Is a property that was used as a drug lab treated differently than a former grow-op for disclosure purposes in Ontario?

The underlying legal principle is the same for both: Ontario disclosure duties turn on whether a seller knows of a hidden condition that makes the home dangerous or unfit to live in, not on the specific label attached to the property's history. In practice, though, a former drug lab is frequently a more serious physical concern than a former grow operation, since manufacturing activity can leave behind chemical residue absorbed into drywall, insulation, flooring, and ductwork that is harder and more expensive to remediate than the electrical and moisture issues typically left by a grow-op.

Because that chemical contamination can pose a more direct and lasting health risk, a seller who knows a property was used as a drug lab and knows that use left the home genuinely unsafe faces the same disclosure obligation as with any other known, hazardous latent defect, arguably with higher stakes given the nature of the residue involved. Buyers with any reason to suspect this history should ask directly, request any available records from local authorities, and insist on specialized environmental testing rather than a standard home inspection, since typical inspections are not designed to detect chemical residue.