Legal Question in Family Law in California

Technically you don't need court permission if you can maintain the current custody arrangment with no change in the timing or expense to the other parent for their custody. Unless you live in Crescent City and are moving to Brookings Harbor, OR, however, it is unlikely that you can do that. So you would have to modify the order to avoid being in contempt of court on the new order, and at that point you will need the court's permission to move because you will need the court's permission for a new order.

In addition to the above answer, it seems that the kind of move you are intending to make will change the nature of the visitation and time share plan. If this is the case, as noted in the earlier answer, a new order reflecting the new parenting timeshare arrangement would be required.