What Documents Are Required for a 12-Month Extension of Stay for Non-O Visa Holders Married to a Thai Citizen?

That one that's was posted in March 2019 is close BUT I would still say just put on your big boy pants, suck it up and go get the handout that lists everything from the immigration office well BEFORE you need to do your extension.

I don't know if there's anything in the file section about getting a year long extension based on marriage to a thai at Chaengwattana AND I think I see a trip out there for you and your thai wife BEFORE you need the extension to actually get the hand out listing the requirements from Section L (the section that issues year extensions).

That's the only way to really know what they're wanting. I mean face it there are 70+ immigration offices inside the country each running like it's own little kingdom. There is no "one size fits all" boiler plate list that is gonna work.

Even the hand out you get from them doesn't always work and they ask for more documents :/