Just extended my permit (note : not visa) today (Jun 22) for another 30 days at the Bangkok immigration office (IT Square location). I am surprise they didn’t ask for TM30, the ChiangMai office did ask for TM30 when I did the extension in April. The process is fast, only took me 1 hr to have my passport in hand with the extended permit.
I do have a question, does any one know how many times could one do this type of 30 days PERMIT extension without leaving Thailand at all?
Regards