What Are the Signs of Mold in a Home or Business?

Detecting mold early is critical for protecting both your health and your property. In the Seattle area, where rain and humidity levels are often high, mold growth can occur quickly—especially in places like basements, attics, and poorly ventilated bathrooms. So how can you tell if you have a mold problem?

Common Signs of Mold in Homes and Businesses

  • Musty or damp odors: One of the earliest and most persistent signs of mold is a musty smell. This odor often lingers in closed spaces such as closets, crawl spaces, and basements—even when the area appears clean.
  • Visible discoloration or staining: Mold often appears as black, green, or brown spots on walls, ceilings, tile grout, drywall, or wood surfaces. It can also grow behind wallpaper or inside cabinets where moisture is trapped.
  • Warped or bulging walls: Moisture behind walls may cause drywall to warp, bubble, or peel—clear indications that mold may be growing underneath the surface.
  • Increased allergy symptoms: Mold exposure may trigger sneezing, runny nose, coughing, itchy eyes, headaches, or worsening asthma symptoms—especially when indoors. If symptoms improve when you leave the building, mold could be the culprit.
  • Condensation on windows or walls: Persistent moisture or condensation buildup is often a precursor to mold, especially in older homes or buildings with poor ventilation.

Where Mold Commonly Grows

In Seattle and the surrounding areas, mold often grows in:

  • Basements and crawl spaces with poor drainage or foundation leaks
  • Attics with insufficient ventilation or roof leaks
  • Bathrooms lacking exhaust fans or regularly exposed to steam
  • Window sills and drywall near leaky windows or condensation-prone areas
  • HVAC systems where moisture can collect inside ducts

Is It Always Visible?

No—mold often grows inside walls, under flooring, or above ceilings where you can’t see it. That’s why odors, unexplained allergies, and moisture problems should never be ignored.

What to Do If You Suspect Mold

If you notice any of the signs above, don’t wait for the problem to get worse. Mold spreads fast and can damage your home’s structure, belongings, and indoor air quality. At Eco Water Restoration, we offer professional mold inspections and remediation throughout Seattle, Bellevue, Tacoma, and surrounding areas.

Call us 24 hours a day, 7 days a week at (253) 204-3646 or contact us online to schedule a mold assessment.

For more information, visit our blog post on the top signs of mold and how to spot them early.

Ivan Mukomol
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