What is a chain of title and why does it matter?

A chain of title is the complete sequence of recorded ownership transfers for a property, stretching back through time. Each link in the chain is a registered document — a deed, transfer, or court order — showing who owned the property and how ownership passed to the next person.

The chain matters because a flaw in any earlier link can affect your ownership today. For example, if a past transfer was forged, signed by someone without authority, or never properly registered, it could cast doubt on whether every subsequent owner — including your seller — had valid title to pass on. This is called a title defect.

In Ontario, most properties are in the Land Titles system, where the province essentially guarantees the state of title at the time of registration. This gives buyers a higher level of protection than the older Registry system, where buyers had to trace and verify every link themselves. Even under Land Titles, however, gaps and off-title matters (like unpermitted structures or survey irregularities) can exist. Your lawyer's title search, combined with title insurance, is how you protect against hidden defects that pre-registration searches might miss.