My one year extension is do the end of July and I have been out of the country for six months.I received my extension at the Chang Mai immigration office and plan on relocating to southern Thailand upon my return, do I still have to go back to Chang Mai to get the extension or can I get it in Phuket? I would appreciate any help on this question. It's for my retirement extension! Thanks

Twice may be an error but 3 times will not secure a better response ......................................

You can apply for the extension in Phuket if that is where you will be living. You will first need to submit a TM28 change of address form with proof of residence attached to it.