What documents do I need for a 30-day visa extension in Thailand?

To extend your 60-day visa stamp by an additional 30 days in Thailand, you generally need to present several documents: your original passport, a photocopy of the photo page, a photocopy of the entry stamp, a passport-sized photograph, the TM30 form obtained from your hotel or landlord, and a fee of 1,900 baht. You may also need to fill out form TM7 and possibly STM2 and STM9, depending on the specific immigration office.