Coming across a room you never knew was in your house is read as finding unused space in yourself — a talent, a memory, a possibility. Dream tradition treats it as one of the more hopeful discoveries a dream can make.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.