What visa do I need to stay 6 months in Thailand with my Thai wife and can I extend it?

Just get Non-O (Married) 90 days in The UK and than change to 1 year inside of Thailand. (90 days address reporting at the immigration in Thailand)

Jarkko Takamaa you are confused :(

They are NOT the same thing at all

There is a yearly EXTENSION OF STAY that you get from the immigration office INSIDE the country based on marriage. <- that one lets you stay inside for a year and only do 90 day reporting

AND

There is a year-long, multi-entry Non-O VISA that you get from a thai consulate in another country BEFORE you wing your way here <- that visa ONLY stamps you in for 90 days and when it runs out you go to the border, stamp out of thailand, stamp in and out of another country and right back into thailand to get a NEW 90 day stamp, you do that for the whole year the visa is good for

Jarkko Takamaa yep thats my understanding too

he might indeed get a visa that is valid for 12 months based on marriage to a thai BUT he can't stay IN thailand any longer than 90 days at a time

@Nina *****

You cant get a 1 year Non Imm O (married) in England only a 90 day.