Is parole evidence admissible to vary or modify the express terms of a written contract?

Saskatchewan, Canada


The following excerpt is from Ceapro Inc. v. Saskatchewan (Government), 2008 SKQB 237 (CanLII):

Generally speaking the rule is that parole [sic] evidence is not admissible to vary or modify the express terms of a written contract. If the parties have reduced the terms of their contract to writing in clear and unambiguous manner, the express terms define the mutual obligations of the parties. Oral evidence in contradiction of the terms is inadmissible. Hawrish v. Bank of Montreal, 1969 CanLII 2 (SCC), [1969] S.C.R. 515.

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