These dreams always bring a sense of contentment, like I have found something that makes me even happier with the house than I had been before. The only disturbing part is when I start questioning why I had never noticed that part of the house before. This usually leads me to recognizing that the entire thing is a dream, often leading to my waking up (thus being able to remember the dream).
Sometimes the houses take on fantastical properties that I do not question while in the dream. One of my favorites is a house that is built on a tree in the middle of a lake. At the base of the tree is a circular dock where the sci-fi hover-boat is moored. From there, a wide spiral staircase lead up into the house. The house, itself, incorporates the massive hardwood tree and its branches into its design with transparent walls allowing light to come inside without too much heat, leaving the house at a comfortable temperature. Rope bridges and winding staircases lead to various sections of the tree house, but also connect to other nearby trees. It's usually about the time that I start thinking about the practicality of such a tree that the dream begins to end.
There are many, many others as I've had these sorts of dreams for as long as I can remember. It is rare that I find myself in the same house twice, or at least that the secret I find is the same. I wonder what house I might find myself in tonight.