Urgent and Essential Work:
Exemption from Work Permit requirements is granted to aliens who enter the Kingdom temporarily, but in accordance with the immigration law, to perform any work of any "urgent and essential nature" for a period not exceeding 15 days. However, such aliens may engage in work only after a written notification on a prescribed form, signed by the alien and endorsed by his employer, has been submitted to and accepted by the Director-General or his designee.
Aliens entitled to this treatment may enter Thailand with any kind of visa, including a transit visa. The term "urgent and essential work" is not explicitly defined and consequently, the issuance of this sort of exemption is a matter of administrative discretion.
An alien seeking permission to work in the Kingdom under the Investment Promotion Law must submit his application for a Work Permit within 30 days of notification by the Board of Investment that his position has been approved. An alien in this category may engage in authorised work while the application is being processed.