Hi, there. While looking around on how to get our credentials assessed from within Canada, I found this:
https://www.cicic.ca/938/interior_designers_and_interior_decorators.canada?id=110
"Interior designers and interior decorators are regulated in Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, and Saskatchewan. In order to use one of the reserved titles, you must be registered with one of the provincial regulatory authorities in Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, or Saskatchewan to be authorized to practise as an interior designer or interior decorator.
Note that the use of one of the reserved titles is not required in order to practise in Alberta, British Columbia, Manitoba, New Brunswick, Ontario, and Saskatchewan, and therefore, certification is voluntary.
Interior designer, registered interior designer (R.I.D.), intern interior designer (I.I.D.), professional interior designer, and licensed interior designer are the titles used in regulations governing this occupation."
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Because interior design is an occupation that's regulated by the government there, you might have to get additional educational training to be certified when you do immigrate there. For now, at least just be ready with your degree/certificate in interior design, project service agreements, and reference letters from clients. I haven't read anything about undergoing any type of interior design certification in one's own country before you apply for PR.