What is the process and document requirements for extending a TR visa in Thailand?

You came in on a tourist visa, write TOURISM and leave it at that

Where are you in Thailand ?

Have you filed a TM30 as address of where you are staying ?

>what did you place in the reason for extension in the TM7?

I recommend trying for a 60 day extension of stay based on unable to travel due to COVID-19. I would write:

"60 day extension of stay based on unable to travel due to COVID-19".

If they say no, they'll give the 30 day extension of stay based on tourism as default.

>What documents did you bring when applying for the extension?

Different immigration offices have different requirements, but all require the following:

1. Your passport and:

a. a copy of your data ("picture") page

b. a copy of your most recent visa (if you have one)

c. a copy of your most recent stamp

d. a copy of your departure card

2. A TM30, filed in the immigration office.

3. The forms (each immigration office may have different forms)

4. A letter from your embassy saying you can not return, OR a print out from your embassy saying they don’t issue the letters [MAY NOT be needed - ask your local immigration office].

5. 2x passport pictures

6. 1,900 THB.

Different immigration offices have different policies. *SOME* may require:

- The ID card of the property owner where you are staying

- Copies of *ALL* stamped pages in your passport

A 30 day extension of stay based on tourism require the same documents except for the letter from the embassy.