In this case placing a corner sink across from the toilet works better than a sink across from the shower. The opening and closing of the shower door usually creates an awkward walk-around condition.
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When space is at a minimum, mounting a towel bar on the shower door keeps towels handy. You might need to store the bulk of your towels in a nearby linen closet, but having that one towel close by to dry off with is essential.
Designers: Please share your latest small-bathroom design tip below!