It symbolizes the separation between two worlds and between two stages of life. The dream foretells that you are approaching a crucial point of your life in which the orientation of your desires and ambitions will change. To stop in front of the threshold of a house and wish to take the first step, then it signifies about your desire to join some community, but you didnt make up your mind completely yet. If you stop in front of the threshold of some house, but do not cross it, then it shows how much you are protecting yourself.
Read more about dreaming of Threshold in other dream meanings interpretations.