We are converting part of our home to a rental apartment. How should we consider these costs for our taxes - deductible expenses or as improvements to our home?

We will be upgrading from 1/2 to 3/4 bath, putting in a separate entrance and small balcony, repainting, and shifting some walls around. Some is clearly adding value to our home, other not so clearly, just changing it up - and none of it would be done if not for the goal of renting it out. Also, I own the home jointly with my brother and husband, so that does complicated it a bit more - we were planning to create a separate LLC and run the rental income and expenses through the LLC.