What do I need to provide to renew my retirement visa in Thailand?

You cannot renew a Retirement Visa. When the visa reaches its en date, it is gone forever and cannot be renewed. I believe that you will want to aplly for an Extension of Stay based on being over 50. Each Immigration Office has there own list of requirements and these vary depending on the Immigration Office.

Varies from io to io ...they provide a list ...

Everything as before

You aren't renewing anything,.

Every year you apply for a brand new yearly extension from scratch, doesn't matter how many previous year extensions You've had each one is its own stand alone application.

Requires all the same documents all over again, copies, lease, TM 30, landlord id, house book, bank letter, year detail transaction report, bank book copies, updated bank book the day you apply.

You are advised to go to your immigration office and get their hand out because with 80 offices in the country each one doing their own thing there could be different things your office requires that are not required at other offices.

Remember you can apply for a year extension when you have 30 days or less left on your current stamp at most offices so don't let your stamp run down right to the end, you don't lose any time applying early they add the year to your current expiration date.