Got an extension today in Chiang Mai...15 minutes in and out....Bravo!
Sorry... just a 30 day extension....I was surprised when they gave me back all my copies of my passport except the front page with the picture on it.and asked for onward travel...of which I had a copy of...1900 Baht and 15 minutes later
TLDR : Answer Summary
A user successfully obtained a 30-day visa extension in Chiang Mai, completing the process in just 15 minutes. They noted the requirement of showing onward travel documentation and the cost of the extension was 1900 Baht. All copies of the passport were returned except for the front page.