Your posts are very encouraging - thanks!
I am in a similar situation as am going to live in my partner's house also. But I am surprised the need of her producing a bank book too. Are you sure this requirement is a part of the retirement extension? I would have thought it is more applicable for an extension based on marriage.
After submitting the required and correct documents at Jomtien, the passport with the extension is not available on the same day, moreover there is an extra requirement for returning to the office after three months producing bank details ensuring funds of at least THB800k are available. These extra demands seem not to be enforced by the Immigration offices at Buri Ram.
May I ask why you don't use the on-line system for completing the 90 day reporting requirement?
Withe reference to: "a. Transfer money to account on day of Extension"
Could you please elaborate.
For the past 10 years I leave a balance of about THB900K permanently in my bank account and either deposit or withdraw THB100.- to comply with the required update of my account on the day of submitting all documents to the Immigration officer. So, at Jomtien I don't need to transfer any funds to qualify for an extension. I guess/hope this would satisfy the Buri Ram Immigration officers also
And at Jomtien I never have been required for producing a Bank Statement as the Bank Letter from the respective bank seems to suffice.