There are minor variations in the law, but, essentially, yes. If you prepare food that requires handling on your end, be it cold assembly, or cooking, then package it for sale, you must follow basic UBC and Health Codes, which require that you use a sanitary kitchen. And that you have inspected facilities for cooking, packaging and cooling. If it is being prepared and then heated by you, then the requirements are generally a lot more lax. But, that is because, you as the cook/preparer, are also the person selling and serving, so the reheat is still on you.