Just been to Chaengwattana for the extension of stay.
Was rejected as:
I didn't have the pictures which I thought wasn't needed in BKK.
Also as my spouse and I are staying at a rental place. The immigration dept requires the ID card and tabien ban of the owner even though I have the rental agreement.
TM30 was asked too. Just FYI.
TLDR : Answer Summary
The user shared their experience at Chaengwattana immigration for an extension of stay, highlighting that they were rejected due to missing pictures and the necessity of the landlord's ID card and tabien ban, even with a rental agreement. They also noted the requirement of a TM30 form.