Whats considered a bedroom?

[Todd Snyder]

In the newest Real Estate podcast Joe Asamoah talks about turning the basement of homes into extra bedrooms. It got me thinking, what will an appraiser consider a bedroom in Ohio? What are the specific things that the room would need? Would I need to pull permits when constructing these bedrooms? What would I look for in a property if I wanted to do this? Thanks for your time!