Ok I'm confused... Straight from the Marshall and Swift guide... ATTACHED GARAGES share a common wall with the residence. The attached garage costs include interior finish for only that wall which is common. (Shows picture of a house with garage which shares its left side wall with the home... garage stretches all the way to rear of the house) BUILT-IN GARAGES have living area both adjacent to and above. Costs include finish for all common surfaces. (Shows picture of two story house where garage shares left wall with first story, and garage ceiling is the floor for second story. Garage again goes all the way to the back of the house..) My question is: What is it classified as when the garage shares both its side wall and REAR wall on a single story home?