No, the lumber must be grade stamped in accordance with the National Building Code of Canada which requires adherence to “CSA-O141 Softwood Lumber” where it states:

• The lumber is graded in accordance with grading rules approved by CLSAB.
• The lumber is inspected and identified in accordance with the Regulations of CLSAB.

However, homeowners or builders that want to build a structure with lumber that they have personally milled or purchased that is not grade stamped can contact and make arrangements with a CLSAB Accredited Agency (https://www.clsab.ca/clsab-accredited-agencies/) for the Agency to grade and stamp every piece of lumber to be used in the structure that satisfies the required NLGA grade.