C-25.01, r. 9 - Regulation of the Court of Québec

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8. Contact information. Parties, and their lawyers or notaries, must inform the court office concerned without delay of any change in their contact information; for lawyers, a change of address made in the master file is sufficient.
Parties who are not represented, including parties involved in a small claims matter, must give the court office concerned their name, address and postal code, and a telephone number and e-mail address, if available, where they can be contacted. They must ensure that the information is kept up to date and inform the court office without delay of any change.
O.C. 1099-2015, s. 8.