When I first started selling real estate in 1989, I thought that after working over ten years in mortgage banking, I knew "everything".   I soon discovered, I didn't know the proper name of  many architectural elements found in our (Los Angeles) vintage homes.

Wikipedia states: "A porte-cochere (French porte-cochère, literally "coach door", also called a carriage porch) is the architectural term for a porch or portico-like structure at a main or secondary entrance to a building, through which it is possible for a horse and carriage or motor vehicle to pass, in order for the occupants to alight under cover, protected from the weather."

Or, (simply) if architecturally appealing: an attached car port.