Should I Build a Basement Bathroom?

[John Seitz]

Hello, 

I'm new to the field and looking for advice. I'm eyeballing a house with an unfinished basement that is in really good shape (dry as a bone, well-maintained, etc.) The main bath on the first floor (the only bath) is pretty small and tight. There's no way to expand it without knocking out the back wall of the house which I don't want to do at this point. I was thinking of refinishing part of the basement, would it be worthwhile to add a bath? Half or Full? There is currently no plumbing for a bath in the basement so this would be from scratch.

Thanks, John