Bath Sizes and Distance Requirements Including Bathroom Sinks and Minimum Distances Between Fixtures Such as Toilets to walls. Common bathroom sizes for remodeling and home building purposes are displayed with sizing requirements stating sizing requirements such as a 2 fixture bathroom requires a least a size of 5' x 4' and a 3 fixture bathroom requires a least a size of 5' x 7'. The distances between two bath fixtures are also clearly stated down to details such as measurements from toilets to walls and the toilet paper roll holder height. more »