What should I include in a demand letter in Ontario?

A well-drafted demand letter in Ontario should clearly identify who you are and who you are writing to, describe the facts giving rise to your claim in plain language, state precisely what you want the other party to do, and set a firm but reasonable deadline.

Include the following key elements: the date and full contact information for both parties; a factual summary of the dispute (what happened, when, and how it caused you harm); the specific remedy you are seeking, such as a dollar amount or the return of property; a clear deadline for response or payment; and a statement of what you intend to do if the demand is not met (for example, commence proceedings in Small Claims Court or Superior Court of Justice).

Keep the tone professional and factual. Courts and opposing parties take firm, measured letters more seriously than emotional or threatening ones. Avoid exaggerations or personal attacks, and do not make legal claims you cannot support. Attaching supporting documents — invoices, photos, contracts — can strengthen your position. A lawyer can review your draft to ensure it accurately reflects your legal entitlement and does not inadvertently weaken your case.