Factory License in Thailand: A Guide for Chinese Manufacturers

This guide is available in English and Chinese.  |  本指南提供中英文版本，中文版请见下方。

Why Chinese Manufacturers Are Choosing Thailand

Global trade pressures have pushed Chinese manufacturers to build capacity outside China, and Thailand has become a leading destination. The country offers a mature industrial base, deep automotive and electronics supply chains, and free trade agreements that open the wider ASEAN market. The Eastern Economic Corridor (EEC) — covering Chonburi, Rayong, and Chachoengsao — now hosts a fast-growing cluster of Chinese factories, especially in electric vehicles, electronics, and components.

Yet market entry still depends on regulatory execution. A Chinese group can sign land contracts and order machinery quickly, but production cannot begin until the factory license in Thailand is approved. Treating the license as a late-stage formality is the most common, and the most expensive, mistake a new investor makes.

Can a Chinese Company Own a Factory in Thailand?

Yes — and the ownership position is more favourable than many investors expect. Manufacturing generally falls outside the restricted lists of the Foreign Business Act, so a Chinese company can usually own 100% of a Thai manufacturing entity. Unlike many service businesses, a factory project rarely needs a Thai majority partner.

Land is the second question. Thai law normally bars foreign companies from owning land, but two routes solve this for manufacturers. A company that the Board of Investment (BOI) promotes may receive permission to own land for its project. Separately, a company that operates inside an industrial estate may own its plot under the industrial estate framework. Our guide to foreign ownership rules in Thailand explains the wider picture.

The Factory License in Thailand: Ror Ngor 4 Explained

The Factory Act governs every industrial operation in the country. The 2019 amendment reshaped the system and narrowed the definition of a regulated “factory” to operations that use machinery of at least 50 horsepower or employ at least 50 workers. A large corporate plant sits well inside that definition, so the licensing rules apply in full.

The three factory categories

The Act sorts factories into three categories:

• Category 1 covers small, low-impact operations that may run without a license or prior notice.
• Category 2 covers medium operations that must notify the Department of Industrial Works before they start.
• Category 3 covers large-scale or higher-impact operations. These must obtain a factory license — the Ror Ngor 4 — before construction and before operation.

Almost every large Chinese manufacturing project falls into Category 3, so the Ror Ngor 4 license becomes the central approval for the whole investment.

What the 2019 reform changed

The 2019 amendment delivered one change that materially helps long-term investors: a Category 3 factory license no longer expires and no longer requires five-year renewal. The license now lasts for the life of the factory, subject to an annual operating fee and continued compliance. The reform also widened the use of authorised private inspectors, which can speed up inspections. The Department of Industrial Works administers this framework at the national level.

The Industrial Estate Route: IEAT One-Stop Licensing

Most large Chinese corporates never deal with the Department of Industrial Works directly. Instead, they locate inside an industrial estate that the Industrial Estate Authority of Thailand (IEAT) governs. This route changes the licensing experience in three important ways.

First, a factory inside an IEAT estate obtains its permit to operate through the IEAT itself, under a one-stop service that consolidates land use, construction, and factory operation approvals. Second, a company that operates in the estate may own its land — a statutory exception to the general ban on foreign land ownership. Third, many estates contain an IEAT Free Zone, where imported machinery and raw materials receive customs and tax privileges.

Estates developed under the IEAT framework already host large Chinese manufacturers and provide infrastructure, utilities, and environmental systems built for heavy industry. For a corporate group that values speed and certainty, the estate route usually outperforms a standalone site.

How to Get a Factory License in Thailand, Step by Step

A well-run project follows a clear sequence, and the order of the steps matters as much as the steps themselves:

1. Incorporate the Thai company. Register a limited company, which a Chinese parent can usually own in full for manufacturing.
2. Secure the site. Select and reserve a plot inside a suitable industrial estate, then negotiate the land or lease terms.
3. Apply for BOI promotion (optional). File the BOI application before you import machinery, because several incentives depend on timing.
4. Obtain the factory license. Apply for the Ror Ngor 4, or for the IEAT permit to operate when the project sits inside an estate.
5. Complete the environmental review. Higher-impact projects must finish an Environmental Impact Assessment (EIA) before approval.
6. Build and connect. Obtain the construction permit, build the plant, and pass the pre-operation inspection.
7. Prepare the workforce. Arrange work permits and visas for Chinese management and technical staff.

The sequence is unforgiving. Importing machinery before BOI approval, or starting construction before the license clears, can forfeit incentives or trigger penalties.

Inside the Rg.4 Application: The Document Set and Process

The steps above describe the journey at a high level. However, the licence application itself is a detailed technical filing, and understanding its structure helps a corporate team plan resources and avoid delay. A Category 3 project is submitted on the Rg.3 application form; once the authority approves it, the factory receives the Rg.4 operating licence.

The four stages of an application

In practice, a well-managed application moves through four working stages:

1. Application preparation and documentation. First, the team completes the Rg.3 application form, drafts a power of attorney where an agent files on the company’s behalf, and certifies true copies of the corporate documents.
2. Technical drawings and engineering documentation. Next, the team prepares the factory building plans, the machinery installation layout and machinery list, the production-process flow chart, and the pollution-control documents for wastewater, air emissions and industrial waste.
3. Licensed-engineer certification. After that, qualified engineers sign and certify the technical documents — the subject of the next section.
4. Coordination, printing and submission. Finally, the team assembles the document checklist, prints the plans at the correct sizes, and files and follows up the application with the authority.

The supporting document set

Furthermore, a Category 3 factory file usually contains the documents below:

• the application forms, together with certified copies of the corporate documents;
• factory building plans drawn to scale, plus a map of the surrounding area;
• a layout of the structures inside the factory site, at a scale no smaller than 1:500;
• the machinery installation layout, with a complete machinery list;
• the production-process detail and its environmental-impact points;
• design-and-calculation plans for the pollution-control systems; and
• a statement of the measures that prevent nuisance, noise and vibration.

Three practical points matter for a Chinese investor. First, every document must reach the authority in Thai, so source materials in Chinese or English need certified translation. Second, the authority expects several complete sets of the application, with plans printed at A4, A3 and large-format A0. Third, officers usually return the file for revision once or twice before approval, and the production-process and pollution sections attract the closest scrutiny.

Which Documents Must a Licensed Engineer Sign?

A factory license in Thailand is not only a legal filing. Several of its technical documents become valid only after a licensed professional engineer signs and certifies them. Each certification must be submitted together with a certified copy of that engineer’s professional license, issued under Thailand’s engineer-licensing regime. An engineer who is unlicensed, or licensed at the wrong grade, will stall the application.

The four engineering disciplines

In practice, four engineering disciplines normally certify a Category 3 factory file:

• Civil Engineer. First, this engineer signs and certifies the factory building plans. As good practice, the same civil engineer should certify the building plans used for the construction permit application (Form Or.1), so the two filings stay consistent.
• Industrial Engineer. Next, this engineer certifies the machinery installation layout and the machinery list, confirming that the equipment and its arrangement are sound.
• Environmental Engineer. Likewise, this engineer certifies the production-process flow, the environmental-impact points, and the design-and-calculation report for the pollution-control systems that treat wastewater and air emissions. Higher-impact projects require an environmental engineer at a senior professional grade.
• Mechanical Engineer. Finally, this engineer certifies specialised thermal and combustion equipment, such as a regenerative thermal oxidiser (RTO) installed for air-emission control.

Settle responsibility for engaging each engineer at the outset. Investors often appoint the building-plan civil engineer directly, while the legal and engineering team handling the application arranges the remaining certifications. In every case, the engineer must hold a valid Thai professional license in the relevant field, and the certified copy of that license travels with the document into the application file.

BOI Incentives for Foreign Manufacturers

The Board of Investment promotes manufacturing with a strong package of incentives. A promoted project can receive a corporate income tax holiday, exemption from import duty on machinery and on raw materials used for export production, permission to own land, and streamlined work permits for foreign staff. Our BOI manufacturing guide sets out the categories and application steps in detail.

BOI promotion remains optional, yet for a capital-intensive plant the savings are significant. Most large Chinese manufacturers apply, and the EEC layers further incentives on top. Our EEC investment guide explains how the corridor strengthens the case for a factory license in Thailand.

Common Pitfalls, and How Large Corporates Avoid Them

Even experienced manufacturers stumble on the same issues:

• Misjudging the category. Teams assume Category 2 applies when the project clearly needs a Category 3 license, and the whole schedule slips.
• Underestimating the EIA. Environmental review can take months, so strong projects start it early and run it in parallel.
• Buying land outside an estate. A plot outside an industrial estate may block foreign ownership and complicate the licensing.
• Sequencing errors. Ordering machinery or breaking ground before approvals can cost incentives and invite fines.
• Thin compliance after launch. The license carries continuing duties — safety, emissions, reporting — and inspections continue for the life of the plant.

A disciplined Chinese corporate group treats licensing as a project workstream from day one, with legal counsel coordinating the authorities, the BOI, and the environmental review in parallel rather than in sequence.

Frequently Asked Questions

The Bottom Line for Chinese Manufacturers

A factory license in Thailand rewards preparation. The manufacturers that reach production fastest treat ownership structure, industrial land, BOI promotion, the Ror Ngor 4 or IEAT permit, licensed-engineer certification, and environmental approval as one coordinated plan rather than a series of separate errands. For a large Chinese corporate group, the prize is real: a wholly owned plant, set in a mature industrial base, with privileged access to ASEAN markets. The license is simply the gateway, and careful planning opens that gateway smoothly.

This article offers general information on Thai industrial law and does not replace advice tailored to your project.

— 中文版 · CHINESE VERSION —

中国制造企业为何选择泰国

全球贸易格局的变化促使中国制造企业在本土之外布局产能，泰国已成为首选目的地之一。泰国拥有成熟的工业基础、完整的汽车与电子产业链，并通过多项自由贸易协定连接整个东盟市场。东部经济走廊（EEC）覆盖春武里、罗勇和北柳三府，目前已聚集大量中国工厂，尤其集中在电动汽车、电子产品及零部件领域。

然而，市场进入的成败仍取决于合规执行。中国企业集团可以迅速签署土地合同、订购设备，但在泰国工厂许可证获批之前，生产无法启动。把许可证视为后期手续，是新进投资者最常见、也是代价最高的错误。

中国企业可以在泰国独资拥有工厂吗？

可以——而且持股条件比许多投资者预期的更为有利。制造业通常不在《外商经营法》的限制清单之内，因此中国企业一般可以100%控股泰国制造公司。与许多服务行业不同，设厂项目很少需要泰方多数股东。

第二个问题是土地。泰国法律原则上禁止外国公司拥有土地，但制造企业有两条解决途径。获得泰国投资促进委员会（BOI）批准的企业，可获准为其项目持有土地；此外，在工业园区内运营的企业，可依据工业园区法律框架拥有厂区用地。如需了解整体情况，请参阅我们的泰国外资持股规则指南。

泰国工厂许可证（Ror Ngor 4）详解

《工厂法》规范全国所有工业经营活动。2019年的修订重塑了整个制度，并将受监管”工厂”的定义收窄为：使用机械功率达50马力以上，或雇用50名以上员工的经营场所。大型企业工厂显然符合这一定义，许可制度因此完全适用。

工厂的三个类别

该法将工厂分为三类：

• 第一类：规模小、影响低的经营活动，无需许可证或事先通知即可运营。
• 第二类：中等规模经营活动，开工前须向泰国工业工程厅提交通知。
• 第三类：大规模或较高影响的经营活动，必须在动工建设和投产之前取得工厂许可证，即 Ror Ngor 4（罗安4）。

几乎所有大型中国制造项目都属于第三类，因此 Ror Ngor 4 许可证是整个投资的核心审批。

2019年改革带来的变化

2019年修订带来一项对长期投资者有实质帮助的改变：第三类工厂许可证不再设有效期，也不再需要每五年续期。该许可证在工厂存续期间持续有效，企业仅需缴纳年度运营费并保持合规。此次改革还扩大了授权第三方检验机构的适用范围，有助于加快检验进度。泰国工业工程厅（DIW）在国家层面负责管理这一制度。

工业园区途径：IEAT 一站式审批

多数大型中国企业并不直接与泰国工业工程厅打交道，而是选择进驻由泰国工业园区管理局（IEAT）管辖的工业园区。这一途径在三个重要方面改变了审批体验。

第一，位于 IEAT 园区内的工厂通过 IEAT 取得运营许可，并享受一站式服务，将土地使用、建设和工厂运营审批整合办理。第二，在园区内运营的企业可以拥有其用地——这是对外资不得持有土地这一普遍限制的法定例外。第三，许多园区设有 IEAT 自由区，进口机械设备和原材料可享受海关与税收优惠。

依据 IEAT 框架开发的工业园区已聚集大量大型中国制造企业，并提供为重工业量身打造的基础设施、公用事业和环境系统。对于重视速度与确定性的企业集团而言，园区途径通常优于独立选址。

在泰国取得工厂许可证的步骤

一个管理良好的项目通常遵循清晰的顺序，而步骤的先后与步骤本身同样重要：

1. 注册泰国公司。设立有限公司，中国母公司通常可对制造业务实现全资控股。
2. 落实厂址。在合适的工业园区内选定并预留地块，随后商定土地或租赁条款。
3. 申请 BOI 优惠（可选）。在进口机械设备之前提交 BOI 申请，因为多项优惠取决于申请时点。
4. 取得工厂许可证。申请 Ror Ngor 4；若项目位于园区内，则申请 IEAT 运营许可。
5. 完成环境审查。影响较高的项目须在获批前完成环境影响评估（EIA）。
6. 建设与接入。取得施工许可、建造厂房并通过投产前检验。
7. 安排人力。为中国管理与技术人员办理工作许可和签证。

顺序不容有失。在 BOI 批准前进口设备，或在许可证获批前动工，都可能丧失优惠或招致处罚。

Rg.4 申请详解：文件清单与流程

上述步骤勾勒了整体路径，而许可证申请本身是一份内容详尽的技术文件。理解其结构，有助于企业团队合理配置资源、避免延误。第三类项目使用 Rg.3 申请表提交；主管部门批准后，工厂即获得 Rg.4 经营许可证。

申请的四个阶段

在实务中，管理良好的申请通常经历四个工作阶段：

1. 申请准备与文件整理。团队填写 Rg.3 申请表，在由代理人代为申请时起草授权委托书，并对公司文件出具核证副本。
2. 技术图纸与工程文件。团队编制工厂建筑图纸、机械安装布置图与机械清单、生产工艺流程图，以及针对废水、废气和工业废弃物的污染控制文件。
3. 持证工程师认证。具备资质的工程师对技术文件签字认证——即下一节的主题。
4. 协调、打印与递交。团队整理文件清单，按规定尺寸打印图纸，向主管部门递交并跟进申请。

配套文件清单

第三类工厂的申请文件通常包括以下内容：

• 申请表格，以及公司文件的核证副本；
• 按比例绘制的工厂建筑图纸，以及厂址周边区域地图；
• 比例不小于 1:500 的厂区建筑物布置图；
• 附完整机械清单的机械安装布置图；
• 含环境影响点的生产工艺详情；
• 污染控制系统的设计与计算图纸；以及
• 防止滋扰、噪音和振动的措施说明。

对中国投资者而言，有三点尤为重要。第一，所有文件须以泰文提交，因此中文或英文的原始材料需经核证翻译。第二，主管部门通常要求提交多套完整申请文件，图纸须按 A4、A3 及大幅面 A0 尺寸打印。第三，官员通常会在批准前要求修改一至两次，其中生产工艺与污染控制部分受到的审查最为严格。

哪些文件必须由持证工程师签署？

泰国工厂许可证不仅是一项法律申报。其中若干技术文件，须经持证专业工程师签字认证后方为有效。每一项认证均须连同该工程师专业执照的核证副本一并提交，执照依泰国工程师执业管理制度核发。聘用无执照、或执照等级不符的工程师，都会拖延申请。

四个工程专业

第三类工厂的申请文件，通常由四个工程专业出具认证：

• 土木工程师。对工厂建筑图纸签字认证。按良好实务，应由同一位土木工程师认证用于建筑施工许可申请（Or.1 表）的建筑图纸，以保持两项申报的一致性。
• 工业工程师。对机械安装布置图与机械清单出具认证，确认设备及其布局合理可靠。
• 环境工程师。对生产工艺流程、环境影响点，以及处理废水和废气的污染控制系统设计与计算报告出具认证。影响较高的项目需由较高级别的环境工程师认证。
• 机械工程师。对专门的热处理与燃烧设备出具认证，例如用于废气治理的蓄热式焚烧炉（RTO）。

各工程师的聘用责任应在项目之初即予明确。投资者通常直接委聘负责建筑图纸的土木工程师，其余认证则由办理申请的法律与工程团队统筹安排。无论何种情形，工程师均须持有相关领域有效的泰国专业执照，其执照的核证副本须随相应文件一并纳入申请档案。

BOI 为外国制造企业提供的优惠

泰国投资促进委员会以一揽子优惠政策鼓励制造业。获批项目可享受企业所得税免税期、机械设备及出口生产用原材料的进口关税豁免、土地持有许可，以及外籍员工工作许可的便利办理。我们的 BOI 制造业指南详细介绍了相关类别与申请步骤。

BOI 优惠属于可选项，但对资本密集型工厂而言，节省的成本相当可观。多数大型中国制造企业都会提出申请；EEC 还在此基础上叠加更多优惠，详见我们的 EEC 投资指南。

常见误区——大型企业如何规避

即使经验丰富的制造企业，也常在相同问题上受挫：

• 误判类别。团队误以为适用第二类，而项目实际明显需要第三类许可证，导致整体进度延误。
• 低估环评。环境审查可能耗时数月，因此优秀项目会尽早启动并同步推进。
• 在园区外购地。园区之外的地块可能限制外资持有，并使审批复杂化。
• 顺序错误。在审批完成前订购设备或破土动工，可能损失优惠并招致罚款。
• 投产后合规松懈。许可证附带持续义务——安全、排放、申报——检验将贯穿工厂整个存续期。

严谨的中国企业集团从第一天起就把审批作为独立的项目工作流来管理，由法律顾问统筹协调各主管部门、BOI 与环境审查并行推进，而非逐项排队办理。

常见问题解答

中国制造企业的核心要点

泰国工厂许可证青睐有备而来者。最快实现投产的制造企业，会把股权结构、工业用地、BOI 优惠、Ror Ngor 4 或 IEAT 许可、工程师认证以及环境审批作为一个统筹协调的整体计划，而非一系列彼此孤立的环节。对于大型中国企业集团而言，回报是实实在在的：一座全资工厂，坐落于成熟的工业基础之上，并享有进入东盟市场的优越通道。许可证只是入口——而周密的规划能让这道入口顺畅开启。

本文仅提供有关泰国工业法律的一般性信息，不能替代针对具体项目的专业法律意见。