What extra due diligence should a buyer do before purchasing a heritage-designated property in Ontario?

A buyer considering a heritage-designated property should start by obtaining and carefully reading the actual designating bylaw, since it identifies exactly which attributes are protected and defines what future alterations will need municipal approval; a general sense that the property is "heritage" isn't enough to know what's actually restricted. It's also worth checking whether the property sits within a Heritage Conservation District, which can layer additional plan-based requirements on top of any individual designation, and whether a heritage conservation easement is registered on title, since that can impose further binding conditions.

Beyond the legal documents, buyers should ask the municipality's heritage planning staff about the property's compliance history, including whether any past alterations were done with proper approval, since unauthorized changes made by a previous owner can become the current owner's problem to resolve. It's also worth asking about any available tax incentive or grant programs tied to heritage properties, since maintaining protected features can be more costly than typical upkeep. Getting a clear picture of what the property's current condition and compliance status actually are, rather than assuming everything was done properly, avoids unwelcome surprises after closing.