In short: after remediation and before rebuild, an independent tester inspects the work area, confirms it's clean and dry, and usually takes air samples inside the containment (compared with an outdoor sample) and surface samples. If it passes, rebuild starts. If it fails, the area is re-cleaned and retested. A clearance test typically costs about $200–$400.
Why clearance testing matters
Washington has no state mold license, and a finished remediation looks much the same whether it was done well or badly. Fresh plastic, a cut-out wall and no visible mold don't prove anything. The clearance test is the one objective check you get before the evidence is covered by new drywall.
- It catches missed areas: corners, wall cavities a bay over, the backs of baseboards
- It catches poor cleaning: settled dust and debris full of spores after demolition
- It gives you a document for a buyer, a landlord, a tenant or an insurer
- It settles arguments before they start, because the pass criteria are agreed in writing
Why it should be independent
A remediator testing its own work has an obvious conflict of interest. That's why we have an independent tester do the clearance, not us. It's also why we don't seal or encapsulate surfaces before the test: a coat of encapsulant over a surface makes it impossible to sample, so it can hide poor work.
You're welcome to choose your own independent tester, or we can recommend local indoor environmental professionals who have no financial stake in our work.
What a clearance inspection checks
Visual
No visible mold or debris in the work area, all planned materials removed, and the containment intact.
Moisture
Framing and other materials back to normal moisture readings, so rebuild won't trap water.
Air samples
Spore-trap samples inside the containment, compared with an outdoor sample taken the same day. Indoor levels and types should be similar to or lower than outdoors.
Surface samples
Tape lifts or swabs on cleaned framing and surfaces, checked for remaining growth.
Report
A written result: pass, or fail with the areas that need more work.
What "passing" means, in writing
Clearance criteria should be agreed before work starts, not argued about afterward. Your contract with us states what a passing result is, so nobody can change the definition at the end. If the area fails, we re-clean it and pay for the retest.
Red flag: a company that backpedals or adds a charge when you ask for independent clearance testing, or won't put pass criteria in writing.
When to schedule it
After removal, cleaning and drying are done, and before the containment comes down and before any encapsulant, insulation or drywall goes in. Air samples are usually taken after the negative air has been off long enough for the tester's protocol. Results commonly come back within a few business days, depending on the lab.
Clearance testing for real estate and rentals
A passing clearance report, with the scope, photos and moisture readings, is the best document you can give a buyer, an appraiser or a tenant. If you're selling, it belongs in the file you hand over with your Form 17 disclosure. See selling a house with mold.