I think you're talking about using your home as a home office, that's different. I'm talking about when you're working in a location away from your main residen

I think you're talking about using your home as a home office, that's different. I'm talking about when you're working in a location away from your main residence for the purpose of business you can typically claim rental (if it's less than a hotel would cost) for up-to two years even if you do no work at all in the residence.