In practice, not all factories are equal. While, some factory operators may need to merely notify the authorities, others would not be permitted to start any operations until a factory license is issued. You can find more information below.
The description of a factory is given as
a building, place or vehicle that uses machinery with an engine higher than or equivalent to five horsepower, or which employs seven or more workers with or without any machine for manufacturing, producing, assembling, packing, repairing, maintaining, testing, improving, processing, conveying, storing or destroying anything included in the classes or types of factories presently listed in the Ministerial Regulations, and that is not owned or operated by government agencies for the purpose of national security or safety.
Under the Factory Act B.E. 2535, the Ministry of Industry is responsible for regulating the construction, operations, expansions, issuance of licenses, and overseeing of all related matters such as pollution and safety in relation with factories in Thailand.
License duties of each factory largely depend on what it manufactures and a host of other factors. Those that come into play are:
There is no requirement for a license if you are operating a small sized factory, but you must still comply with the ministerial regulations. Factories which do not cause pollution, use machinery with engine of 20 horse power or less and/or employ 20 workers or less to work in the factory are considered as small sized factories. Factory License: Compliance Required
Medium sized factories must notify the Ministry about the existence of the factory and can begin operating upon receiving a letter stating that the report has been acknowledged. Medium sized factories are those causing little or no pollution, with engine of machinery used being no more than 50 horsepower and/or the number of employees working at the factory not more than 50. Factory License: Notification Required
Large factories are required to apply for a factory license from the responsible government authorities prior to beginning operations due to the fact that they cause pollution or environmental hazards, use machinery with more than 50 horsepower and/or employ more than 50 workers in the factories. Factory License: License Required
The consideration period for a factory license is at a minimum of 90 days, during which time an official will drop by the factory premises for an inspection. Once issued, the license is valid for five years at a time and must be renewed prior to expiry.