At the download section of the Ministry of Labour, Department of Employment I downloaded the documents for an work permit renewal application WP.5. http://wp.doe.go.th/sites/default/files/form/form_tt5.pdf The relevant page for teachers in Thailand is posted below. One major change is the requirement for documents from the Teachers' Council of Thailand. Until now the Labour Office in our province has never asked for any documents related to The Teachers' Council of Thailand but the rules below seems to be the most recent. I'll have to wait until April 2011 to find out whether these rules are enforced in our province. Not mentioned in this document but our Labour Office also requires a copy of a document that proves that the teacher is registered for Social Security, a copy of the tax clearance receipt and a copy of the PND91 form (tax form).