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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.
ADA suggests at least 17 inches out from the wall, with at least 29 inches off the finish floor to the bottom of the sink; you may alter this according to the needs of the private user. Anything beyond 3 feet or so off the finished surface of the floor is hard to reach. If the sink is located within an actual countertop and vanity set, there should be no more than a few inches of space along the front edge between the edge and the sink.