I added a screen porch to a cabin I lived in. It had the laundry hook up and I had a freezer so I wired it like a room addition. When I questioned the inspector he said how I wired it decided whether it was outdoors or not. If I had had put in 2 recp. on the house it was outside and needed a GFCI. I wired it like a room so he called it a room. Rod