Notes from the field - 30 day extension.
Today went to Bangkok Immigration at Muang Thong Thani to see about the 30 day extension. I had letter from US embassy with me.
It went as others described. I received a stamp to come back on the 16th of September. So based on other reports it seems that they are requesting to return in 14 days time for the final decision.
One thing they did ask for was to see the actual email evidence with the embassy letter which i was able to pull up on my phone quickly.
The process was quick and painless. You need your embassy letter, copies of passport pages and departure card along with three forms to fill out which you get from the same office and can fill out in a few minutes.
As always the staff at the immigration office were friendly and courteous.
I saw a few people show up without the embassy letter and were curtly told to come back with it. So it seems to be a mandatory thing. One guy from France was dressed down and told in no uncertain terms that there is no way he could apply for the extension without it.
Other than that - a positive experience and hope in 2 weeks time I will be granted the extension.
TLDR : Answer Summary
A user provided a detailed account of their experience applying for a 30-day extension at Muang Thong Thani Immigration in Bangkok. They noted the requirement of an embassy letter, which proved essential during the process. The user received a stamp to return in 14 days, reflecting a common procedure reported by others. They mentioned the need for copies of passport pages, the departure card, and three forms available at the office. The experience was generally positive, highlighted by friendly staff, despite some individuals being turned away for not having the required embassy letter.