Hello to all, please i need an advice from you all that know well about this issue of marriage visa. Currently i have a Non B visa with an extension in it with a work permit from the language school where i teach, but i got married with my thai woman recently, haven obtained the marriage certificate, Is it possible to change my Non B visa into Non O which is marriage visa or should i travel out of the country to go and get Non O visa sticker? Pls advice

do you want a non 'o' visa or do you want to do a yearly extension based on marriage to a Thai national

You cannot change visa classes without going out for a new visa.

You could change the reason for your extension of stay based upon teaching to one based upon marriage to a Thai if you can meet the financial requirements to do it. To do the change would require a letter from your employer stating you are no longer working so immigration could cancel you current extension.

Yes yearly extension based on marriage with my Non B visa