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is to renew your ESA annually to avoid the inconvenience of being denied housing or boarding an aircraft due to outdated documentation.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 What is the Cleanest Pet to Own? How Do I Get My Dog Trained as a Therapy Dog? How Do I Get an ESA Letter Quickly? How Long Do Dogs Stay Pregnant? Common Dog Pregnancy Guide Tips [therapypet_step1_form show_in_mobile="1"]