Potentially. No City review or approval (and therefore no fees) are required to have an Outdoor Seating Area on private property, which includes placing moveable chairs, tables, etc. outside of required pedestrian or vehicle pathways. However, if you are proposing an Outdoor Dining Area, which includes construction such as expanding patios, installing fencing, and more, you will likely need to submit for Design Review which has review costs associated with it.
You are encouraged to contact a city planner at 714-573-3140 or TustinPlanning@TustinCA.org to determine what type of City review, if any, is required for your proposed outdoor dining and applicable fees.