Door
To dream that you are entering through a door, signifies new opportunities that will be presented before you. You are entering into a new stage in your life and moving from one level of consciousness to another.In particular, a door that opens to the outside, signifies your need to be more accessible to others, whereas a door that opens into the inside, denotes your desire for inner exploration and self-discovery.
To see opened doors in your dream, symbolize your receptiveness and willingness to accept new ideas/concepts. In particular, to see a light behind it suggests that you are moving toward greater enlightenment/spirituality.
To dream that the doors are closed or locked, signify opportunities that are denied and not available to you or that you have missed out on. Something or someone is blocking your progress. It also symbolizes the ending of a phase or project. In particular, if you are outside the locked door, then it suggests that you are having some anti-social tendencies. If you are inside the locked door, then it represents harsh lessons that need to be learned.
To dream that you are locking doors, suggests that you are closing yourself off from others. You are hesitant in letting others in and revealing your feelings. It is indicative of some fear and low self-worth. If someone slams the door in your face, indicates that you are feeling shut out or some activity or that you are being ignored.
Backdoor
To see a backdoor in your dream, suggests that you need to search a little harder to find an answer to your problem. Sometimes the solution may not be obvious
House
To see an old, run-down house in your dream, represents your old beliefs, attitudes and how you used to think or feel. A situation in your current life may be bringing about those same old attitudes and feelings. Alternatively, the old house may symbolize your need to update you mode of thinking.
Room
To dream that you are in a room, represents a particular aspect of yourself or a particular relationship. Dreams about various rooms often relate to hidden areas of the conscious mind and different aspects of your personality.
To dream that you find or discover new rooms, suggests that you are developing new strengths and taking on new roles. You may be growing emotionally. Consider what you find in the discovered room.
To see an appealing or comfortable room in your dream, signifies opulence and satisfaction in life.
To see a dark, eerie or confining room, denotes that that you feel trapped or repressed in a situation.
Dream interpretations from Dream Moods website