What documents do I need for my first Non-O retirement visa extension in Thailand?

When renewing your Non-O retirement visa at Chaeng Wathana, you typically need to provide a bank statement for the last 3 months for your first extension. You may also need a bank letter on the renewal day indicating the balance, and it's possible to update your bank book on the same day at the bank branches available in the building. Note that the bank letter and statement can be up to 7 days old. For subsequent annual extensions, a 12-month overview is required.