What are the application requirements and process for renewing a Non-O-A visa in Thailand for US citizens?

Jeff, you are using some incorrect terms in describing your visa status. And by reading the comments and your responses I do not believe some of what you are being told is sinking in. FIRST - you don't have a "metv" anything (the 'tv' means Tourist Visa). Second what you likely have is an O-A Multi Entry Visa for people over age 50 AND this O-A visa is actually a Two Year visa. At the end of the First Year near the Expiry date you Exit and Reenter Thailand. This will give you another year of stay but it is not Multi-Entry. Others have said as much in somewhat different ways... Some commenters have offered wrong information.

You need Bank book with 800,000 baht in your account or 40,000 baht income/month pensions etc proof a letter from embassy that you can feed yourself haha haha. Visa Fee is 1900 baht that's it you will get visa if you are over 50 year

@Jeff *********

, what is the "enter before" date stamped on the Non-O-A visa and will you be able to re-enter the country before that date? That's how you'd pull another year out of that visa.

You cannot get a VISA in Thailand !

Not that it matters all that much but do you have a yearly extension of stay (that you got at the thai immigration office inside the country for 1900baht and a multiple re-entry permit that you got for 3800baht)?

OR

Do you hold a year-long, multi-entry Non-Immigrant Type O-A visa that you got at a thai consulate before you came here?

You'd need proof of meeting the financials (either 800K baht banked in a thai bank account for the requisite time, a notary letter from the US consulate stating you make over 65K baht per month in income OR a combination of the two that equals 800K baht for the year)

The TM.7 application for extension form

copies of the data page of your passsort, your current extension, your last entry stamp into thailand, and your TM.6 departure card. You might possibly need your lease agreement too (take it but don't turn it in unless they ask).

It's a pretty straightforward process..

I think you are talking about a Non imm. O-A visa, if so you can border hop just before the visa expires and add another 12 months to it.