The housing website says room assignments are made by date of housing contract receipt. So, you are encouraged to submit the contract as soon as possible. To get a preferred roommate, both parties have to mutually request each other. @STEM2017, Good luck to your son. I’m sure he’ll be fine! My other kid ended up being tripled at another college years ago, having been accepted ED . They went by random lottery! He got one of the last lottery numbers despite being one of the first to commit to the school. That was certainly annoying! Schools will usually offer incentives,discounts, ask for volunteers to move , etc. It should all work out in the end, although I know firsthand it can cause a little stress at the beginning. I think it happens more than we realize since predicting yield is not an exact science.