Hej
Jag postade nedanstående inlägg på thaivisa.com jag postar det här också... men jag orkar inte översätta det.
I'm just back from immigration (Bangkok). I extended my tourist visa with 60 days.
Documents needed
Passport and copy of passport
copy of the tourist visa
copy of the departure card
copy of the entry stamp
One id-photo of me
Wife
Wife's id-card and copy of wife's id-card (signed by wife)
Wife's house-book and copy of wife's house-book (signed by wife)
Copy of wife's name-change paper (signed by wife)
Marriage certificate and copy of marriage certificate (signed by wife)
They did not ask for any documents verifying that we are living in Bangkok.
If I understand my wife correctly;
It is possible to first extend a tourist visa the "usual" 30 days and the extend it another 60 days for visiting wife.
It is possible to extend the "visit wife"-extension with another 7 days
It is possible to do a visa-run and then extend the visa exemption stamp with 60 days for visiting wife. (more than once a year)
all extensions are charged 1900 THB