A stair with parallel steps and risers in the same direction is known as a straight stair. It has only a single flight or two or even more in its length, divided by a landing.
Quarter Turn Stair: Stairs that turn through one right angle are called quarter-turn stairs. The steps and the person turn 90° from the bottom to the top of this type of stair.
Stairs that turn in 180 degrees, then they are called half-turn stairs. Newel stairs, open-well stairs, and dog-legged stairs are the types of half-turn stairs.
Dog-legged Stair is suitable for restricted going and when the width of the available space is equal to two flights' combined width.
Open Well Stair is similar to a dog-legged stair, accepting a rectangular hole or opening between flights.
Circular stairs are constructed of winders, and there are two forms of circular stairs spiral stairs and circular geometrical stairs.
Geometrical stairs consist of a hole or opening between the flights. These stairs have either geometrical form, and they don't need a newel post.
A bifurcated stair flight divides at a landing into two narrower flights that branch off to the right and left.
In Spiral Stairs, all the steps radiate from a standard centre or newel post. They are made up of wood, steel, or concrete. It is provided where the available space is less.
To learn more about different types of stairs, flights of stairs, and the characteristics of a good staircase, click on learn more.