The rooms of a house each relate to the details and boundanes of different aspects of the soul or personality.
For example, the bedroom often relates to your ideas about sexuality, and the kitchen reflects concerns about nurtunng the family.
In a dream, these can describe various parts of our personalities or levels of understanding, but often signify either the womb or the mother figure. Thus the kitchen would be the home-making part of us, whereas a sitting room would be the more relaxed, comfortable side.
A small room with only one door or a basement with water in it is a direct representation of the womb and may indicate a wish to return to the womb-like state of innocence, where everything is taken care of for us.
A series of rooms refers to the various aspects of femininity and often to the whole soul.
An upstairs room usually signifies mental or spiritual attributes, so any object within such a room will represent an idea or concept.
The meaning for a basement or cellar can be ambivalent, since a cellar can represent the parts of ourselves that we have chosen to suppress. It can also represent family beliefs and habits, particularly if the basement is one that belongs to our parents.
If we deliberately leave one room and go into another then it represents a change of state and of leaving something behind. Empty rooms signify that something, such as comfort or support, is lacking in our lives.