What Are the Requirements for a Non-O 1 Year Extension Based on Marriage to a Thai?

With over 70 immigration offices in the country there is no one size fits all list sorry

It is exactly the same documents you provided last year :O OR you go out there and get the hand out that lists the requirements.

I can confirm with 100% certainty that C/W wants the 400k baht in a thai bank account in your name only for 2 months BEFORE you apply for your extension (not 2 months from when your current extension expires ;) )

AND they will tell you when you apply for the year extension that you need to leave the money IN the account and update your bank book when you go back after the 30 day under consideration period to get the rest of the 11 months extension stamped into your passport.