A staircase connects different levels of a building. It is a series of steps, usually with a railing or handrail, that lets people move from one floor to another. It is a functional necessity, but it is also one of the most expressive elements in architecture. A grand stair can be the centerpiece of a lobby. A tight stair can be a practical solution in a small house.

Stair design is governed by code and ergonomics. Steps must be consistent in height and depth. A riser that is slightly taller than the others is a trip hazard. Handrails must be graspable and continuous. Landings break up long runs and provide a place to rest.

Stairs come in many types. A straight run is the simplest. A switchback stair doubles back on itself. A spiral stair saves space but is harder to use. A curved stair is dramatic but expensive. The choice depends on space, budget, and the effect you want.

Stairs also shape how a building feels. A wide, open stair invites gathering. A narrow, enclosed stair feels private. The staircase is not just circulation. It is architecture.