To dream of an abandoned house represents belief systems, ways of living, or relationships that have been discarded. It may also reflect abandoned ideas or a future you planned for yourself and gave up on. Decisions or lifestyle choices you are aware of yourself having purposely given up.
You might also be curious about the past or why other people stopped doing something interesting.
Example: A woman dreamed of abandoned homes. In waking life she had been dealing with trust issues with her boyfriend who had discovered her embarrassing sexual history. She had discarded her promiscuous past completely, but her boyfriend didn’t believe her.