Filling a wall with cabinetry might seem like an extravagant use of precious floor space in a small bath, but it can both maximize storage and create a place to park your towels (or yourself) as the tub fills. Here, a deep cabinet that's accessed from the side offers a spot for stowing bought-in-bulk paper products. Open the flip top on the bench to find space for extra towels and grooming supplies.
Design doors on a built-in storage unit to open over the seat, rather than into the room, where space is tight.
Tip: When adding a lift-up lid that will be opened by kids, consider installing safety hinges to prevent it from slamming down on small hands.