Adding a Second Bathroom, best spot?

[Nicholas Sanchez]

New to adding a second bathroom to a home. EB is where the electrical box is and WH is the water heater. 

Where would be the best place to possibly add a second bath with the least renovation needed? 

I was thinking of possible adding the bathroom where that laundry room is and move the laundry room next to the water heater with a stacked washer/dryer unit. 

House is on a slab.