Your darkroom size is only limited to the space you have available. It is what you do with it that counts. I'm not trying to be obtuse but those of us that have darkrooms have learned to deal with the space available. Right now, I move from one room to another depending on the needs of the family. It is a PITA because I have to move my enlarger from the bathroom to the laundry room from time to time if I want to print. I have plans in the works for doing a permanent set up but as of now I live with what I have available to me.