How do I extend my visa?
If you want to stay longer in Norway or the Schengen area than your visa allows, you must apply for an extension of your visa. Extensions of visas are only granted in exceptional cases, for instance if you have become seriously ill or a natural disaster has occurred.
Visitor visas can never be extended to allow a stay beyond 90 days during a period of 180 days.
You can read more about the requirements for visa extensions, how to apply and where you can submit the application here.