When setting up a factory or business in Thailand, understanding urban planning zoning regulations (ผังเมือง / City Plan) is critical. Zoning determines what type of activities are legally allowed on a piece of land, and choosing the wrong zone can delay or completely block your factory setup.
Thailand’s zoning system is color-coded. Each color represents permitted land use intensity, population density, and industrial activity.
Overview of Thailand Zoning Colors
Thailand’s zoning rules are governed by the Department of Public Works and Town & Country Planning (DPT) and enforced by local authorities.
Below is a simplified and practical explanation of the main zoning colors relevant to investors and manufacturers.
🟨 Yellow Zone – Low-Density Residential
Purpose:
- Low-density housing
Allowed activities:
- Detached houses
- Small home offices
- Limited community services
Restrictions:
- ❌ Factories are not allowed
- ❌ Warehouses and heavy logistics are prohibited
Investor note:
This zone is not suitable for any industrial or manufacturing activity.
🟧 Orange Zone – Medium-Density Residential
Purpose:
- Medium-density residential areas
Allowed activities:
- Townhouses
- Small commercial buildings
- Offices (non-industrial)
Restrictions:
- ❌ Factories not allowed
- ❌ Only very limited storage uses
Investor note:
Sometimes mistaken as “commercial-friendly,” but industrial licenses will not be approved here.
🟥 Red Zone – High-Density Residential & Commercial
Purpose:
- City centers and business districts
Allowed activities:
- Office buildings
- Shopping malls
- Hotels
- Service businesses
Restrictions:
- ❌ Manufacturing prohibited
- ❌ Environmental impact concerns are strict
Investor note:
Good for headquarters or sales offices, not for production.
🟪 Purple Zone – Industrial Zone (Critical for Factories)
Purpose:
- Industrial and manufacturing use
Allowed activities:
- Factories
- Warehouses
- Industrial utilities
- Worker dormitories (with approval)
Sub-categories:
- Purple (General Industrial)
- Purple with White Stripes – Heavy industry
- Purple with Dots – Specialized industry
Investor note:
✅ This is the preferred zone for factory setup
Most factory licenses (รง.4) require land to be in a purple zone.
🟦 Blue Zone – Government & Public Utilities
Purpose:
- Government and public infrastructure
Allowed activities:
- Government offices
- Schools
- Hospitals
- Infrastructure projects
Restrictions:
- ❌ Private factories not allowed
🟩 Green Zone – Rural & Agricultural
Purpose:
- Agriculture and environmental conservation
Allowed activities:
- Farming
- Agricultural processing (limited)
- Low-impact activities
Restrictions:
- ❌ Industrial factories generally prohibited
- ⚠ Some agro-processing may be allowed with strict conditions
Investor note:
Factories here often face strong local opposition and permit rejection.
🟫 Brown Zone – Special Development / Mixed Use
Purpose:
- Transitional or special development areas
Allowed activities:
- Mixed residential
- Commercial
- Light industrial (case-by-case)
Investor note:
Requires detailed review by local authorities. Riskier but sometimes flexible.
Industrial Estates vs City Zoning
Even if land is zoned correctly, industrial estates (นิคมอุตสาหกรรม) operate under separate regulations, such as:
- IEAT Industrial Estates
- BOI-promoted zones
- Free Trade Zones (FTZ)
These zones often:
- Simplify licensing
- Allow heavier industries
- Reduce environmental approval risk
Common Mistakes Investors Make
- Assuming land title alone is sufficient
- Ignoring zoning color overlays and updates
- Buying land before confirming factory license eligibility
- Confusing BOI approval with zoning approval
BOI promotion does NOT override zoning laws
Final Advice for Foreign Investors
Before purchasing or leasing land in Thailand:
- ✅ Check latest zoning map (not old copies)
- ✅ Confirm zoning color with local municipality
- ✅ Verify factory license eligibility (รง.4)
- ✅ Review environmental requirements (EIA / IEE)
Getting zoning wrong can cost months or years.
Hopefully this guide will provide you with some guidance when buying land in Thailand. If you want to know more about investment in Thailand, please refer to my other detailed guide. In addition to land related matters, there are also BOI applications, factory building knowledge and more. If you are looking for consultation services please see my “services” page. Feel free to call or email me to get your first consultation for free.