Same boat as you.

US passport applying for 30 day extension. I'm currently waiting at Promenada after taking my photo and all docs submitted. Pretty avg traffic day. Came during their lunch break at 12 noon.

2 copies of everything

They have all the forms you need besides your Embassy letter and TM30.

-TM7 (they have), must fill out twice by hand) BLUE INK MANDATORY

-TM30

-Passport: First two pages and the page of last visa stamp.

-T6 (was stapled to my passport/ visa stamp page)

- 2 photos of your self

- other docs they have

- 1900 baht

I have to return on Oct 2nd for stamp.

Just left out.

@Irina ********

did you have to show proof of a place you're staying at? If so what did you show them?

Hi

@Irina ********

, thanks for that info! I am also in Chiang Mai and want to extend. Are you saying you can just go DIRECTLY to Promenada and they have all the documents that you need or do we need to print them out and complete them BEFORE we go there? Thanks!