The Curious Dreamer’s Dream Dictionary

by Nancy Wagaman
Knocking on a door or ringing a doorbell can represent (real or imagined): Attempting to gain admission or surpass a barrier (such as to attain a new experience, certain knowledge, or acceptance by a certain person or group).

Progressing forward, or moving into a new phase.

Trying to communicate with or gain access to someone, perhaps to make a request or convey information.

Searching for or exploring an opportunity.

See Door or Entrance, Ringing, Hearing, Passageway, Knock, Hearing a, Explosion, Lock, Entering

The Element Encyclopedia

by Theresa Cheung
If you are knocking on a door in your dream, this suggests a desire to make contact with or hear from someone. It can also indicate the need for love and care, or to be the focus of someone’s undivided attention in waking life.

Alternatively, you may have been knocking on wood in a superstitious attempt to ward off misfortune. Another interpretation suggests that your attention is being called to whom or what was knocking, perhaps some aspect of yourself that needs to be allowed in.

My Dream Interpretation

by myjellybean
To hear knocking in your dreams (or to see someone else knocking), suggests that your unconscious is trying to attract your attention to some aspect of yourself or to some waking situation.

A new opportunity - or money - may be presented to you.

If you were doing the knocking, the dream is warning you against loose talk and trusting in shady friends.