Can we confirm our factory class before committing to a site?

Yes, and you should. Classification depends on factors including installed machine power and the number of workers, and it determines which approval track applies and how heavy the obligations are. Confirming the likely class before signing a lease or a land contract costs very little; discovering after signing that the site or the building does not suit your class is expensive and sometimes unfixable. Bring us the machinery list and headcount plan and we confirm the class against your actual configuration.

We are buying an existing plant. Does its licence come with it?

Do not assume it does. Whether an existing licence can be transferred, and what has to be done to effect it, depends on the licence and on the structure of your deal — buying the company that holds the licence is a different question from buying the plant and land. This is one of the most common causes of a brownfield acquisition missing its production date, because the licensing work is discovered after the sale and purchase agreement is signed rather than during diligence.

What counts as a modification requiring fresh approval?

More than most operators expect. Adding lines, changing machinery, raising installed capacity, changing the process or introducing new inputs can each require approval, even where the building footprint does not change. The practical risk is incremental: a series of small changes, none of which felt like a licensing event at the time, that together put the plant outside what was approved. The time to check is before the machinery is ordered, not after it is installed.

What happens if there is a complaint from the community or an adverse inspection finding?

Complaints and inspections are a normal part of operating and are usually resolved at the operational level, but an adverse decision can carry consequences up to suspension of operations. Two things determine how it goes: whether your records demonstrate compliance at the time in question, and whether you respond within the period allowed. An adverse decision can generally be challenged, but the routes and deadlines are strict, so it is not a matter to leave with the plant manager alone.

How do licensing, land, building permits, environmental assessment and BOI fit together?

They are separate approvals that constrain each other, and the failure mode is almost always sequencing rather than any single refusal. A building permit sought before the factory position is settled, or machinery ordered before classification is confirmed, creates dependencies that then have to be unwound. Map all of them onto one timeline at the start and identify which approvals block which — that single exercise saves more schedule than any individual application being handled quickly.

Your Factory Licence in Thailand: Starting, Expanding, Relocating or Taking Over a Plant

Q: What single fact most changes our licensing timeline?

Whether the site sits inside a promoted industrial estate or outside it. Inside an estate, the estate authority is your counterpart and much of the process is consolidated, which is why estates are attractive to foreign manufacturers despite the land cost. Outside, you deal with the industry regulator and the local authority separately, and the sequencing of approvals becomes your problem to manage. The same plant, the same machinery and the same investment can produce materially different timelines depending on which side of that boundary the land sits.

The question that sets your whole timeline

Before anything else about permits, one fact drives your schedule more than any other: is the site inside a promoted industrial estate, or outside it?

Inside an estate, the estate authority is your counterpart and much of the process is consolidated. Outside, you deal with the industry regulator and the local authority separately and manage the sequencing yourself.

Same plant, same machinery, same investment — materially different timelines.

This guide is for the plant manager, country manager or COO about to sign a lease or a land contract, and for the acquirer in a brownfield deal who needs to know whether the target's licence survives.

General information only, not advice on a specific matter. Classification thresholds, fees and validity periods are set by regulation and change — we confirm your position against your actual configuration before you commit.

1. Estate or non-estate

Inside an estate: a single authority, land already zoned and serviced for industry, utilities and effluent infrastructure in place, and a process built for manufacturers. You pay for that in land cost.

Outside an estate: cheaper land, more freedom on location — and you carry the coordination. Zoning, the industry regulator, the local authority, utilities and effluent all have to be lined up by you, and any one of them can become the critical path.

Neither is right in the abstract. What is wrong is choosing the land first and discovering the implications afterwards.

2. Confirm your factory class before you sign

Factories are classified by reference to factors including installed machine power and the number of workers. The class determines which approval track applies and how heavy the ongoing obligations are.

Confirming the likely class costs very little. Discovering after signing that the site, the building or the location does not suit your class is expensive, and occasionally unfixable.

Bring the machinery list and the headcount plan before you sign anything. Not after.

3. New build versus taking over an existing plant

For a brownfield acquisition, licensing belongs in diligence, not in post-completion integration.

Establish early:

Whether the existing licence can be transferred, and on what conditions
Whether your deal structure changes the answer — acquiring the licence-holding company is a different question from acquiring the plant and land
Whether the plant as operated today matches what was actually approved
Whether there are outstanding conditions, complaints or inspection findings attached to it
What your intended changes to the operation will require in their own right

The most common cause of a brownfield deal missing its production date is licensing work discovered after signing rather than during diligence.

4. What counts as a modification

More than most operators expect. Each of the following can require approval even where the building footprint does not change:

Adding or replacing production lines
Changing machinery, particularly where installed power changes
Raising capacity
Changing the process or introducing new inputs
Changing the use of parts of the site

The real risk is incremental. A series of small changes, none of which felt like a licensing event at the time, can together put the plant outside what was approved — and that is usually discovered during an inspection, a financing exercise or a sale, at the worst possible moment.

Check before the machinery is ordered, not after it is installed.

5. Sequencing everything else

Licensing does not sit alone. It interacts with:

Land or lease — and whether the site is properly zoned for your activity
Building permits — which depend on the factory position being settled
Environmental assessment — where required for your activity or scale
BOI promotion — which has its own timeline and conditions
Utilities and effluent — capacity and connection, which are lead-time items

The failure mode is almost never a refusal. It is sequencing: a permit sought before a prerequisite is settled, machinery ordered before classification is confirmed, or a lease signed before zoning is verified.

Map all of them onto one timeline at the start and identify which blocks which. That exercise saves more schedule than any single application being handled quickly.

6. Complaints, inspections and protecting the licence

Complaints and inspections are ordinary features of operating. Most resolve at the operational level. An adverse decision, however, can carry consequences up to suspension.

Two things determine the outcome:

Whether your records demonstrate compliance at the relevant time. Maintenance logs, emissions and effluent monitoring, waste manifests, worker safety records and the machinery register are what you will be judged on.
Whether you respond within the period allowed. These periods are short.

An adverse decision can generally be challenged, but the routes and deadlines are strict. This is not a matter to leave with the plant manager alone.

7. What we need to give you a timeline

The site — location, and whether it is inside an estate
The machinery list with installed power, and the headcount plan
The process description and the inputs used
For a brownfield deal: the target's existing licence, conditions and inspection history
Your target production date, and what is already contractually committed to it

With that we can tell you which track you are on, what blocks what, and where the schedule risk actually sits — which is usually not where the board assumes.

Summary

Situation	The first thing to establish
Choosing a site	Inside or outside an estate — it sets the timeline
Before signing a lease	Your likely factory class, from machinery and headcount
Buying an existing plant	Whether the licence transfers, and whether the plant matches what was approved
Adding lines or capacity	Whether it is a modification requiring approval — before ordering
Inspection or complaint	Whether your records evidence compliance, and the response deadline

In factory projects, schedule is money. Almost all of the schedule risk is in sequencing, and almost all of it is avoidable by mapping the approvals before committing to the land.

We advise foreign manufacturers on plant licensing, estate and non-estate siting, brownfield acquisitions and regulatory disputes. Initial consultation is free — call +66 92 254 2045 or send us the details. See also our factory and industrial estate guide and the industrial estate directory.

This guide is published by Suwanvara Law Firm — a Khon Kaen law firm established in 1986. General information only, not legal advice on a specific matter.