What are the visa and work permit options for expats married to Thai nationals wanting to live in Thailand permanently?

There are a couple ways you can go about doing this;

One is to get a year-long, multi-entry Non-Immigrant Type O visa based on marriage from the thai consulate in Savannakhet. It requires NO financial proof of funds at all. This visa requires that you exit/re-enter the country every 90 days to get another 90 day stamp, which you do for the entire year.

Or you can get a 90 day Non-O visa (inside or outside the country) and then apply for the yearly extension of stay. That requires the financial proof, the pile 'o documentation AND it goes under consideration for a month (where the immigration office can make a visit to your house and interview you/your wife and the neighbors) before you go back and get the year's extension inked into your passport. This type also requires a re-entry permit if you're going to exit/re-enter thailand during the year.

Here's the link to how to go about getting the affidavit of income/pension letter from the UK consulate here. It's all done by mail

Yup all changes now ..bring a big bag of money 😂😂

I agree with Steve. But with Extension of Stay you need re-entry permits if you want to travel abroad. 1000 Thb for single or 3800 Thb for multiple and can be directly applied for when you got the extension of stay. Non Immigrant O based on marriage is also no problem for getting a Work Permit.

You can apply for a non imm O visa based on marriage, which you can also work on, and then apply for a 1 year extension of stay, based on marriage. The main requirement is 400,000bt in a Thai bank account or an income of not less than 40,000bt per month.

Did you register the marriage with the Amphoe office?