Determine Step Size
Calculating the vertical and horizontal distance for the steps is necessary to determine the number of steps needed as well as the height and depth or "rise" and "run" of each step. The formula for the ideal relationship between the height (rise) and depth (run) of the step is: Twice the rise plus the run should equal 25 to 27 inches. If you can’t make the formula work for you on a hillside, change the length of the stairway. A longer run allows you to have shorter rises. For a shorter run, you’ll need higher rises.
A freshly excavated site creates a clean base. The forms for the concrete foundation are built with 2bys and the concrete is poured. When building forms make sure the concrete is thoroughly dried before removing the boards to prevent the concrete from moving or sagging.