So just now I was in a room by myself, no team so there was no block on the door. I finish my boat with 20 seconds left and then someone with a team comes in my room. When that happened, my whole boat disappeared and I was refunded the money. A message popped up saying something like I can't build in a private room. So @Donkie I would suggest being able to lock a room without being on a team. I don't want to have to make a team because then everyone will want to be on it and I like to go solo most of the time. tl;dr If you go solo and are in a room, someone with a team could walk in your room and cause you to loose your entire boat.