Personal Injury Law: Westerhof a welcome decision that will reduce litigation costs – August 2025

While litigation experts hired by a party to a lawsuit must comply with the comprehensive expert report rules set out in Rule 53.03 of the Ontario Rules of Civil Procedure, participant experts such as treating health practitioners and non-party experts such as those hired by a non-party insurer don’t need to comply with the rule in order to provide expert opinion evidence at trial, according to the Ontario Court of Appeal in its pragmatic and much-anticipated decision in Westerhof v. Gee last week.

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