What should I do to renew my marriage-based visa extension after moving to a new province in Thailand?

If you have a marriage-based visa extension and are planning to move to a new province, you'll need to visit the local immigration office in that province. You may be required to file a TM28 form for changing your address and a TM30 form notifying of your residence. Once you've completed these forms, you can request information on the requirements for renewing your extension, which should be done within 30 days of your current extension's expiration.