Basement and Crawl Space Inspections: Moisture and Water Intrusion
By David Parks · eXp Realty · The Apollo Group · 2 min read
The Short Answer
Basement and crawl space inspections look for water entry, humidity, structural concerns, and pests. Moisture is the most common issue and the one most worth investigating.
Illustration by David Parks
What these spaces are
A basement is a finished or unfinished level below grade. A crawl space is a shallow, usually unfinished area under the main floor of some homes.
Signs of moisture trouble
Stains, peeling paint, or white mineral deposits on walls.
A musty smell or visible mold.
Rusted fasteners or appliances.
Cracks with water marks or efflorescence.
A sump pit, French drain, or dehumidifier already in use.
Quick Poll
Have you ever dealt with a basement or crawl space 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.
What to check
Look at floors, wall bases, and window wells. Inspectors may use a moisture meter. In crawl spaces, they check vapor barriers, insulation, vents, and the condition of framing.
What to do about it
Surface water outside is often the cause, so look at grading, gutters, and downspouts first. Ask the seller about past leaks, repairs, and any transferable warranties. A finished basement can hide issues, so ask for documentation of permits and past work.
Key Takeaways
What these spaces are: A basement is a finished or unfinished level below grade.
Signs of moisture trouble: Stains, peeling paint, or white mineral deposits on walls.
What to check: Look at floors, wall bases, and window wells.
What to do about it: Surface water outside is often the cause, so look at grading, gutters, and downspouts first.
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.