Short Answer
Do not treat an environmental consultant’s report—or the consultant’s professional licence—as proof that the project itself received the required environmental approval.
First determine whether the project required an environmental assessment. If it did, trace the approval chain:
required assessment → final report → authority approval → approved conditions → amendments → monitoring → current project
For projects subject to an Environmental Impact Assessment, Thailand’s Smart EIA Plus database can be a useful verification source, but it should be reconciled with the actual project file and the project as it exists today.
Why This Matters
An environmental file can look substantial while still being incomplete.
It may contain technical studies, laboratory results, maps, consultant licences and report-preparer certifications. Those documents can show that professional work was done without proving that the competent authority approved the project or that the current configuration remains within the approved scope.
For a buyer or lender, the key question is:
“Was this project approved, on what conditions, and is the project we are acquiring still the same project that was approved?”
Typical Scenario
A buyer or lender is reviewing an older operating property or development project.
The seller provides a historical environmental study prepared by a licensed consultant. The file shows who prepared the report, but the authority’s approval decision is not clear.
Management asks:
“Is this enough to clear environmental due diligence?”
No.
Practical Analysis
01Determine whether an assessment was legally required.
The answer depends on project type, size, location, capacity and the rules in force when the project was developed or later changed. For older projects, historical requirements may matter.
02Distinguish preparation from approval.
A properly prepared report does not prove it was formally submitted or approved. Recover the authority decision and confirm that the report in the file is the final approved version.
03Compare the approved project with the current project.
Later expansion, additional buildings, increased capacity, revised site layout or other material changes may require amendments or a further environmental process.
04Read the conditions, not only the approval letter.
Approval conditions can cover wastewater, traffic, noise, waste, community impact, monitoring and reporting. Some obligations continue throughout operation and therefore matter to the buyer.
05Check monitoring history.
Where ongoing environmental monitoring is required, review the submission history and any unresolved authority correspondence.
06Check changes of ownership or project status.
Where the environmental record identifies a specific project owner, entity or project configuration, confirm whether later ownership or project changes were formally recorded.
Environmental diligence should also be tied to the transaction remedy. If an approval or monitoring record is missing, the buyer should decide whether it needs the evidence before signing, before closing, through a seller warranty or as a post-closing action. The importance of the missing document depends on whether it affects legality of operation, future expansion, remediation cost or the lender’s willingness to fund.
The missing evidence should be priced and allocated.
What We Usually Look At
We review the applicable assessment threshold, final approved report, official approval decision, approval conditions, project drawings and capacity, subsequent amendments, expansion approvals, monitoring reports, authority correspondence and the current physical and operational configuration.
Common Traps
Common mistakes are treating the consultant’s licence as project approval, relying on a draft or incomplete report, finding an approval letter but not the conditions, and failing to compare the approved project with what actually exists today.
Practical Next Step
Prepare an environmental approval chronology:
project developed → assessment required? → report submitted → approval → conditions → amendments → monitoring → current configuration
If that chronology cannot be completed, identify the missing evidence before pricing, funding or closing the transaction.
Legal Sources
- Enhancement and Conservation of National Environmental Quality Act B.E. 2535 (1992), as amended, including sections 46–51 on environmental impact assessment.
- Current Ministry of Natural Resources and Environment / ONEP notifications prescribing projects or activities subject to EIA or EHIA requirements.
- Office of Natural Resources and Environmental Policy and Planning (ONEP), current EIA guidance and Smart EIA Plus project database.
- ONEP requirements and public guidance on environmental mitigation and monitoring reports where applicable.
General legal information only. Please seek advice on your specific facts. Laws and regulatory practice may change.