Is the backpack room behind the main room bigger than the main room?

According to Sohu. Com, the front and rear houses are a little higher than the front ones. For good lighting, the backpack room behind the main room can be larger than the main room.

House backpack means that some buildings are closed by cantilever, and the area above the first floor is expanded. This part of the building has no foundation, just like a backpack, commonly known as the backpack area.