No objection letters are essential when working on a visa application here's everything you need to know about how to write them. The letter will include a declaration that your employer has granted you permission to leave the country without objection for a short business trip.NOC Format: What do you write in a NOC letter? How can I get NOC certificate? A Certificate of Occupancy is required for all businesses in the city. Learn more about applying for a Certificate of Occupancy.