48+ Standard Chair Rail Height Gif. For these stair rail systems, the top rail may serve as a handrail, provided the top rail is 36 to 38 inches in height (as measured at the leading edge of the stair tread to the top surface of the top rail) and meets all other handrail requirements in ยง1910.29(f). Installation heights for chair rail can vary, but the standard height is 1/3 the height of the wall.
The best width for chair rail molding will vary a bit, depending on the dimensions and the wall color of the room.
The long answer might make you regret asking the question. Here's the answer for same. What's the correct height for chair rail and wainscot? Similar to table height, there is no definite industry standard for chair heights.