Extra bathroom storage can be as simple as making use of open areas in artful ways. The windowsill and tub deck here offer narrow spaces for practical items, while slim wall stretches are great for hanging rods with baskets and shelves.
Bathroom Floor Cabinet - lots of storage in a slim little package. I kept focusing on trying to build the wall on the sink side. Didnt even think about adding storage on the wall side. A built in cabinet would be perfect.