Does a former grow-op property need a remediation certificate before it can be legally resold in Ontario?

There is no single, universal provincial certificate specifically required before every former grow-op can be resold in Ontario; what's actually required depends on what physical work, if any, was done to the property and whether local municipal processes were triggered by that history, such as an order requiring remediation of electrical or structural alterations discovered by the municipality. Some municipalities have taken enforcement action on specific known former grow-ops, which can result in local compliance requirements tied to that particular property rather than a general provincial certification scheme covering all such properties.

What matters more consistently for resale is the underlying disclosure principle: a seller who knows the property was a grow-op and knows that history left it unsafe or uninhabitable generally must disclose that, separate from whether any formal certificate exists. A buyer considering a known or suspected former grow-op should ask the municipality directly whether any order or compliance file exists for that address, request records of any remediation work actually performed, and have a qualified inspector specifically evaluate the electrical system and check for moisture damage, rather than assuming a completed sale in the past means the property was ever formally cleared.