How early can I renew my Thai retirement visa?

45 days in Hua Hin

At chonburi immigration pattaya they told me 45 days when i did the extension in February 2025.

You wouldn't be "renewing" anything 😮 you'd just be applying for a new year "extension of stay" based on retirement.

You don't say where you are in thailand and there are over 80 immigration offices in the country

At most immigration offices you can do it when you have 30 days or less left on your current stamp, in Bangkok, Chiang Mai, Phuket, and a few others you can do it when you have 45 days or less left on your current stamp