Hua Hin Immigration provide the attached explanatory note regarding documentation required (the attached Note was provided in August 2024). Note however that we were advised that the witness referred to in Item 13 may not only be required for the first extension but, if you are moving residence from one province to another - also for the first extension in your new province (in our case - Hua Hin). Note also (see Item 13) that if you have no children, a Thai witness/es may be required for each and every renewal. In relation to the latter - in practice, others may have had different experiences, and can comment here.