Tiny Jack And Jill Bathroom . Make sure to install a lock on each door so everyone can use the bathroom themselves. The separate washbasins are perfectly aligned and allow for personal space and storage of personal effects. The Bostons' Bungalow Jack & Jill from thebostonsbungalow.blogspot.com In small jack and jill bathrooms, look at mirrored cabinets with internal lighting as a simple but effective solution. Make sure to install a lock on each door so everyone can use the bathroom themselves. It is a great solution for connecting to a guest bedroom that is used infrequently.