See standard Shower sizes & dimensions, Toilet sizes & space requirements, bathroom Sink spacing issues, Tub placement & sizes, and overall Bathroom Room Sizes for a full bath, small bath, half bath, and water closet / powder room. Plus, ADA bathroom requirements and online tools to save time & money designing a bathroom.See standard Shower sizes & dimensions, Toilet sizes & space requirements, bathroom Sink spacing issues, Tub placement & sizes, and overall Bathroom Room Sizes for a full bath, small bath, half bath, and water closet / powder room. Plus, ADA bathroom requirements and online tools to save time & money designing a bathroom.