What Are the Required Documents and Process to Convert a Tourist Visa to a B Visa in Thailand?

Just curious

@Eddy *********

but if indeed you "deal with these things in house" shouldn't your company know whether your immigration office can or can't do a conversion from a tourist visa or a 30 day visa exempt entry to a 90 day Non-B visa? :O

Not every immigration office can do the conversion and they require different amounts of time remaining on your entry stamp to do them. In bangkok you need 15 days or more, in Chiang Mai you need 21 days or more.

I see a trip or call to your local immigration office to find out if they do it and then to get the specific hand out from them that lists the requirements to do it there.

I guess the easiest way is to have your thai staff to go to immigration office serves your area to get a handout of requirements.