Fences are used to lay claim to land and wall off your space and territory. Dreaming of fences may mean something about those boundaries and walls. However, there is always two sides to a fence. You may dream that you are on the inside, building the fence as your safety barrier. It keeps out that which you do not want coming in and shielding yourself from the outside. You may be putting yourself into isolation.
Dreaming that you are on the outside of a fence may prove to be the frustration of wanting to enter something, the obstacle that is set before you that tries to block your progress in.