Thanks admin and moderator's of this group. Today I went to chaeng wattana to do my covid extension. Arrived 8.30 received and filled in the relevant forms. Wasn't asked for anything other than passport, tm7 and covid form. Was stamped in from today until March 21st. Very smooth process and sat back in the car at 9.15. All made easy with sound advice from this group
TLDR : Answer Summary
The user had a smooth experience obtaining a COVID extension at the Chaeng Wattana immigration office in Bangkok. Arriving at 8:30 AM, the user completed the necessary forms with only their passport, TM7 (extension form), and the COVID form, and received a stamp valid until March 21st, completing the process by 9:15 AM. Responses in the comments emphasized that immigration policies can vary by location and expressed appreciation for the group's support.