The first step in building a railing for outdoor steps is to dig two 18-inch deep holes at the base of the stairs, directly in front of the last step on both ends. Set two 5-foot-tall 4x4 posts into these holes and set them with concrete.
These posts must be stabilized at the 4-foot level for at least 24 hours so that they are set perfectly vertically. The concrete used should have the consistency of toothpaste. Next, the hand rail material should be laid upon the stairs, alongside the posts. The angle between the posts and the handrail determines the angle of the stairs. Measure 35 inches up the posts from the appropriate stair to find the level at which the railing will be attached, and mark this point. This must be done on both sides of the stairs.
The railing must be cut using the angle measurements recorded earlier and a circular saw set to its deepest setting. Lay the railing on top of the posts and move it so that equal amounts of the remaining rail hang off the end posts. Attach the railing using five 3-inch deck screws per post. Sand the hand railing to prevent splinters.