What are the pros and cons of applying for a retirement visa for Thailand from the UK versus applying in Thailand?

I’ve found the Thai embassy in the UK very quick so you might be able to get it done in time. They just email you the visa now so you don’t have to send your passport in to them. So if you don’t get it in time you can still travel to Thailand but arrive as a tourist with visa exception. If you later border bounce and your evisa has come through (that you applied for in the UK) you can print and use that. I found it very quick and easy to do online. It took less than a week and that jncluded asking for more information that I had forgotten to give.

Here's a recent post about getting the retirement Visa and extension of stay inside Thailand

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Pushing it to get in time for applying in UK but possibly could be done. Advantage is you get 90 days on entry to get your ducks in a row for an extension, but many just wing it here on a tourist or exempt entry and start the process of getting the non O in country to start and then subsequent extensions from there.

I have placed the TOPIC of Extension 50 years+ Retirement

on your post...

CLICK on it and all posts about it will pop up to read the experiences of others.

Be sure to visit your local Thai Immigration office for their list of requirements for both the Non O Visa and its One year extension of stay as retired. These are the common found requirements...

I really believe that you have waited too long to apply for the Non O Visa as retiree using the Evisa online application system and with the Thai Embassy in the UK.

Most folks like you are coming to Thailand and obtain the Non O Visa as retiree and the One year extension of stay as retired from their local Thai Immigration office.

Carl had you read my PM reply to you ...This is what I said..