MoldHelpUSAWhat mold testing includes
- An outdoor air sample from the same visit, for comparison
- Air samples in the main living area and bedrooms
- A sample near the floor registers or crawl space hatch
- Surface samples from stains on sills or sheathing
- Accredited lab analysis with a written explanation
Mold Testing in Seattle: local factors
Washington sets no indoor mold limit, and the federal government does not either. A test earns its fee when it compares your rooms with outdoor air taken at the same visit, and when it is aimed at a specific question. If the growth is already in plain sight, the EPA's position is that sampling generally is not necessary.
Does crawl space air reach the rooms?
Air rises from a crawl space into the house through gaps in the floor, around pipes, and through ducts that run below. The pull is strongest in winter, when the house is warmer than the air outside. A sample near the floor registers or the crawl space hatch, set against the bedrooms and outdoors, shows whether the crawl space is part of the indoor problem.
A smell with no visible mold
When a musty odor appears each fall, samples in the rooms where it is strongest, plus a wall-cavity sample where the meter reads damp, help locate hidden growth before anyone opens a wall.
Buying an older Seattle house
Home inspectors look, but most do not sample. For a house with a crawl space or a finished hillside basement, lab work during the inspection period turns a line in the report into numbers; see mold and home inspections.
After remediation
There is no Washington clearance standard. Agree on what counts as a pass before work starts, such as no visible growth, dry materials, and indoor counts in line with outdoors, and hire a tester who is not the removal company.
Cost
HomeGuide's national data puts lab analysis at roughly $50 to $350 per sample, on top of the visit. With several samples and a report, the total approaches a full inspection, about $300 to $1,000 by Angi's national range. If the source is still unknown, start with a mold inspection in Seattle; see mold remediation in Seattle for the cleanup.
Getting a quote
Explain what the test should answer, and the company on the line will suggest a number of samples and a price before you commit. Calling is free.
Mold Testing cost in Seattle
| Job | Typical range |
|---|---|
| Lab sample, each, national (HomeGuide) | $50–$350 |
| Inspection with samples, national (Angi) | $300–$1,000 |
Licensing for mold testing in Seattle
Washington does not license mold testing. Ask which accredited lab analyzes the samples and whether the tester is independent of the remediation company.