Can I extend my visa for another 70 days based on my marriage to a Thai national?

i have done on visa exempt it’s 60 days

I’ve recently did this extension. It’s a PITA, paper work wise.

- if your wife took your last name, you’ll need a photo copy and the original paperwork for that.

- if she doesn’t own the property you live in, you’ll need a copy of the owners ID card with a written note stating she rents from them.

This is along with what’s listed in that photo Brandon posted.

Also, it starts the day you apply. It’s not like the other extensions, gets added on.

On a visa exempt? I haven't heard of this before

You won't be extending based on marriage per se, because marriage extension is for 1 year and requires 400,000₿ in the bank.

What they were likely talking about is the visiting Thai family extension. I've attached a photo with the general guidelines for this extension but there may be additional requirements based on the office.

This extension is only for 60 days, so you won't be able to get 70 days. You can only do this once per entry to Thailand so after this your only options are the 1 year marriage extension with proof of funds, or leave Thailand.

Beware that because you're changing the reason for your extension away from tourism, it's possible this new extension may start from the day you apply and not from the end of your current stamp.

If you wait to go on Monday, I highly recommend making an appointment as Monday is usually the busiest day.