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Calculating space for stair constructionMost stair construction in smaller homes is easy with the right formula. Many modern stairs will have landings because of the room it saves. Plus, landings are very popular right now.
Next, divide 108 by 15 and you get about 7 3/16 inches. This is the height each stair riser needs to be. A typical tread is right around 10 inches. The amount of treads will be one less than the amount of risers(14 treads), to find the total run or length of a single run staircase, multiply 10 by 14 and that tells you your stairway will be 140 inches long. The width of typical stairs is four feet. A space of 140" x 48" will accommodate the staircase in this example.
The equation for determining the amount of risers is standard for any style of stairs, however, figuring how much floor space your staircase will take up depends on which design you choose.
Stairs with landings use the same mathematical formula. You just measure from the floor up to the top of the landing and calculate that distance. Then you measure from the landing up to the second floor for second measurement.
Will you have a long single flight of stairs or will you divide the ascension with a landing. Perhaps a circular staircase is what you desire or a single flight with a gentle curve. Will your stairs be open to the second story ceiling? Or will you utilize the dead space above? Below are some examples of staircases. Dual Landings Staircase
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