As long as you have a little available space, access to sufficient electrical outlets, ventilation and adequate sound insulation, you can sneak a new bathroom almost anywhere in your home. It may feel like you don't have any available space to spare, but there's a good chance you just don't know where to look.
How much does it cost to add another bathroom?
National Average Cost $7,600
--------------------- -----------------
Minimum Cost $2,500
Maximum Cost $25,000
Average Range $4,500 to $12,400