A powder room is one of the smallest rooms in a new home, and a few inches decide whether it feels tight or comfortable. Half bath dimensions start with fixture clearances, not a set square footage, so the time to get them right is while your floor plan is still on paper. Key Takeaways What Are Standard Half Bath Dimensions? There’s no standard size you can look up, because code doesn’t set a minimum floor area for a half bath. Instead, the room’s size comes from three things: the clearance code requires around each fixture, the roomier clearance NKBA recommends, and