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The most common kitchen counter height is 36 inches, but it can vary from 30 to 45 inches. The standard kitchen sink is 8 inches deep, which means that the normal distance between a kitchen sink drain and the floor is 28 inches. This will vary, depending on the height of the counter and the depth of the sink bowl. In the bathroom, the sink drain is typically between 24 inches above the floor.
Bathroom Sink Requirements. 1  Sink Height -- The maximum distance from the floor to the highest point on the sink cannot exceed 34 inches. If the sink is on a counter, it must be placed as close to the front as possible, and the counter must be less than 34 inches in height if the rim of the sink extends above it. Knee Space -- The distance from the bottom of the sink apron to the floor must be at least 27 inches.