Adding a second bathroom in the basement in a bungalow?

[KATHY H.]

First post here... I am interested in a bungalow with 3 bedrooms 1 bath (2 bedrooms on the main floor and a big bedroom on the second floor) located in metro Detroit. I was initially thinking to add a second bathroom on the second floor to make it a true master bedroom suite. However, since it is a bungalow, the space I could work with is minimal and the cost is high. Alternatively, I saw bungalows in the neighborhood have added the second bathroom in the basement. My question is i) is it common to add a second bathroom in the basement, and ii) the basement is currently unfinished - would I need to finish the basement in order to have the second bathroom?

Many thanks!