Design: Elit Metalcraft A straight staircase can be defined as one having a single, straight flight of stairs that connects two levels or floors in a building. A straight staircase is one of the oldest and most common types of staircases found in buildings. The straight flight staircase is feasible only if there is enough space to join two levels by an imaginary straight line. There are many different types of staircases with landing. Some popular types are the, Straight staircase with landing, L-shaped, double L-shaped and U-shaped staircases.