What do I need to apply for a marriage license? Unlike a Chapel Marriage Ceremony, there is no need to pre-schedule your ceremony.Fill out VitalChek's online form. VitalChek is the only authorized online service for Santa Clara County marriage certificates. Both parties must appear in person and bring valid picture identification to the County Clerk's Office to apply for a marriage license in California. In California, you have to be 18-years-old to tie the knot. The Universal Life Church explains California marriage laws, how to become an ordained minister, and how to perform a wedding in California with 5 steps. Both parties (you and your fiancé(e)) must apply in person together at any County Clerk's office. Explore common law marriage in California: understand legal rights, property division, parental rights, and financial implications for unmarried couples. A valid marriage under California law requires the consent of the parties to enter into a civil contract.