I couold be wrong but I had a brother-in-law in Saskatchewan who ran a business office out of his home. It had to be a definite space with a door to close it off to the rest of the house. His was in the basement. I ran a simple google search and found this information - look at the link there are specific criteria thses days to use a home space for your business.
http://www.bookkeeping-essentials.co...-expenses.html
Good luck.