You shouldn't have to. There is a permit page on the city of Calgary website. You go through steps explaining your home business (employees? How many kids etc) and they tell you what kind, if any permit is necessary. If you have 6 or fewer kids and no employees you don't have to get any permits according to their website. If you plan to expand beyond the 6 kids then zoning gets involved (developments permits, traffic studies, lots of headache).