Developers and projects

What Is EIA in Thailand and How to Verify Environmental Approval

Environmental Impact Assessment (EIA) is required for certain property developments in Thailand. Learn which projects need approval, how to check their status through the official ONEP database, and what documents to req…

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Frequently asked questions

Environmental Impact Assessment (EIA) evaluates the potential environmental effects of a development. It examines factors such as water, traffic, noise and local ecosystems. Approval is mandatory for certain types of projects in Thailand. Buyers should verify the approval status because missing required clearance can delay construction and related permissions.

No. Requirements depend on the development type, size and location. Relevant residential building categories may require an EIA when they contain at least 80 units or have 4,000 square metres of usable floor area. Additional environmental restrictions can apply in sensitive locations. Each project must be assessed against the applicable regulations.

You can search the official Smart EIA Plus database maintained by ONEP. Use the project's registered Thai name or the applicant company's name. Check the review status, approval letter reference and approval date. Submission or acceptance of a report into the system should not be confused with final approval.

EIA approval confirms that the relevant environmental assessment has passed the required review process. A construction permit authorises building works under applicable construction regulations. Both may be required for a development. Buyers should verify each document separately and confirm that the approved details match the actual project.

Reservation arrangements depend on the project's circumstances and applicable requirements. If EIA approval is pending, review the agreement carefully before paying. Confirm the refund conditions if approval is refused, construction is delayed or the project changes materially. Large payments should be avoided until the relevant documents and contractual protections have been reviewed.

Changes affecting the approved project specifications or environmental impacts may require additional review or approval. The requirements depend on the nature of the modifications. Buyers should request updated plans and verify that the current development remains consistent with the relevant environmental approval.

Request the project company's registration details, land ownership documentation, construction permit and EIA approval information where applicable. Also review the selected unit's floor plan, reservation agreement, payment schedule, refund conditions and foreign ownership quota availability if purchasing under foreign freehold.