What do I need to bring to extend my TR visa at the immigration office in Bangkok, and is the COVID extension still available?

To extend your TR visa in Bangkok, you need to bring proof of where you are staying and your passport. If you've just entered Thailand on a tourist visa post-quarantine, ensure you have obtained your 30-day extension before applying for a COVID-related extension. For your convenience, you can visit the MTT immigration office located at the provided Google Maps link.