I want to build a dovecote on the roof of the North House. I don't know where to choose so as not to affect the feng shui at home.

You can choose an idle house without affecting your family life. If the first scale is to stay at home, it will have a great impact on your original life at home. If it is a personal hobby, you can put it according to your own preferences without affecting your family life, because Feng Shui is not a simple matter of east, west, north and south, and it is for reference only. Good luck.