Hello everyone, for those of you who are currently under the tourist visa and want to extend your visa for 30 days in Bangkok. Please don’t go to the regular immigration office but to the temporary visa center to extend your visa. Make sure to bring and print the letter from your ambassy, the e mail showing that the embassy sent you this letter, a picture and copies from the first page and entry stamps into the country. If you have all tus documents it shouldn’t take you more than one hour. The cost for the extension is 1900 bath.
Good luck!
TLDR : Answer Summary
To extend your tourist visa for 30 days in Bangkok, visit the temporary visa center instead of the regular immigration office. Required documents include a printed letter from your embassy, an email confirmation of the letter from the embassy, a passport photo, and copies of the passport's first page and entry stamps. The extension fee is 1900 baht and should take about one hour if you have all necessary documents. Note that appointments for extensions may be fully booked, so you might need to show up without one. Proof of accommodation is generally not required.