Visited today the new location of the Immigration Office at the bus station in Khon Kean. I took the bus from our village and you could simple not miss the signs.
Take a queue number directly after the sliding door.
I asked for a 60 day Extension of Stay based on visit my Thai wife, documents needed:
Tm 7 and acknowledgement of terms & conditions Extension of Stay and understanding of overstay rules (all stapled together in the cabinet on a big table, pens and glue provided)
1 passport picture
Singed copy ID page passport
Signed copy last entry stamp
Signed copy TM 6 Departure card
Copy Marriage Certificate, signed by both
Copy ID card wife, signed by her
Copy Blue House book singed by her
Picture outside and inside house, signed
Kor Ror 2, from Amphur that marriage is still registered.
You can take free coffee, cappuccino, espresso or just drinking water. Great service.
Just read some other comments, 1 of the 4 working was a man, he was the grumpy one an took long times to see him making a stamp. I got service from a nice lady, with a smile and even a joke in between.
Small point: You have to make a 5 Thb copy of the receipt just outside the office, but the payment is made to another Immigration Officer.