What is the process for renewing a Non-O marriage visa in Thailand after the initial 90 days?

It is for sure very stressfull to amass all the papers required to get the marriage visa and so much easier to get a retirement visa. I have applied for it 7 years now. The funniest one was update your bank passbook. I had no transactions from my bank at the time so saw no need to update as there's nothing to print out. The I O told me I must update for that day how nonsensical is that. So I had to go to the bank, pay in 500 baht and update the book.

You will need to be very patient. Its a long process with mountains of paperwork, not just as quoted in the handout, but many more supplied by the immigration officer you see, plus monetary information supplied by your bank. I have just completed my 5th married to Thai visa. Finished up with A4 paperwork measuring nearly half inch in depth, probably in the region of 50 x A4 sheets, additionally everything has to be duplicated so one copy of the application can be sent to Bangkok, whilst the second copy remains at your local office. Good luck you will need it plus lots of patients!!!!

When you go back you're doing a completely different process (applying for a year extension)

You're going to need all the paperwork you used to apply for the 90 day non o, (copies of passport, marriage documents, wife's I/d, photos, lease, new bank letter, print out from the bank of the last 2 months statement, updated bank book, etc)

It's a whole new thing.. so requires all new paperwork