You have to report your new address to the National Population Register (external website) as soon as you know you will be moving. The UDI automatically receives your new address from the registry.
If you are in Norway, and you move before your application has been processed, you must notify the police that you are moving no later than one week after you have moved. You can notify the police where you are moving to, or where you lived before.
If you are abroad, and you move before the UDI has processed your application, you must notify the embassy or consulate you applied to. If you fail to do this, you risk not receiving the answer to your application.