When building stairs, how high and and wide should each step be
In residential buildings, the minimum stair width is usually 32 inches while the standard is 42 inches. If the stairs are more than 44 inches wide a handrail is required on both sides. The unit run is the distance from the front to the back of a single step, while the unit rise is the vertical distance between two stairs. The recommended size is a 10 inch run and a 7 inch rise.