Staircases can be indoors or outside. They can be simple, or they can be long and sweeping like in “Gone With the Wind” or tight spirals like in a lighthouse or loft. However, most staircases simply provide a way to get from one floor to another inside your house. It is fairly easy to use a measuring tape to calculate the amount of floor space you need to install this kind of simple, straight staircase in your home.
Measure from the top point of your planned staircase down to the floor along the angle you want your stairs to be. A standard domestic stairway is at a 42 degree angle, but your stairs can be steeper or less steep than that, depending on your preference, the space available and the style of your home. Make a pencil mark where your tape measure meets the floor. This is the farthest point that your stairway will come out on your floor space.