Mold Inspection in Seattle, WA

When an inspection earns its fee

If you can see a small patch on a bathroom ceiling and you know why it is there, you probably don't need an inspector. The Washington Department of Health says that in most cases you can see or smell mold, so sampling to prove it exists is rarely needed. An inspection makes sense when the question is where and how much:

• A musty odor in a closed-up room, crawl space or daylight basement with no visible source.
• A past leak, plumbing failure or flooding, such as the December 2022 king tide that pushed the Duwamish into homes in South Park.
• Peeling paint, stained drywall or soft spots near windows after a wet winter.
• Buying or selling an older house with a vented crawl space or a finished basement.
• Planning remediation and wanting a scope that isn't written by the company doing the removal.

What the inspector should do

Expect a walk-through of the whole house, not only the room you called about. A thorough inspector checks the attic for condensation from bath fans and poor ventilation, the crawl space for standing water and wet insulation, window frames for winter condensation, and plumbing walls with a moisture meter. They should ask how you heat the home and whether you run fans, since many Seattle homes rely on baseboard or forced-air heat with little mechanical ventilation.

Testing is optional, not automatic

EPA says that when mold is visible, sampling is usually unnecessary, and there are no federal limits for mold spores to compare results against. Air or surface samples can still help with a specific question, such as confirming a cleaned area or checking a suspected hidden problem. If an inspector pushes lab tests before looking for moisture, ask why.

What it costs

Puget Sound prices vary with the size of the home, crawl space and attic access, and how many samples, if any, are taken.

What the report should tell you

Ask for a written report with photos, moisture readings by location, the likely water source, the estimated area affected, and recommendations. Washington has no state mold certification, so ask about training and experience; some inspectors come from industrial hygiene or environmental consulting backgrounds.