Look for visible mold on walls, ceilings, floors, and around windows
Check for musty odors in rooms, basements, attics, and closets
Inspect areas with water damage, leaks, condensation, or flooding
Test humidity levels with a hygrometer
Use a moisture meter on drywall, wood, and other building materials
Examine HVAC systems, vents, ducts, and drip pans
Check behind furniture, under sinks, and inside cabinets
Inspect bathrooms, kitchens, laundry rooms, and basements closely
Use mold test kits for air sampling or surface sampling
Collect samples from suspicious areas following kit instructions
Compare indoor mold test results with outdoor samples
Hire a certified mold inspector for professional testing
Have a lab analyze collected samples if needed
Fix leaks and moisture problems before retesting
Repeat testing after cleanup or remediation if necessary