Stair design is part of interior and architectural design, which pays attention to the placement and shape of stairs as part of the design of a house or building.

Stairs have several main functions, such as providing access to certain floors or areas in a building, assisting in the movement of goods and people, and providing vertical connectivity between floors.

There are several types of stairs that are commonly used, including:

Spiral Staircase: has a circular shape and is usually made of iron or metal.
Straight Ladder: has a simple shape and is shaped like a steel ladder.
Straight Stairs with an Open Center: similar to a straight ladder, but has an open center.
U stairs: have an inverted U shape and allow people to walk up and down them easily.
Round Stairs: have a circular shape and are usually made of wood.
The design of the stairs must consider comfort, safety and aesthetics, and must match the layout and style of the building.