What are the requirements and process to extend a 90-day Non-O spousal visa for a year in Thailand?

In udon its usualy easy

If you are paying an "expeditor", you shouldn't need much at all 😅

If you have the 400K THB seasoned in your bank account for 60 days, there is *NO REASON* to use a visa agent or whatever. The specifics vary across immigration offices, but you will need:

1. Your spouse to be next to you, and

a. Her blue book and a copy of the front page of the book

2. proof of the 400K THB bank statement

3. Your passport and:

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

b. A copy of your entry stamp

c. A copy of your visa

d. A copy of your departure card (stapled)

4. A TM30 filed of where you and your wife live

5. Your marriage certificate, and a copy of your marriage certificate

6. A *HAND DRAWN* map to your house

7. The application form (gotten at the immigration office)

8. 2x passport pictures

9. 1,900 THB for the application fee.

I believe those are all the requirements you need to get the one year extension of stay based on marriage to a Thai national.

When does your current 90 day Non-O stamp run out?

The reason I ask IS, if it's soon and you don't want a gun to your head trying to get everything together, just apply for a 60 day covid extension to buy you more time to get things sorted out

Extent to an O Visa! Go to your local immigration office and speak with the officer. It’s pretty simple and no need to spend money on a third party!

Didn't you or your thai speaking wife ask for the hand out they give in Section L-1 out at Chaengwattana Immigrations where you apply for your year extension?

the one that lists the documents, the photos, the copies, etc

The most important question IS

do you meet the proof of funds on your own OR do you need the "expeditor" to "grease the wheel" so you can get the extension?