@William ******
Sorry for not replying any sooner, it was beddie time in Thailand and it’s 5:25 am now
To visit Jomtien Immigration, just make sure you go earliest and not at the end of December. You will not lose a single day, the next extension starts on top of the old extension
You can apply from up to 30 days before your Extension of Stay Permit ends, this would be 18 December
The Jomtien Immigration paper listing the requirements lacks a bit in logic.
It firstly say "for example", followed by the listing. The mark “-“ ahead of each row actually means “or”.
Every document marked from the left with my red arrow can be presented and is sufficient.
The TM30 registration proof is ONE of the four documents that can be presented- if you do not wish to present a rental contract.
You can of course bring more than one accommodation document
In case you have a screenshot from your TM30 listing, bring it. And also bring the one month rental contract. Best you present both.
Upon a return from abroad, to my knowledge Jomtien Immigration requires a new TM30 within 24 hours of your arrival, even if you arrive at the same address as before, however I am not 100% sure of this. Maybe another member of the group more familiar with them will know