For business owners, executives, and SME entrepreneurs who are planning to expand their production base or set up a new industrial factory. The first and most important stage is not a matter of designing a structure or selecting a machine, but is “choosing a land location that is legal” because in Thailand Space allocation is also controlled. Town Planning Act It clearly defines what types of land or each “color” can be used or what types of buildings can be built.

If you choose to buy land with the wrong zoning or location, not only will you be unable to obtain a factory operating license (R.N.4), but it could also result in the suspension of your entire construction project, leading to enormous business losses. In this article, Bliss Construction will take you on a deep dive and summarize all the legal aspects of “purple zoning”, which is a strategic area specifically for industrial purposes.

Getting to know "Purple Zone" zoning: What is it in legal terms?

In the land use plan according to the comprehensive city plan, "purple" is the symbol designated as "industrial and warehouse land." Its primary purpose is to allocate the area as an economic and production zone, preventing industrial activities from disturbing or polluting communities and residential areas. Generally, city planning laws classify purple land into sub-categories for appropriate area control, as follows:

1. Dark purple land (A.1): Industrial land.

This area is open to the establishment of almost all types of industrial plants, including large-scale industries with complex production processes or factories that may cause pollution (but must be managed according to environmental standards as stipulated by law). It also allows for the construction of warehouses, distribution centers, and fully integrated industrial facilities.

2. Purple zone land (A.2): Industrial estate land.

This area has been specially allocated for the establishment of "industrial estates" or industrial promotion zones, under the supervision and joint management of the Industrial Estate Authority of Thailand (IEAT). Area A.2 facilitates central utilities, wastewater treatment systems, and expedited permit applications through a one-stop service.

Types of industrial plants that are legally permitted to be built in purple zones.

Although land zoned purple is designated for factories, businesses still need to verify the type and size of factories (as per the list attached to the Ministry of Industry regulations). The industries that can safely be established in purple-zoned areas are as follows:

• Food Processing and Agriculture Industry: Processed food manufacturing plants, food packaging lines, and extraction of organic substances from nature.
• Automotive and Parts Industry: Vehicle assembly plants, metal parts manufacturing, and steel structure stamping.
• Electronics and Technology Industry: Computer assembly lines, semiconductor manufacturing plants, and clean rooms for IT equipment.
• Warehouse and Logistics: Building temperature-controlled warehouses (Cold Storage), smart warehouses supporting automation systems, and large-scale distribution centers.

Caution: Certain types of plants with high environmental or chemical hazards (e.g., large-scale mining operations or explosives manufacturing plants) may be restricted to construction only in industrial zones (Zone 2) with embedded safety systems. They cannot be built in isolation on Zone 1 land.

Limitations and exceptions to be aware of before deciding to buy land.

Simply looking at the "colors" on the city map is not enough to guarantee 100% safety for your investment. Project owners need to consider other building techniques and regulations to avoid future legal problems.

Calculation of clearance and setback distance around land boundaries (Setback Regulations)

Urban planning and building control laws strictly define "setback distances." For example, large factory buildings must have a setback distance from the boundary of other properties or from public roads in proportion to the building's height and size for safety and fire prevention purposes. This means that the actual land you purchased may not be able to be used for construction on 100% of the area.

Green Buffer Zone Standards

Modern factories located in purple zoning areas must allocate at least 10%–15% (depending on local and industrial estate regulations) as green space or buffer zones to help absorb dust, reduce noise, and minimize the visual impact on surrounding communities.

Summary Table: Comparison of purple-zoned land (A.1 & A.2) with other nearby zoning colors.

Guidelines for coordination and verification of eligibility before investment.

To ensure maximum confidence, before placing a deposit or purchasing land zoned purple, developers should proactively follow these steps:

1. Please check the city plan at the municipal office or the Department of Public Works: Bring your land plot map and title deed number to check the land use rights to ensure it is as current as possible (as the comprehensive city plan is constantly being updated and changed).
2. Consult engineers and architects early on: Having a turnkey construction company review the plans before purchasing the land will help you determine immediately whether the plot of land is suitable for your desired factory building.

Conclusion

Purple zoned land is key and serves as a gateway for building industrial factories and warehouses. However, purchasing purple zone land involves detailed regulations regarding building codes, setbacks, and environmental criteria that require careful consideration. Planning with industrial construction experts will help mitigate risks and ensure your investment is worthwhile and safe.

Bliss Construction We are a construction contracting company for factories, warehouses, and complete engineering systems. We provide consulting services and help entrepreneurs examine city plans. Ready to design a building plan that is 100% compliant with building control laws and factory laws to help your project get approved and open for operation quickly.

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