Just an update from a comment in a post some days ago, regarding extending Non-ED Visa at Chiang Mai.
Now it's mandatory to bring a copy of rental contract AND copy of first page of the landlord's Tabien Baan (property registration). My school informed me in advance and yes, the officer looked for it and signed it. In addition, the copy of TM30 was required (and signed) too.
In the good side of things, I showed up at 6:05 and get queue number #10. At 9:30 I was out with my extension. No more queueing at 2am in the night, it looks like the changes in the new office have worked well 😊
BTW, the Happy Queue system worked ok in my phone, always showing the current number and expected waiting time - the expected time is not so useful though.
Tod, Robert, just wanted to warn about the new requirement and to confirm the queue nightmare in Chiang Mai is a thing from the past. If you think it's not so Visa related feel free to close it 😉
TLDR : Answer Summary
A recent update indicates that when extending a Non-ED Visa in Chiang Mai, it is now mandatory to provide a copy of the rental contract as well as the first page of the landlord's Tabien Baan. Additionally, a signed copy of the TM30 is required. The process appears to have improved significantly, with shorter waiting times reported thanks to the new Happy Queue system.