To apply for your visa extension based on marriage to a Thai national, you need to prepare and submit the following:
Application form T.M. 7
1 photograph (4x6cm)
Copy of passport, especially Non-Immigrant visa and TM6 arrival/departure card
Visa extension fee 1900 THB
Copy of your marriage certificate (if married in another country, a letter of evidence is required from your embassy as well)
Copy of Kor Ror 2 (marriage registration or long tabian) from amphoe office, dated not older than 6 months from issue of copy
Children’s birth certificates (if applicable)
Copy of spouse’s house registration
Copy of spouse’s identity card
Proof of combined income of 40,000THB or over for the previous 3 months (income tax records PDN1. forms, pension documentation, proof of income through investments, work permit, etc.
Outside of Bangkok, it is often require to prepare 2 COPIES of every required document and photos. Ensure that all copies are signed in ink prior to submittal. This list is what most Immigration offices ask for, however officials are able to ask for further proof of the marriage at their discretion. Therefore, the following should also be prepared in case they are requested:
Map to your home in Thailand
Picture of your house and yourself with family, both inside and outside showing the house number