The college may charge different amounts for different rooms/living situations. But the COA used to package aid is almost certainly a single COA for on campus. When I refer to COA in this situation, it’s not the actual cost to the student - it’s the COA used when packaging financial aid. I suppose some schools may have multiple on campus COAs based on each possible living situation, but I am not aware of any (if they exist, they are few & far between due to the complexity inherent in doing so).