Mold and Moisture: What Inspectors Look For and When to Test
By David Parks · eXp Realty · The Apollo Group · 2 min read
The Short Answer
Mold needs moisture to grow, so the most important question is where water is coming from. A visual inspection can spot signs of moisture, and lab testing is used when more detail is needed.
Illustration by David Parks
What causes mold
Leaks, high humidity, poor ventilation, and past water damage can all lead to mold. Basements, bathrooms, attics, and areas around windows are common places.
Signs to watch for
Musty odors, especially in basements or closets.
Visible spots or staining on walls, ceilings, or around vents.
Peeling paint or bubbling drywall.
Condensation on windows or cold pipes.
Past patching or fresh paint in odd places.
Quick Poll
Have you ever dealt with a mold or moisture problem?
You are not alone. Get the findings in writing from a licensed professional, keep photos and receipts, and if you are buying, use the report as a negotiation point before your inspection deadline. Talk with David if you want a second opinion on what matters.
Good news, but this is exactly the kind of issue that can stay hidden until someone looks. Add it to your inspection checklist or ask your inspector about it before you buy or sell.
That is very common. The simplest way to know is to have it checked. Ask David which inspections are worth adding for the home you are considering. Talk with David.
Testing and next steps
Inspectors may use a moisture meter or thermal camera to find damp areas. Air or surface sampling is sometimes added when concerns are higher. If mold is found, a remediation specialist can fix the cause and clean affected areas.
Buyer tip
Fixing the moisture source is more important than cleaning the surface. Ask about past leaks and repairs, and check whether bathroom fans and dryer vents exhaust outside.
Key Takeaways
What causes mold: Leaks, high humidity, poor ventilation, and past water damage can all lead to mold.
Signs to watch for: Musty odors, especially in basements or closets.
Testing and next steps: Inspectors may use a moisture meter or thermal camera to find damp areas.
Buyer tip: Fixing the moisture source is more important than cleaning the surface.
This article is general information, not legal, tax, financial or inspection advice. Every home and situation is different, so confirm details with a licensed inspector, lender, attorney or tax professional.
David is a Greater Denver real estate advisor with eXp Realty and The Apollo Group (Colorado broker license FA100103211). He has closed more than $55 million in volume, earned eXp Icon status in 2025, and holds a 5.0 rating on Zillow from 27 verified reviews.