Backdoor

If you are inside a house or building when a backdoor appears in your dream state, you are most likely looking for an easy way out of a situation. People are more inclined to escape through the backdoor when they feel don't belong there in the first place or they prefer to stay reserved for personal reasons.
If you are outside a home or a building facing and looking at the backdoor, you will be soon involved in finding a solution to an issue that is unconventional or morally questionable.