What documents are required to extend a visa at Samui immigration?

When extending a visa at the Samui immigration office, applicants should expect to provide similar documentation as required for the initial visa application. This includes proof of at least 500,000 Baht in a bank account for the previous 30 days. Some users caution that the Samui office may not process extensions as easily as other locations, potentially redirecting applicants to the main office on the mainland.