New homes lack many of the features found in old-school houses, like laundry chutes, milk doors, and dumbwaiters. But a new kind of door is becoming more popular in new houses and is a commonly requested feature in home renovations: the Costco door. This little half-door goes from the garage into the kitchen, pantry, or mud room and is supposed to make it easier to unload the SUV full of bulk goodies from Costco. Do you have a door like this? Would you want one?