What documents do I need for a 12-month extension of my Non-O Visa at Chaengwattana Immigration?

When applying for a 12-month extension of your Non-O (marriage) Visa at the Chaengwattana Immigration Office, it's crucial to bring specific documents. Key documents include: 1. Updated bank book (updated on the day of application) 2. Bank letter (dated within the last 7 days) 3. TM30 receipt 4. Lease agreement 5. 90-day report receipt 6. Recent photographs with your spouse 7. Marriage certificate and Kor Ror 2 (a document confirming marital status from the local Amphur) 8. Appropriate passport copies 9. Completed TM7 extension form 10. Application fee (1900 baht) Each immigration office may have varying requirements, so it's beneficial to inquire directly at Chaengwattana to clarify any additional documents you might need.