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Stair Stringers (7) Stair stringers form the backbone of a set of stairs. By code, stairs need to be at least 36 wide. Although it's usually possible to get away with just using two stringers, we recommend you add a third one down the middle. This extra stringer will ensure your stairs are exceptionally rigid.
1 Consider carpet quality, design, and length and width. 2  Standard stair is 30 inches (76.2 cm) wide. 3  Allowing for 3 inches (5.08 cm) on either side to display the wood, you need 24 inches for each stair step and riser.