When you need certified mold removal
You should probably insist on certification for any mold job, but a few situations make it a hard line. Insurance claims need documentation from qualified professionals, and a handwritten receipt from some guy with a spray bottle can sink your claim. Real estate transactions where mold has been flagged need clearance testing and reports that carry weight at closing. If anyone in the house has asthma, allergies, or a compromised immune system, you need verified results, not a visual "looks clean to me." And if mold came back after another company treated it, that's your sign the first job wasn't done right. Wisconsin doesn't license mold remediators at all. Anyone can call themselves a mold guy. Not everyone can prove they know what they're doing.