A friend wants to extend his tourist visa, is this doable at Chaengwattana Immigration or must they go to another Immigration location?
TLDR : Answer Summary
A friend can extend their tourist visa at Chaengwattana Immigration if they have a 60-day Tourist Visa obtained before entering Thailand. However, if they entered Thailand with a visa exemption or a Visa on Arrival (15 days), they will need to go to the IT Square Laksi Plaza temporary office instead. It's important to know the friend's passport nationality and current address in Thailand to determine the correct procedure.