How can I extend my 60-day visa-exempt entry in Bangkok for an additional 30 days?

To extend a 60-day visa-exempt entry for an additional 30 days in Bangkok, you need to visit the IT Square Laksi Plaza immigration office. You can apply for the extension when you have 45 days or less remaining on your current entry stamp. Required paperwork includes your passport and other possible documentation related to where you are staying, ensuring that the TM30 form is submitted by your accommodation provider.