Building a room

With the building elements you sketch rooms yourself: walls outline the floor plan, windows and doors sit on the walls, stairs mark entrances. All elements resize and rotate freely — a usable floor plan takes just a few minutes, even without an official room plan.

Try it out

A simple room made of four walls with a window and a door — extend it from the left column:

This demo is the real editor — the exact same behaviour as in your plan.