This stair cover is made from a Japanese carport canopy. It protects the walkway between the garage and the house. Because the Japanese aluminum canopy is very lightweight, it can be installed on top of a roof or on a wall.
The prefabricated carports consist of individual aluminum profiles connected into a frame. Although this specific carport is no longer available, you can achieve a similar installation with an LJ-Port or U-Style-Port roof unit.
For a staircase cover, you can also use the REVOLU patio cover system. Here is an example.
There is also a line of commercial walkway covers for public spaces such as airports and shopping malls, and YES, you can buy these!