the entire ceiling section immediately.
D. Simply monitor the stain to see if it grows larger.
Correct Answer: B
Explanation: The inspector's role is to identify the symptom (stain) and recommend the
appropriate specialist. The source of the leak must be found and repaired by a licensed
plumber.
Question 6
When inspecting a home's grounding system, the inspector finds a copper wire that runs
from the main electrical panel to a metal water pipe. What is the primary function of this
grounding electrode conductor?
, A. To provide a path for electrical current to return to the source during normal operation.
B. To provide a low-resistance path for fault current to travel to the earth, tripping the
breaker.
C. To bond the water pipe to prevent it from becoming energized.
D. To act as a backup neutral connection for the utility company.
Correct Answer: B
Explanation: The grounding electrode conductor connects the electrical system to the earth,
providing a path for fault current to dissipate and ensuring overcurrent devices trip.
Question 7
A roof inspection reveals that the asphalt shingles are curling and buckling. There is also a
significant amount of moss growth on the north-facing slope. Which of the following is the
MOST likely root cause of this condition?
A. Mechanical damage from foot traffic during installation.
B. Inadequate attic ventilation and/or a lack of a proper underlayment.
C. Improper nailing of the shingles during installation.
D. Chemical reaction with the roofing felt.
Correct Answer: B
Explanation: Curling and buckling shingles are often caused by excessive heat and moisture
from poor attic ventilation. Moss growth indicates a moist environment, supporting this
conclusion.
Question 8
Answers & Detailed Rationales, Structural Systems, Roofing,
Electrical, Plumbing, HVAC, Interiors, Safety & California Inspection
Standards
Question 1
A home inspector is examining a 1970s-era home and observes a light-colored, powdery
substance on the exterior brick veneer. The substance appears crystalline and is located near
the ground level. What is the most likely identification and cause of this condition?
A. Efflorescence, caused by moisture wicking through the masonry and evaporating.
B. Mold growth, caused by excessive humidity and poor ventilation.
C. Salt spray residue, caused by proximity to the ocean.
D. Paint failure, caused by improper surface preparation.
Correct Answer: A
Explanation: Efflorescence is a white, powdery deposit of water-soluble salts left on the
surface of masonry after water evaporates. It indicates a moisture issue.
Question 2
During an inspection of a residential property, the inspector notices a horizontal crack in the
foundation wall that is wider at the top than at the bottom. The crack is located on a
foundation wall that is backfilled on the exterior. What is the most probable cause of this
type of crack?
A. A settling of the footing due to soil consolidation.
B. Hydrostatic pressure from saturated soil pushing against the foundation wall.
,C. A shrinkage crack from the concrete curing process.
D. An expansion crack from thermal movement of the foundation.
Correct Answer: B
Explanation: A horizontal crack that is wider at the top indicates the wall is bowing inward
due to lateral soil pressure, a common issue with backfilled foundation walls.
Question 3
An inspector is testing a representative number of electrical receptacles in a home. Using a
three-light receptacle tester, the inspector observes that the center light (amber) is
illuminated, but the two outer lights are not. What is the most significant issue indicated by
this reading?
A. The receptacle is correctly wired and grounded.
B. The receptacle has an open ground.
C. The receptacle has an open neutral.
D. The receptacle has reverse polarity.
Correct Answer: B
Explanation: On a standard three-light tester, the center light indicates the hot and neutral
are correct. The outer lights are for the ground and the hot-ground circuit. No outer light
indicates an open ground.
Question 4
A gas-fired forced-air furnace is inspected. The inspector observes a yellow, lazy flame
instead of a crisp blue flame. What is the most likely cause and the associated safety
concern?
,A. A dirty flame sensor; this causes the furnace to cycle frequently.
B. A cracked heat exchanger; this allows exhaust gases into the supply air.
C. Incomplete combustion due to a lack of primary air; this produces carbon monoxide.
D. Excessive gas pressure; this can cause the flame to lift off the burners.
Correct Answer: C
Explanation: A yellow flame indicates incomplete combustion, often from insufficient
primary air. This produces carbon monoxide, a significant health hazard.
Question 5
An inspector observes a significant amount of water staining on the ceiling below a second-
floor bathroom. The stain is circular and has a dark, discolored center. The inspector should
MOST likely advise the client to:
A. Paint over the stain with a stain-blocking primer.
B. Consult a licensed plumber to identify and repair the source of the leak.
C. Replace the entire ceiling section immediately.
D. Simply monitor the stain to see if it grows larger.
Correct Answer: B
Explanation: The inspector's role is to identify the symptom (stain) and recommend the
appropriate specialist. The source of the leak must be found and repaired by a licensed
plumber.
Question 6
When inspecting a home's grounding system, the inspector finds a copper wire that runs
from the main electrical panel to a metal water pipe. What is the primary function of this
grounding electrode conductor?
, A. To provide a path for electrical current to return to the source during normal operation.
B. To provide a low-resistance path for fault current to travel to the earth, tripping the
breaker.
C. To bond the water pipe to prevent it from becoming energized.
D. To act as a backup neutral connection for the utility company.
Correct Answer: B
Explanation: The grounding electrode conductor connects the electrical system to the earth,
providing a path for fault current to dissipate and ensuring overcurrent devices trip.
Question 7
A roof inspection reveals that the asphalt shingles are curling and buckling. There is also a
significant amount of moss growth on the north-facing slope. Which of the following is the
MOST likely root cause of this condition?
A. Mechanical damage from foot traffic during installation.
B. Inadequate attic ventilation and/or a lack of a proper underlayment.
C. Improper nailing of the shingles during installation.
D. Chemical reaction with the roofing felt.
Correct Answer: B
Explanation: Curling and buckling shingles are often caused by excessive heat and moisture
from poor attic ventilation. Moss growth indicates a moist environment, supporting this
conclusion.
Question 8
