This is a list of rooms that can expand and by how much. I don't have all the answers yet, but with your help, we can do it. Attaching and upgrading them beyond 3 will start a new room. The ones not listed, I only have 1 of right now, and will expand as I need them.


3x Living Quarters

3x Power Generator

3x Diner

3x Water Treatment

pretty sure they can all expand to 3 if desired. they just have to all be the same level which also happens to have a max of 3 for everything i believe.