I go to Korat Imm. I need to renew my Non-O Retirement Extension next month. I dropped by Korat Imm a couple weeks ago to see what is needed (if any changes from last year) they gave me the forms to fill in. Obviously need PP photos, From my bank the balance statement, also a letter from the bank stating how long my 800K has been in the bank (in my case a year as I just keep that money in that account for imm) also have to update bankbook and copy the page. Plus - this wasn't required last year - a copy of landlords ID card and housebook. As I'm registered at my TGF's house that's no problem for me. And the fee, which remains at 1900 Bt. Anyway, I guess UT will be the same, you can always drop by and ask them. Hope this info is useful to you.