An elevator car includes a car box. The car box includes a frame structure that includes a floor element, vertical beams connected to the floor element, and roof beams connected to the vertical beams. The car box further includes walls, each including wall elements of rectangular shape fixed side-by-side to the frame structure and extending from one edge side of the car box to another. The car box includes a roof including roof elements of rectangular shape fixed side-by-side to the frame structure and extending from one edge side of the car box to another. The car box includes and interior bounded by at least the floor element, the walls, and the roof. At least on set of elements, of the roof elements and the wall elements, includes elements associated with separate, respective integrated functionalities.