My family was granted a SE 90 day non imm visa. I know we will need to request the extension of stay, because we have a 1 year contract. Is it 1900 baht for the extension of stay? Also, do we need to do this every 90 days? On the website it says to request an extension of stay in Bangkok, but we will be staying in Chiang Rai. Is there a local immigration office we can go to in Chiang Rai to request the extension of stay? What type of documentation do we need to bring to request an extension of stay? Thank you for all of your help, as this is our first time going to Thailand!