What are the best options for extending a work permit and visa in Thailand?

To extend your work permit, you should return to the Ministry of Labor where you applied for it. If you're looking for an Extension of Stay on your Non Immigrant B Visa, you can do this at your local Immigration Office, provided you have the necessary documents from your employer. Alternatively, you can apply for a new Non Immigrant B Visa at a Thai Consulate or Embassy. Note that Penang has tightened its visa policies, now primarily issuing year-long, multi-entry Non-B visas only to individuals in certain circumstances, such as being a managing director or holding at least 20% shares in a company.