What is the procedure and documentation required to extend a tourist visa in Thailand for one month?

To extend your tourist visa in Thailand for one month, you will follow a similar procedure to the COVID extension. You will need to provide the following documents: a copy of your passport data page, a copy of your entry stamp, a copy of your TM6 departure card, a completed TM7 form, a passport photo, and a fee of 1,900 baht. Some offices may also require proof of TM30 filing, so it's advisable to check with your accommodation about that.