Can a contract be void for vagueness?

Ontario, Canada


The following excerpt is from Hinschberger v Welsh, 2012 CanLII 98283 (ON SCSM):

16. A contract will be void for vagueness if it fails to include reasonable certainty as to the essential elements of (i) the parties to the contract, (ii) the property to be conveyed, and (iii) the price: McKenzie v. Walsh (1920), 1920 CanLII 72 (SCC), 61 S.C.R. 312. In cases where the parties’ agreement is eventually found to lack the necessary degree of certainty, it will often be the case, as in the case at bar, that the parties themselves believed they formed a legally-valid contract. In effect the court finds their mutual belief of fact to have been wrong in law.

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