Finally, the gate is a crucial part of any fence. Without one, there is obviously no way to access the pool area you’ve secured. A wrought iron pool gate will be 4 to 5 feet wide and made to match the height of its surrounding fence. To maintain uniformity, iron gates feature the same design as the fence’s panels with many of the same dimensions: 1-inch square railings, pickets sized according to the fence, and a 4-inch spacing.