What should I do after losing my visa extension due to not having a re-entry permit when returning to Thailand?

Trev I am sorry you were not aware of the need for the reentry permit when you left Thailand for a week and returned. As others have correctly replied, your Extension of Stay to January 2020 was lost when you departed without a reentry permit in your passport.

You now need to contact your local Thai Immigration office and get their direction and requirements to obtain new retirement requirements for your permission to stay.

Good Luck...

I close commenting.

OK so from reading all this

If you have an oa retirement visa leave just before it runs out come back in get an extra 12 mths which is single entry each time you leave in next 12 months you have to get a re-entry visa

I came back into Thailand from the UK with a new passport only to find I could not accompany my gf to Vientiane until my old passport stamps were transferred into the new passport, even I presented the old passport as well. There are many ways to catch a cold in the land of Smiles.

Sorry you did not appreciate the significance of a reentry permit

Even 2 hours can be tight if first flight is delayed ,which happens a lot in DUB .I have missed connections in AUH or else i have made the flight but my bag did not!

And it is all the fault of Immigration, as they stamp in your passport the Extension of Stay and just underneath the warning: To keep your stay permit valid a re-entry permit must be made before leaving Thailand. But who read a stamp inside the passport, i agree, nobody it seems. Laos Immigration was very surprised I did not leave the booth and opened up to check the entry stamp and date first. He said, it is good it is for 30 days and I replied I check first, but I see now, thanks.

Things do get confusing sometimes and i still believe a lot of it is down to wrong terminology. To the OP.....you were stopped for not having a re entry permit (not visa). Also your visa was not cancelled, your extension of stay was.

Your choice is to go to your immigration office and see if they can do an in country conversion from the 30 day visa exempt entry stamp to a 90 day Non-O visa.

Keep in mind not every office can do it AND that all offices that can do it require you to have between 21 and 15 days left on your current stamp to do it. (because the application goes under consideration for between 14 and 21 days before you go back to get the Non-O and a new 90 day stamp inked into your passport).

If you can do it in country but the current 30 day stamp you're on doesn't have enough time left you can always get a 30 day extension for 1900baht and then apply.

as people pointed out you canceled your own extension when you stamped out of the country without having bought a re-entry permit BEFORE you left. :/

You’ll need to start the process again. Immigration doesn’t care if all your assets are in Thailand.

All for the sake of 1000bht

You cancelled your own visa when you left Thailand. Have to start visa application process again

Or return to UK and apply for an O-A visa for retirement. Easy to obtain and NO money needed in a Thai bank. Good Luck.

I am afraid you will need to start all over. Without a reentry permit, your permission/extension to stay expired. Go to your local immigration office and ask for a list of requirements for your conversion of current exempt entry to O and Extension of Stay.

Second error is having all your assets in Thailand!!!

Cathy correct there sorry.you cancelled your own visa.by no back up of re-entty.

I’m not an expert but I think you may have to start the process over. Your extension was voided if you left the country and did NOT have a re entry permit.