What is the process and cost for extending a non-O visa based on marriage to a Thai citizen?

I took my US marriage certificate to the US embassy in Bangkok to have it notarized and then to an approved translation service that was a few hundred feet away from the embassy. You don’t need to visit the US embassy in Bangkok (lucky for you). Then you go to your Amphoe office in Thailand to get a Thai marriage certificate. Then you are good for 1 year. You have to repeat the visit to the Amphoe office every year. Not too difficult. Good luck.

We had all of are documents translated, marriage, passport, license etc … and the translators we used got them stamped for us … we spent 8000 baht about $240 dollars …

I can’t recall the price at the Ministry of Foreign Affairs but the translation and filing was probably less than $100. There are two things. There are Ministry offices in a couple of other cities that can serve you. I have used the main one in Bangkok and a second in Central Plaza in Pattaya. I tried an outside translator and it was rejected. The Bangkok office had translators that the accepted hang round the office. In Pattaya we were directed to a nearby Soi. I mention this because my solicitors translation was not accepted by the Ministry. Good luck and be patient.

Dam.. that a lot .. I thought I read just state apostle letter then translate for Dept foreign affairs, then I heard bring all that to local Ampure but wtf just info from YouTube and Facebook over the years… but I got do it a couple years too 🤔😜