We’ve been house hunting for over a year now, and while the search itself has tested our patience, it’s also taught me a lot — including a few things every homebuyer deserves to know before they’re standing at the closing table. One lesson feels important enough to write down…. its such a valuable lesson that it’s not only for new home buyers: its for everyone!
Before you buy a home, you inspect it. A general inspection, maybe a foundation inspection, possibly a sewer scope. But there’s one inspection that doesn’t always make the standard list and absolutely should: a mold inspection.
We recently found ourselves as the backup offer on a house. The buyer ahead of us had already commissioned a mold inspection and, hoping to save us some money, generously shared the report — assuming we could skip paying for our own.
If you have been following me for a whole you know that mold isn’t a casual topic in our family. We’ve dealt with it in three different homes, along with years of mold detox and the health fallout that comes with it. So we take it seriously, and over time we’ve become genuinely knowledgeable about what a *proper* mold inspection looks like — including which of the handful of local companies we actually trust to do it right.
So we read the report closely. And here’s what made it so interesting: it wasn’t a *bad* inspection, exactly. The inspector’s visual assessment was thorough — he flagged historic water intrusion and called out several areas of concern. But the summary didn’t match the findings, and the testing itself gave a misleadingly incomplete picture of what was actually going on (or could be going on) in that home.
Let me explain: When you take an indoor air sample for mold, the industry standard is 90seconds min of air collection at a calibrated flow rate — which typically pulls somewhere around 22 liters (I could be offof air through the sampling cassette, enough to capture a representative snapshot of what’s actually in the air. This inspector’s samples ran well short of that (30 seconds!) . He collected only two indoor samples for the entire house, plus one outdoor control (which is standard for comparison purposes).
In those two abbreviated samples, two species of toxic black mold showed up (Stachybotrys chart arum and Chaetomium) — but because the sample volume was so small, only a handful of spores registered. On paper, that can look like a non-issue. If you don’t know better, you might read right past it.
But if you know mold, you know 2 things: first, these particular black mold species should never be present indoors, period. Second, when a sample this small still turns up black mold, it’s a strong signal — not a footnote. A standard, full-length sample almost certainly would have returned a much higher spore count and raised real red flags.
Instead, none of this made it into the final summary. Read on its own, the report’s conclusion gives no indication there’s anything to worry about.
When I called the company we actually trust to review the findings (and to do our own inspection ), the inspector I spoke with agreed on every point. He noted the original report should have included cavity testing alongside the air samples — testing behind the walls, which typically requires drilling a small access hole. (For homeowners who don’t want a hole drilled, there’s often a workaround: accessing the wall cavity through an existing outlet or light switch plate instead.) He also felt more indoor air samples were warranted, and that the visual findings — the areas of historic water damage — should have been investigated further to rule out old, hidden mold growth.
Why this matters: If the original buyer, had gone through with the purchase relying on this inspection, they’d have had every reason to believe the home was clear (or in the case of someone testing their home they would expect it to be clear) . They could have lived there for years — accumulating exposure, developing symptoms, chasing down health issues with no idea where they were coming from. That disconnect, between what a report says and what it actually found, plus the lack of proper testing particularly in areas where there is a visual concern of historic water damage, is the whole danger. It’s why the inspection itself matters so much less than who’s doing it and how thoroughly it is done.
If you’re buying a home - don’t treat the inspection as a box to check. Ask about sample duration, sample count, and whether cavity testing is on the table. A short air sample and a clean-sounding summary can hide a real problem.
If you are testing a home you own (or rent) insist on proper testing
So what does a *good* mold inspection actually look like?
