Just completed my 60 day extension based on family/marriage at Chiang Mai Immigration. Was excellent service, the officer (women) was exceptional there. Kind, informative and smart. She told me to come backk closer to the end of my covid visa (expiration) to get more time. The day you apply is when the 60 days start (change of visa).
Needed:
-TM30
-Passport copies (info page, tm6, thai visas)
-Copy of wife's ID card and house book (tambien baan)
-Passport style Photo 4cm×6cm
-Copy of Marriage certificate and yearly up (**edit: only need original marriage certificates, no need to update)to date page kor 2 or 3 they call it.
That's it.
No family photos, no lease contract, no other miscellaneous documents. Definitely the best option for short extensions when married to a thai citizen.
