See: 2 Ways to Major in Art at UCSB
If you are an incoming freshman or transfer student and you indicate on your application the desire to major in Art in the College of Letters and Science, you will automatically be enrolled as a major.
If you are already accepted to Letters & Science at UCSB as undeclared or in a major other than Art, you must take at least 3 Lower Division Art classes and receive a letter grade (C or better) for each. After you have completed three classes, except 1C, you may fill out the form to declare a major, which is available in the Art Office, and submit it to the Academic Advisor. There is no portfolio requirement at this time.