For Your Information in regards to Extension of Stay based on marriage at Immigration Nan province. Last week I picked up my yearly extension of stay again. No questions asked, no need of bank book to show again. Took me 10 minutes. As I am planning to travel out of Thailand I wanted also to apply for Re-Entry permit (single = 1.000 baht) but I did forget that I need a pass-photo for that. So I will come back next week again. Yes, I know I can get it at the airport but for peace of mind I like to get it before traveling.
TLDR : Answer Summary
The user shared their experience obtaining a yearly extension of stay based on marriage at the Immigration office in Nan province, Thailand. They reported a quick process with no questions asked, and no requirement to present a bank book. Additionally, they mentioned their intention to apply for a Re-Entry permit but noted they forgot to bring a pass-photo and plan to return the following week.