How can I extend my visa in Thailand based on my marriage to a Thai citizen?

@Sven ***

you say this in your post; 𝗜’𝗹𝗹 𝗯𝗲 𝗳𝗶𝗿𝘀𝘁 𝗴𝗲𝘁𝘁𝗶𝗻𝗴 𝗮 𝗻𝗼𝗻 𝗶𝗺𝗺𝗶𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝗢 𝗳𝗿𝗼𝗺 𝗮 𝟯𝟬 𝗱𝗮𝘆 𝘃𝗶𝘀𝗮 𝗲𝘅𝗲𝗺𝗽𝘁 <- that means in Bangkok as Ellie said you need a minimum of 15 days left on your current stamp's validity. (the application goes under review for 2 weeks before you go back to get the Non-O visa and a new 90 day stamp inked in)

ALSO

you apply for the initial 90 day Non-O visa 2000baht in Section C-1 and go back there after 2 weeks to get the visa/new stamp inked in.

You apply for the YEARLY extension for 1900baht in Section L-1 once your new 90 day stamp runs down (and you need ALL new documentation to do that?

So when you go back to get the new Non-O visa and 90 day stamp inked in stop over in section L-1 and get the hand out listing the requirements for the yearly extension that way you know what you need when you go back in a couple months