What documents do I need to extend my stay in Thailand by 30 days?

To extend your stay in Thailand by 30 days, you must present the following items to Thai immigration: your passport along with a copy of the ID page, a copy of your visa page, a copy of the admission stamp, a copy of your departure card, a passport-sized photo, evidence of your accommodation (like a hotel bill or notification of address), and a fee of 1,900 THB. Requirements may vary by immigration office.