If staying in Bangkok and have a tourist visa, which immigration centre do you have to go to?
And what documents do you need prior arrival? I believe it was
- passport
- copy of visa
- one passport photo
And then you complete a form there?
TLDR : Answer Summary
If you have a tourist visa and are staying in Bangkok, you need to go to the Chaengwattana Immigration office located at Government Complex Building B to apply for an extension. Required documents include your passport, a copy of your visa, and one passport photo. Additionally, you will need to complete a form upon arrival. It is advisable to book your appointment online before visiting.