Received my 30 day visa amnesty extension at the Mae Sai, Chiang Rai immigration office and just wanted to share this info if it can help anyone else in a similar situation.
Documents required (2x copies of everything):
- information page of passport
- page with most recent arrival stamp
- page with most recent visa
- House contract
- Owner ID card
- Letter of extension from embassy
- Email from embassy containing letter of extension
- tm30
- TM7 form
2 passport photos
1900baht