You can apply for a 30-day tourism extension once at the IT Square Laksi Plaza office if your address is in Bangkok when your entry stamp is 45 days or less remaining. 30 days will be added to your entry stamp.
No, you cannot do it at the Chamchuri Square office as they don't deal with tourist-related applications.
This is general information on tourism extension applications.
IF you have an online appointment for a 90-day report, yes, those are done at the same counter, B.
IF you want to do a 90-day report as a walk-in, no, those are different. 90-day reports are handled at Counter A while a "Letter residence information in Thailand", or so-called residence certificate, is at Counter B.
You will need an updated TM.30 with a check-out date for R/C. This means TM.30 receipt with "0 night" may not work.
You need a filled application form for the letter (available at the immigration office) and, a passport-size photo, other than the passport and its copies. And 200 baht cash for postal related fee.
Better to bring the rental agreement and the latest 90-day report receipt just in case.
A letter will be sent to the address on TM.30 in 1-2 weeks by EMS.
Unfortunately, details about the residence certificate are out of the scope of this group. Sorry. (Usually, we reject posts about Residence certificates)
You will get your old passport back with a new one. Then bring both old and new to the immigration office to apply for transferring stamps.
Please check the US embassy in Bangkok for passport service regarding to your passport application, especially FAQ on their website. Unfortunately, how to get a new passport is out of the scope of this group.
The best is to call your local immigration office to get the direction about that.
Or visit them on 27th to seek advice if you want to take a safe side.
Some provincial offices give you under-consideration period, but they would call you for the actual date. In this case, you just need to wait for the new date, you will not be on overstay even if the u/c period passes.
But some offices give you fixed date and you have to show up on that date, otherwise you could lose your application in the worst case. In this case of the date falls on holidays, we usually advice members to check with them the day before that holiday.
Anyway, you have to check how your office handles u/c date.
If I leave country and re enter during the 1st 12 months with new insurance giving effectively up to 23 months
-> Roughly right. But if saying precisely, you need to enter Thailand again within the Non-OA visa itself validity with a new insurance policy to be stamped for another 365 days (or insurance validity, shorter one). That is not 12 months from the first entry stamp or within the validity of the entry stamp. If you manage well, you can get almost 2 years of stay from one Non-OA visa.
Q. can the 65,000 baht monthly international transfer be used, if I have that evidenced in Thai bank (UK citizen) or does 1st extension always need to be 800,000 seasoned funds method?
-> That is what you need to ask the local immigration office. Some accept monthly and international transfers for 12 months when you apply for the first 1-year extension from a Non-OA entry stamp - i.e. if you have been in Thailand on Non-OA. But some may not.
No downside to try to see it's approved or not. But many offices allow 90 days report "within 15 days and not less than 7 days before the due date of notification". Be ready for this. If your application is rejected, you have until 7 days later to report at the local immigration office.
, you can apply for Non-OA in the US with funds in your home country. If you want to apply for Non-O, you need to apply for 1-year extension in Thailand and it requires you to have funds in Thailand. Check requirements of them on the website of embassy/consulate that you aply for your visa through.