Should I use my home address in Bangkok or my hotel address in Chiang Mai for the TM7 form when applying for a 30-day extension?

When applying for a 30-day visa extension in Chiang Mai, you must use the Chiang Mai address on the TM7 form. You will need to provide proof of a TM30 with that address. You can also register your TM30 at the Chiang Mai Immigration Office or use an online app for TM30 registration. Alternatively, consider applying for the extension in Bangkok before traveling if your current visa allows it.