My first 3 month non O retirement visa has passed the 45 days and is now ready for the 12 month extension. Can anyone advise me please on the papers I need to gather before I make my trip to immigration. I know I need to update my bank book just before I go but do I also need a letter and statement from the bank ? Do I need a map of where I live ? Do I need a copy of my rental contract ? I will be applying in Chiang Mai if that makes any difference. Thanks for your help.