A telescoping rail assembly for a roof hatch includes a bracket configured to couple to the roof hatch, where the roof hatch is configured to provide access to a roof of a building, a post coupled to the bracket and configured to extend from the roof hatch and outward from the roof, and a telescoping rail having a first portion and a second portion, where the first portion and the second portion are slidably adjustable with respect to one another, and where the telescoping rail is disposed along a portion of a perimeter of the roof hatch to enable the telescoping rail assembly to enclose an area that includes the roof hatch.