Requirements for 1-year extension based on Thai wife in Chiang Rai, just went the other day and received under consideration stamp. Just want to post if anyone looking for the requirements for Chiang Rai specifically.
* application
* visa photo
* passport bio page
* TM 30 receipt (address notification)
* copy of 90-day report
* Copy every single page in passport
* marriage certificate
* KR 2
* Wife ID
* Wife house book
* ** if you have half-thai children, include their thai ID [if over 7] - thai birth certificate and house book entries
* bank letter verifying funds
* bank book front
* bank book pages
* bank statement
* map to house
* rental contract
* house owner ID
* house owner house book
* photo outside with house number
* photo outside house
* photo inside house
* photo inside bedroom
* 1900 baht