This is for Pattaya....May apply to Chiang Mai also...not sure.....are you short stay or long stay....hotel, condo or private residence....

Did you have all of the required documents to lodge the TM30..?

You need what is mentioned above....THEN you need to copy the TM30 slip you receive and have another photo for the extension.....(Total 2 photos). If going in morning go earlyish....if afternoon they open after lunch at 13:00. Allow min 3 hours.

On the Pic it is B.C.A.....Sorry a bit confusing...

They have not moved the goal posts since it came more strongly into affect 18 months - 1 year ago and they started enforcing it.

It is for all foreigners in Thailand when making an extension. A. Hotel stay......They contact Hotel (who should have registered you)...or B. You are in short stay and not a hotel....they contact Landlord or Owner......or C. Long Term stay with a contract. You as the Housmaster or Possessor of the property lodge it yourself (recommended).

It is no problem. May be a fine or may not be...depends on the day. Complete and lodge the TM30 when you are there and then apply for the extension. As a long term renter you are responsible to lodge the TM 30 yourself, not the Landlord. You signed a lease, you are now the Housemaster or Possessor of the property. I have not heard of anyone being refused an extension.....but you never know....

I javen't heard of any refusals

I went last month. Took longer than it used to before TM30 (obviously). I used to be in and out in an hr / hr for an extension before....now it takes prob 3 hours or so. No big deal.

Yes and you may also need to complete the TM30 form when you arrive. Process that so you get your TM30 slip...Go and get a copy of that and submit the docs for the extension......