How can I connect three staircases to form a T-shape?
In Chief Architect, multiple stair sections can be connected using stair landings. Up to five stair sections can be connected to a single landing, allowing a wide variety of staircase and landing combinations in your plans.
There are a couple of ways to create a stair landing. You can draw the desired landing shape using the CAD tools and then convert it into a landing, which is very useful in some situations; however, an easier method uses the Straight Stair tool.
from the menu, then click and drag the first section of stairs in floor plan view.
tool still selected, click and drag a second section of stairs running perpendicular to the first, with the corners touching.
tool still selected, click in the space between the two staircases. A landing will be created and the stairs will form an L-shaped design.


from the menu to see the results in 3D.