Can I get a visa extension while waiting for my work permit in Thailand?

It all depends on your employer. If your employer is competent enough then what he should do is gather all required documents for applying visa and work permit then take you to department of Labour on Monday to submit the application. If labour office accepts the application they will give you a waiting receipt to pick your work permit in about 5 to 7 days. You can use the receipt at immigration as prove that you will get the work permit and they extend your visa as per the employment period indicated in the work permit receipt.

Don't you need the visa before the work permit? There is no short term visa available to you. You either manage to get your non-b by 1st march or leave by 1st march.

If your new employer provides all documents for work permit and visa you can get an extension.

In my case ,I only need last year P.N.D91 for applying new visa . You need to apply new work permit as the same day when your old work permit cancellation day and need to go to immigration to cancel old visa and wait new visa.That need to be finished one day . I think it’s depend on the new employer good communication.

Unfortunately, you are out of the option you can do anything in Thailand other than apply new visa/extension and work permit in time. You may need to leave Thailand and come back. Talk with your new employer about the procedure you have to follow.