Definition. An industrial estate is, in the words of section 4 of the IEAT Act, a general industrial zone or a free zone. Inside it, the IEAT Governor grants the permission to operate and the factory and building approvals. An entrepreneur who is a foreigner may also hold the land, subject to a duty to sell it after the business ends.
What is an industrial estate in Thailand under the IEAT Act?
An industrial estate in Thailand is a zone that the IEAT Act classifies as either a general industrial zone or a free zone. A general industrial zone is set aside for industrial, service and connected business. A free zone is set aside for industrial, commercial or related activity and carries special customs and tax treatment. The Governor, not a ministry, is the permitting authority in both.
Section 4 also defines the two kinds of operator. An industrial entrepreneur is a person permitted to operate an industrial or service business inside an estate. A commercial entrepreneur is a person permitted to trade or provide services in a free zone. These definitions matter, because the land and customs provisions attach to the entrepreneur, not to the corporate vehicle in general.
| Zone type | What the Act says it is for | Where the special treatment sits |
|---|---|---|
| General industrial zone | Industrial, service and connected business operations | Permits and approvals under sections 41 and 42; land ownership under section 44 |
| Free zone | Industrial, commercial or related activity serving economic, security or public-welfare purposes | The same provisions, plus the customs and tax treatment in sections 48 to 52 |
Which permits does an operator need inside an industrial estate in Thailand?
An operator inside an industrial estate needs a written permission from the IEAT Governor under section 41 before it carries on business there. Section 42 then makes the Governor the authority for the approvals that other laws assign to state agencies: land excavation and filling, building control, public health and factory operations.
However, these two sections do different jobs. Section 41 is the permission to be in the estate and to run the business. Section 42 moves the grant of the construction and factory approvals to the same office. Once an operator obtains an approval from the Governor, the Act treats the operator as compliant with the law that would otherwise have required the approval from another agency.
How do the approval procedures differ from those for other sites?
The BOI One Start One Stop Investment Center describes the factory licence as a three-stage procedure, and it separates estate sites from sites elsewhere. For example, inside an IEAT estate, the application goes to the IEAT One Stop Service Center. By contrast, outside an estate it goes to the Ministry of Industry provincial offices. The table below lists the stages and the processing periods that the Center publishes. We do not add them together, because the source states no aggregate period and each stage depends on a complete file.
| Stage | Inside an IEAT estate | Outside an estate | Period published by BOI OSOS |
|---|---|---|---|
| 1. Land and factory construction | IEAT form 01/1, filed at the IEAT One Stop Service Center | Ministry of Industry provincial office | 1 day |
| 2. Construction authorisation | IEAT form 02/1 with engineering certificates and plant layout drawings | Ministry of Industry provincial office | 50 days |
| 3. Operation authorisation | IEAT form 03/1 with production process, raw materials and updated shareholder information | Ministry of Industry provincial office | 18 days |
What happens if construction starts without approval?
Section 43 lets IEAT suspend construction that has no permission, departs from the approved plan or breaches a condition. It can order the builder to modify or demolish the work within a reasonable period. If the builder does not comply, then IEAT can carry out the work at the builder’s expense. In addition, section 73 penalises operating without the section 41 permission, and the consolidated text provides for the court to order the business to stop.
Can a foreign manufacturer own land in an industrial estate in Thailand?
Yes, because section 44 of the IEAT Act allows an industrial or commercial entrepreneur to hold ownership of land in an estate for the operation of its business, in the area the IEAT Board considers appropriate, even where that area exceeds the limit set by other laws. An entrepreneur who is a foreigner must sell the land within three years after dissolving or transferring the business.
The exit clock is the part of section 44 that deserves the most attention. Specifically, if a foreign entrepreneur dissolves the business or transfers it to another person, it must sell the land and its component parts to IEAT or to the transferee within three years of that date. Otherwise, the Director-General of the Department of Lands sells the land under the Land Code. In other words, the permission to own is real, but it is tied to the business that justified it.
What does the IEAT Board notification add?
The Board’s Notification (No. 2) B.E. 2553 (2010) sets the rules, procedures and conditions for holding land. First, it defines a business operator as an industrial, service or commercial operator permitted to use estate land, including partnerships and limited companies under the Civil and Commercial Code. Second, it permits residential land only for employee and worker accommodation. For executives and skilled workers, the notification then limits each family to 200 square wah, with total caps of 3 rai in Bangkok and the surrounding provinces and 5 rai elsewhere. For factory workers, it allows 1 rai per 100 families, capped at 5 rai in the central region and 10 rai in other areas. Finally, clause 6 repeats the three-year duty to sell for foreign operators. The notification is available on the IEAT website, and the caps should be checked against the current text before any acquisition is planned.
How does the IEAT exit clock compare with other Thai land regimes?
Thai law gives a foreign-owned manufacturing company more than one route to land. Therefore, each route has its own disposal period. The table compares the three that arise most often. Our guide to BOI land ownership in Thailand covers the Investment Promotion Act route in detail.
| Regime | Provision | Disposal period after the business ends or transfers |
|---|---|---|
| IEAT estate land | IEAT Act, section 44 | Three years; then forced sale by the Director-General of the Department of Lands |
| BOI-promoted land | Investment Promotion Act, section 27 | One year |
| Ordinary Land Code acquisition by a foreigner | Land Code, section 94 | Between 180 days and one year |
What does a free zone add to the permits and land rules?
A free zone adds customs and tax treatment on top of the permitting and land provisions. Under sections 48 to 52, for example, goods enter with duty-free treatment under the customs law. Machinery and equipment imported for manufacturing or commerce are exempt from investment-promotion fees, import duty, value added tax and excise tax. Products manufactured and exported from the zone are exempt from export duty, value added tax and excise tax.
However, the benefit ends at the zone boundary. Under section 52, goods or products removed for domestic use bear the taxes, duties and fees that apply on the date of removal. They must also meet the controls and standards that apply to imports. Section 49 lets the Minister prohibit particular goods for reasons of security, public order, health or the environment by Ministerial Regulation.
Sections 45 to 47 add two further entitlements for entrepreneurs in an estate. First, section 45 allows skilled workers, specialists and their families to enter in numbers and for periods that exceed the ordinary limits, subject to immigration law and to the Board’s discretion. Second, section 47 allows an entrepreneur domiciled abroad to remit foreign currency for repatriated capital and dividends, foreign-approved loans and contractual funding commitments.
How do an industrial estate in Thailand, BOI promotion and the Foreign Business Act fit together?
They are three separate instruments that answer three separate questions. First, the IEAT Act answers where the operator may build and hold land. Second, the Investment Promotion Act sets out which promotion privileges the project receives. Third, the Foreign Business Act decides whether a foreign-controlled company may carry on the activity at all. Approval under one does not stand in for the others, so a buyer needs all three answers.
Sections 41 to 44 of the IEAT Act deal with permission to operate, approvals and land. However, none of the provisions summarised in this article addresses the foreign-ownership status of the operating company under the Foreign Business Act. That question has its own analysis, which we set out in our comparison of BOI promotion and the Foreign Business Licence.
| Question | Instrument | Decision maker |
|---|---|---|
| May the operator run a business in this estate? | IEAT Act, section 41 | IEAT Governor |
| Who approves the factory, building and excavation work? | IEAT Act, section 42 | IEAT Governor as the competent official |
| May a foreign operator hold the land? | IEAT Act, section 44 and Board Notification (No. 2) B.E. 2553 | IEAT Board |
| What promotion privileges apply? | Investment Promotion Act | Board of Investment |
| May the foreign-controlled company carry on the activity? | Foreign Business Act | Ministry of Commerce and the Foreign Business Committee |
Which points should a buyer settle before committing to an industrial estate in Thailand?
A buyer should settle four points before it signs: which regime governs the land, what the exit timetable is, whether the corporate structure triggers the transfer provisions, and which approvals IEAT will issue. Each point comes straight from the text of the Act. Therefore, a buyer can resolve it at the outset and avoid a dispute later.
| Decision | Legal source | Why it matters |
|---|---|---|
| Which land regime applies | IEAT Act s.44; Investment Promotion Act s.27; Land Code s.94 | Each carries its own area limit and its own disposal period |
| Meaning of “transfer of business” | IEAT Act s.44, second paragraph | The text does not say whether a share sale of the landholding company starts the three-year clock, so the point needs a considered answer before a group sale |
| Worker housing land | Board Notification (No. 2) B.E. 2553, clause 5 | Residential land is limited to employee and worker accommodation and is capped by area |
| Approvals and their conditions | IEAT Act ss.41 and 42 | The Governor grants the permission and the factory and building approvals, so the conditions come from one office |
| Interaction with BOI promotion | IEAT Act s.44 and Investment Promotion Act s.27 | The two provisions each contain a disposal duty, and the sources reviewed do not state how they combine on one site, so the interaction should be confirmed with both agencies |
What does Lex Bangkok do on this type of mandate?
We work through the matter in a fixed order, so each decision rests on the one before it.
- Regime selection. We compare the estate route with a site outside an estate on permitting authority, land rights and exit timetable, and we record the conclusion in a written opinion.
- Vehicle and land holding. We structure the Thai company that will hold the land and the licences, with the Foreign Business Act and any BOI promotion analysed alongside.
- Permission and approvals. We prepare and file the section 41 application and coordinate the section 42 factory, building and excavation approvals through the IEAT One Stop Service Center.
- Contract review. We review the lease or the sale agreement against section 44, so that the exit provisions reflect the three-year duty to sell.
- Exit and restructuring planning. We advise on the transfer, dissolution and group-restructuring steps that start the disposal clock, before the client takes them.
Frequently asked questions about an industrial estate in Thailand
What is IEAT?
Does IEAT issue the factory licence inside an industrial estate?
Can a foreigner buy land in an industrial estate in Thailand?
What happens if a foreign owner does not sell within three years?
Is a free zone the same as an industrial estate?
Does an industrial estate permit replace BOI promotion or a Foreign Business Licence?
Instruct us on your factory site investment
If your company is choosing between an IEAT estate and a site outside one, or is planning to hold industrial land through a foreign-owned Thai company, we prepare the regime opinion, the land-holding structure and the section 41 and 42 filings for your matter. See how our factory licence practice supports manufacturers from the first site visit to operation.
Sources: Industrial Estate Authority of Thailand Act B.E. 2522 (1979), English consolidated text published by the Industrial Estate Authority of Thailand; Board of Directors’ Notification (No. 2) B.E. 2553 (2010); BOI One Start One Stop Investment Center procedure for obtaining a manufacturing licence. This article provides general information only and does not constitute legal advice. Please contact us about your specific circumstances.