I am wanting to take 5 feet off the back of my one car garage to make a small sun room and laundry room and so I can walk out to the back yard, without going through the garage. My garage is currently 22 ft deep and if I take off 5 feet, plus the wall, it leaves me with a little over 16 ft deep. I can still park my car in there, but was wondering if there is some code somewhere that a garage has to be a certain size otherwise it isn't considered a garage. I don't want to add a room to my house and lose what would be a garage, according to an appraiser. Anyone know?