I arrived in Thailand on March 18 and received a 30 day visa exemption stamp which expires on April 16. I’m in Chiang Mai and was planning on going to the immigration office tomorrow to apply for my normal 30-day extension. I’ve been searching for updated information on which location to go to (the office or mall) and what I need to bring with (do I need some sort of housing agreement, health form or letter for a regular extension?) but have read mixed responses. Could someone let me know what I should do?
TLDR : Answer Summary
To apply for a 30-day extension in Chiang Mai, go to the Immigration Office near the airport. You need to bring an application form (available at the office), a passport photo, your passport, copies of your passport's ID page, the entry stamp, and your TM6 departure card. The fee will be 1,900 THB.