I've often thought it had something to do with there being parts of myself that I'm not aware of. I suppose we all have aspects of ourselves that we haven't plumbed - may not even be aware of those parts.
I'd often wonder - after I'd wake up from the dream, I don't think it occurred to me during the dream - how one can own a house for many years and not notice there are whole sections you've never gone into. I mean the building would have to be noticeably bigger on the outside, because in these dreams the unexplored part of the house is often as big as the part I'm aware of. One would have to wilfully not know. That always seemed significant to me.
In at least one of the dreams I would visit the closed up part of the house periodically, but it was always a frightening journey in and out of that section - through hidden doorways and staircases behind walls. I wonder why I didn't just open it up once I'd realized it was there. In most of the dreams, once the hidden part was found, it was used as part of the house. Anyway in that dream I would take other people to that part of the house. I'd try to give them directions, but no one wanted to go alone. I'd always have to act as guide.
I kind of wish I'd written all these dreams down. I don't remember the details of most of them.
You've probably never heard the radio show This American Life. I listen to it every Saturday at noon. It often has some very good stories. One of them reminds me of my house dreams:
http://www.thisamericanlife.org/radi...e-on-loon-lake Act one has a group of boys going into an abandoned house. It's very, very much like these dreams - exciting but also a little scary.