Dream about building a castle is a harbinger for you own sense of worthiness and esteem. You tend to keep your feelings contained and in check. The tough times you are experiencing will soon be over. The dream is a symbol for your competitive spirit and how you tend to measure yourself against others. You are putting up a front and trying to deceive others.
Building a castle dream indicates your growing distrust for a person. There is something in your life that you need to let go no matter how hard it may be. You need to recognize your spiritual needs. It is a portent for a polarizing issue in your life. You may be putting yourself in some sort of danger, either physical or mental.
If you dreamt about building a castle:
This could be a day when you won't quite know what has hit you. It may be someone who has been a friend up until today, or even a friend of a friend. You won't be able to mistake the power in the look that you exchange. There will be a sizzle in it.