I am on a non-immigrant B visa. I want to move to an extension based on marriage. Is it possible to change the reason for extension of a non-immigrant B to marriage at Chaeng Wattana once my current extension is up, or is my only option to leave the country, apply for a non-immigrant o, then get the extension. Thanks.
TLDR : Answer Summary
Yes, you can change the reason for your non-immigrant B visa extension to one based on marriage to a Thai national at Chaeng Wattana. You will need to provide all required documentation for the marriage extension. Note that your application will be under consideration for 30 days before receiving the yearly extension in your passport. Additionally, it may be advisable to have a letter from your employer acknowledging your change in visa type.