How can I get a COVID extension for my non-B visa while living in Bangkok?

@Chris ******

all you can do is try for it. worse case they'll sell you a 7 day get out of thailand stamp (application for extension not approved) and you have a week to leave

To be able to apply for a new extension, you have to do it with 2 steps:

1. cancel your work permit and extension at the Nakhon Pathom offices.

2. apply for a new extension at Bangkok Office (in your case, Chaengwattana) with a TM30 receipt in Bangkok.

You have to be at the immigration office physically when you apply for your extension.

Be aware, that a Covid extension is not the promised thing like a 30 days tourism extension for tourists. You sure can try to apply for it, but if your application is approved or not totally depends on the discretion of the officer you are dealing with on the application day. Better to have Plan B.