@Rodrigo ********

ask a bank

You can only get the Non-OA visa in your home country and can use funds in your home country for that visa

@Kevin ********

for extension at all immigration offices, for initial visa only at jomtien and 1 or 2 other offices

@Reinhard *******

only if ones embassy in Thailand will provide an income affidavit/certificate and his does not

Take the extension and get 30 days. Then if you need to border bounce use a border run company to do so. Highly unusual for 30 day extension to be refused

Get the Non-O based on age before travelling to Thailand. This gets you 90 days in Thailand and makes it much easier to open a bank account, a residence certificate from immigration will also help. Do this within the first week or so in Thailand, transfer in 800k baht as it has to be in the account for 2 full calendar months before you apply for the extension. Then sort out your lease

The best agent is yourself and it's pretty straightforward to do. The hardest part is getting a bank account

The Non-O marriage visa IS a 90 day visa. Before the end of the 90 days you need to return to immigration with all the same paperwork (updated) and apply for a 12 month extension of stay, you'll also need to show you have 400k baht in your account for 2 calendar months prior to the day you apply. Your application goes under consideration for a few weeks and then you return to get the remainder of the 12 months stamped in, they may want to visit you again during the under consideration period

Sounds like you are applying for a 12 month extension of stay for retirement. You either meet the criteria for both the current year and the next year or you don't. There's no real leeway. If you are refused you can leave Thailand and return visa exempt and start over by applying for a new 90 day Non-O and then an extension or apply for the 90 day Non-O at a nearby consulate then extension before that expires

@Kool ******

or you can just put 800k in your bank account 2 months before applying for the extension