Does ESA Letter Have to Be Renewed March 11th, 2021 Yes. ESA letters are valid for one year. The recommended practice is to renew your ESA annually to avoid the inconvenience of being denied housing or boarding an aircraft due to outdated documentation. Related Posts Mast Cell Tumor: Dogs Diet and Nutrition Guide What are the Friendliest Pets? Dogs Behavior Problems and Solutions: 6 of the Most Common 7 of the Best Vegetables for Dogs to Add to Your Pet’s Diet [therapypet_step1_form show_in_mobile="1"]