The side walls of my attached, single-car garage are crumbling, the foundation is crumbling, and the floor is deteriorating and pitted. The house was built in 1948. It has aluminum siding. I'm in the northeast U.S.
The house's interior walls are plaster and lath. I don't know what the garage walls are. I thought they were plaster, but it's coming off in chunks that look more like old drywall. I'll attach some photos of the exterior side wall and of the pitted floor. (The back wall is not exterior; there's a sunroom behind it.) I have no idea where to start or whom to hire to fix all this.
Does that exterior side wall need to be gutted, to the studs, or can it be patched?
Can that floor be fixed so it has a smooth surface?