ILLINOIS HOME INSPECTOR LICENSE
EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025
1. What is the primary purpose of a home inspection?
To provide a visual evaluation of the property's condition
A home inspection identifies visible defects and safety issues; it is not an
appraisal or a code compliance inspection.
2. Which of the following is a common sign of roof leakage?
Stains or discoloration on the ceiling
Water stains on ceilings often indicate roof leaks or plumbing issues
above the ceiling.
3. What is the minimum height requirement for residential guardrails in
Illinois?
36 inches
Residential guardrails must be at least 36 inches high to prevent falls.
,4. What type of foundation is typically made from poured concrete?
Basement foundation
Basements often use poured concrete walls, providing structural support
below grade.
5. When inspecting electrical panels, what should the home inspector check
for?
Proper labeling of circuits and absence of double-tapped breakers
Proper labeling helps future servicing, and double-tapped breakers can
cause overheating and failure.
6. Which material is commonly used for water supply pipes in modern
homes?
PEX (cross-linked polyethylene)
PEX is flexible, resistant to corrosion, and easy to install, increasingly
common in plumbing.
7. What is the maximum allowable spacing for residential floor joists?
16 inches on center
Typical floor joists are spaced 16 inches apart to support floor loads
adequately.
8. What type of heating system uses air ducts to distribute warm air?
Forced-air heating system
Forced-air systems heat air in a furnace and distribute it through
ductwork.
, 9. How should a home inspector check for adequate attic ventilation?
Look for soffit vents and ridge vents or other exhaust vents
Proper ventilation prevents moisture buildup and prolongs roof life.
10.What is the purpose of a GFCI outlet?
To protect against electrical shock by breaking the circuit when there is a
ground fault
GFCI outlets detect imbalances and quickly shut off power, preventing
shocks.
11.Which sign indicates possible foundation settlement?
Cracks in the drywall near doors and windows
Settlement can cause structural movement, leading to cracks especially
near frames.
12.What is the minimum slope required for a drainage system away from the
foundation?
6 inches drop over 10 feet
Proper grading ensures water flows away from the foundation,
preventing water intrusion.
13.Which material is NOT commonly used for residential roofing?
Glass
Glass is not practical or common for roofing due to fragility and insulation
issues.
14.What is a typical defect found in aluminum wiring?
Oxidation leading to poor connections and fire risk
EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025
1. What is the primary purpose of a home inspection?
To provide a visual evaluation of the property's condition
A home inspection identifies visible defects and safety issues; it is not an
appraisal or a code compliance inspection.
2. Which of the following is a common sign of roof leakage?
Stains or discoloration on the ceiling
Water stains on ceilings often indicate roof leaks or plumbing issues
above the ceiling.
3. What is the minimum height requirement for residential guardrails in
Illinois?
36 inches
Residential guardrails must be at least 36 inches high to prevent falls.
,4. What type of foundation is typically made from poured concrete?
Basement foundation
Basements often use poured concrete walls, providing structural support
below grade.
5. When inspecting electrical panels, what should the home inspector check
for?
Proper labeling of circuits and absence of double-tapped breakers
Proper labeling helps future servicing, and double-tapped breakers can
cause overheating and failure.
6. Which material is commonly used for water supply pipes in modern
homes?
PEX (cross-linked polyethylene)
PEX is flexible, resistant to corrosion, and easy to install, increasingly
common in plumbing.
7. What is the maximum allowable spacing for residential floor joists?
16 inches on center
Typical floor joists are spaced 16 inches apart to support floor loads
adequately.
8. What type of heating system uses air ducts to distribute warm air?
Forced-air heating system
Forced-air systems heat air in a furnace and distribute it through
ductwork.
, 9. How should a home inspector check for adequate attic ventilation?
Look for soffit vents and ridge vents or other exhaust vents
Proper ventilation prevents moisture buildup and prolongs roof life.
10.What is the purpose of a GFCI outlet?
To protect against electrical shock by breaking the circuit when there is a
ground fault
GFCI outlets detect imbalances and quickly shut off power, preventing
shocks.
11.Which sign indicates possible foundation settlement?
Cracks in the drywall near doors and windows
Settlement can cause structural movement, leading to cracks especially
near frames.
12.What is the minimum slope required for a drainage system away from the
foundation?
6 inches drop over 10 feet
Proper grading ensures water flows away from the foundation,
preventing water intrusion.
13.Which material is NOT commonly used for residential roofing?
Glass
Glass is not practical or common for roofing due to fragility and insulation
issues.
14.What is a typical defect found in aluminum wiring?
Oxidation leading to poor connections and fire risk
