Yes, if you worked from home, you can claim work from home expenses, even if you only live/work out of one room. To figure out how much you can claim, you would have to figure out how much time you use your room for business purposes, and base your claim on that. You can use the CRA website to help you figure out what amounts to enter: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...
However, it may be easier just to claim the flat rate (up to $500), unless you know that your actual expenses will net you a bigger deduction.
