What is the grace period for renewing a one-year extension based on retirement in Thailand?

Be aware that Siricha may still require a medical certificate of good health signed by a doctor.

It can easily be obtained in Siricha in any of the street medical clinics...use to be a fee of 200 Thai baht. No tests..doctor sees you breathing...you pass.

Suggest you go to Siricha immigration and get their list of extension requirements. I used that office for many years for my one year extension of stay as retiree.

Go to Si Racha office before it's expired.

What

@Benjamin *****

and

@Tod ********

said pretty much covers it. When it is expired, it is expired. No grace after that. On the other hand you do have 30 days before that (45 in some offices) to be the early bird.. Absolutely no reason to wait until last minute, as you won't lose any time by going early.

there is no grace period, you could have applied for a new yearly extension when you had 30 days or less left on your current stamp

you will accrue a 500 baht a day overstay fine for every day after the expiration date you wait to get another extension

>Can anyone tell me what the grace period is for renewing the one year extension based on retirement after it's official expiry date?

None. If you do not submit a new one year extension of stay based on retirement request when it is due, then you must restart the process.