Does a Phuket Off-Plan Project Need Environmental Approval Before Selling Units?

Concise answer

Not every Phuket off-plan property project requires an Environmental Impact Assessment, and Thai law does not create a simple universal rule that every developer must obtain final EIA approval before advertising or accepting reservations.

However, when a project falls within a category, size or location requiring an Environmental Impact Assessment—or a Phuket-specific Initial Environmental Examination—the relevant environmental report and approval become essential to the project’s lawful permitting and construction.

Under the generally applicable national threshold, a condominium or other collective residential building normally requires an EIA when it has:

• At least 80 residential units or rooms; or
• At least 4,000 square metres of usable floor area.

Phuket is also subject to environmental-protection-area notifications that may impose additional restrictions, procedures or environmental-reporting requirements based on the project’s precise location and characteristics.

Therefore:

• “EIA pending” is not the same as “EIA approved.”
• Submission of an EIA does not guarantee approval.
• Environmental approval does not itself constitute a building permit.
• A building permit does not necessarily prove full environmental compliance.
• Approval for one design does not automatically cover a materially changed design.
• A project below the national EIA threshold may still require an IEE or compliance with Phuket-specific environmental controls.
• Sales activity does not prove the project is legally ready to be built.

A buyer considering a project without final environmental approval should treat the transaction as conditional. The reservation and sale agreement should provide a clear approval deadline, payment protection, disclosure of required design changes and a full refund if the project cannot obtain the approvals needed to build substantially as sold.

The Office of Natural Resources and Environmental Policy and Planning explains that residential buildings with at least 80 rooms or 4,000 square metres of usable area fall within the EIA requirement, and that consumers can check project status through the government’s Smart EIA Plus database. ONEP consumer guidance on property projects and EIA

Detailed explanation

1. Environmental approval and permission to sell are different questions

A buyer should separate:

1. Whether the developer may advertise or accept a reservation.
2. Whether the project requires an EIA or IEE.
3. Whether the environmental report has been submitted.
4. Whether the report has been approved.
5. Whether all approval conditions have been incorporated into the design.
6. Whether a valid building permit has been issued.
7. Whether construction is proceeding in accordance with those approvals.
8. Whether the completed development can be registered and transferred as promised.

A sales launch may occur before all these stages have been completed.

Consequently, the fact that a project is:

• Advertised publicly
• Represented by agents
• Accepting reservations
• Collecting instalments
• Operating a sales gallery
• Displaying architectural models
• Clearing the site

does not prove final environmental approval or construction readiness.

2. Not every project requires a national EIA

Environmental-reporting obligations depend on matters including:

• Type of development
• Number of units or rooms
• Usable floor area
• Building height
• Total building area
• Hotel component
• Location
• Environmental-protection-area classification
• Proximity to sensitive resources
• Project phasing
• Connected land plots
• Actual integrated use of the development
• Current ministerial notifications

A small villa project may not meet the national EIA threshold but can still be subject to:

• Phuket environmental-protection measures
• Initial Environmental Examination requirements
• Building-control restrictions
• Land-development licensing
• Slope and elevation restrictions
• Coastal setbacks
• Drainage and wastewater requirements
• Forest or protected-land controls
• Road-access requirements
• Local planning regulations

“No EIA required” should never be interpreted as “no environmental or development controls apply.”

3. The commonly applicable residential threshold

ONEP’s published consumer guidance identifies residential buildings requiring an EIA as those containing:

• At least 80 rooms or units; or
• At least 4,000 square metres of usable floor area.

The tests are alternatives. A project may require an EIA even if only one threshold is met.

For example:

The figures in marketing material should not be accepted without examining the approved plans and legal calculation method.

4. The threshold is not determined only by the word “condominium”

A development may be described commercially as:

• Residence
• Branded residence
• Serviced apartment
• Investment residence
• Resort residence
• Condotel
• Hotel residence
• Pool-villa estate
• Managed residence
• Private club
• Mixed-use resort

The marketing description does not control the legal classification.

The authorities may consider:

• Approved building use
• Number and arrangement of rooms
• Intended operation
• Hotel services
• Separate or connected buildings
• Common facilities
• Land ownership and boundaries
• Construction plans
• Applications submitted by the developer

A project marketed as villas could still contain legally relevant collective-residential, hotel or other components.

5. Phuket has location-specific environmental controls

Phuket is an environmentally sensitive island with coastal areas, hillsides, watersheds, forest areas, beaches and marine resources.

In addition to Thailand’s general EIA regime, Phuket is subject to environmental-protection-area measures. ONEP currently lists:

• The 2024 notification establishing environmental-protection areas and measures in Phuket
• The 2025 notification governing IEE and EIA preparation procedures within Phuket’s environmental-protection areas

These controls can affect:

• Permitted land use
• Building height
• Distance from the shoreline
• Slope development
• Site coverage
• Open space
• Wastewater treatment
• Drainage
• excavation
• Environmental reporting
• Construction methods
• Visual impact
• Protection of natural resources

The precise land location must be plotted against the applicable official maps and zones. ONEP’s environmental-protection notifications

6. An IEE may apply even when a full EIA does not

An Initial Environmental Examination is a different level of environmental review.

Depending on the applicable Phuket notification and the project’s location, type and size, a project that falls below a national EIA threshold may still require an IEE.

The buyer should therefore ask:

• Does the project require a full EIA?
• Does it require an IEE?
• Has an environmental authority confirmed that neither is required?
• Which provision and project measurements support that conclusion?
• Does the answer cover all phases and facilities?

A developer’s statement that “the project is too small for EIA” does not necessarily answer the IEE question.

7. A written professional determination is preferable

Where the developer claims no EIA or IEE is required, the buyer should request:

• Written opinion from the project’s licensed environmental consultant
• Applicable legal threshold
• Unit-count calculation
• Usable-area calculation
• Site map
• Phuket environmental zone
• Confirmation of project classification
• Confirmation of all phases included
• Correspondence with the relevant authority
• Building-permit authority’s position

The buyer’s independent lawyer and technical adviser should review the determination.

8. “EIA submitted” means only that a process has started

A project may be marketed as:

• EIA submitted
• EIA in process
• EIA under consideration
• EIA expected shortly
• EIA pre-approved
• EIA conditionally accepted
• EIA passed in principle
• EIA approved

These expressions are not interchangeable.

“Submitted” may mean the report is awaiting:

• Completeness review
• Technical assessment
• Expert-committee review
• Additional information
• Design revisions
• Public-participation work
• Resubmission
• Final notification of approval

The buyer should request documentary proof of the exact official status.

9. Submission does not guarantee approval

An environmental report may identify problems involving:

• Wastewater capacity
• Water supply
• Traffic
• Access roads
• Drainage
• Flooding
• Slope stability
• Excavation
• Retaining structures
• Noise
• Dust
• Construction impacts
• Coastal resources
• Visual impact
• Community objections
• Building density
• Emergency access
• Cumulative effects with nearby projects

The reviewing committee may require the developer to:

• Amend the report
• Commission further studies
• Redesign the project
• Reduce environmental impacts
• Add mitigation measures
• Clarify technical calculations
• Conduct further consultation
• Resubmit the proposal

Approval should never be assumed merely because the developer has paid a consultant to prepare a report.

10. EIA approval is usually tied to a particular project design

The reviewed report ordinarily describes defined project characteristics, including:

• Land plots
• Project owner
• Building locations
• Number of buildings
• Number of units or rooms
• Building heights
• Floor areas
• Parking
• Roads
• Entrances
• Utilities
• Wastewater system
• Drainage
• Landscaping
• Common facilities
• Construction programme
• Environmental mitigation measures

A buyer should compare those characteristics with the development being sold.

Approval for a 200-unit project is not necessarily approval for a later 280-unit scheme.

11. Approval may contain binding environmental measures

EIA approval is not simply a one-page certificate allowing the developer to proceed without further obligations.

The report and approval may require measures covering:

• Construction-hour limits
• Dust suppression
• Noise control
• Truck routes
• Waste disposal
• Sediment control
• Stormwater
• Wastewater treatment
• Water-quality testing
• Green areas
• Tree preservation
• Energy conservation
• Traffic management
• Community complaints
• Monitoring reports
• Operational maintenance

These measures can affect the project’s cost, design, common expenses and long-term management.

12. Buyers should inspect the approval conditions

An approval letter may refer to:

• The submitted report
• Revised report
• Additional documents
• Expert-committee resolution
• Mitigation measures
• Monitoring obligations
• Conditions for construction and operation

A sales representative’s statement that the project “passed EIA” does not explain those conditions.

The buyer should request:

• Approval or concurrence letter
• Approval date
• Official reference number
• Expert-committee resolution
• Final approved project description
• Material mitigation commitments
• Latest approved amendments
• Monitoring obligations

13. EIA approval does not equal a building permit

Environmental approval and building permission serve different purposes.

An EIA approval does not by itself prove:

• The project has a valid building permit
• Plans comply with building-control law
• Road access is sufficient
• Height is lawful
• All setback rules are satisfied
• The developer owns the land
• Construction financing is available
• Land-development permission has been obtained
• The condominium can be registered
• Hotel operation will be licensed
• Units can be transferred to buyers

The developer generally still requires the relevant construction and development permissions.

14. A building permit should not replace EIA verification

The reverse assumption is also unsafe.

A buyer should not conclude that a displayed building permit necessarily proves:

• The entire project has final EIA approval
• The permit matches the approved EIA design
• Later amendments were approved
• All phases are covered
• Construction complies with environmental conditions
• The permit remains valid
• The copy shown is complete and authentic

Both approval tracks should be independently verified.

15. Construction should not proceed contrary to an applicable EIA requirement

ONEP explains that a project required to complete an EIA may be unable to obtain permission to construct or proceed with the applicable development approval if the EIA does not pass.

If construction has started while required environmental approval remains unresolved, buyers should investigate:

• What work is occurring
• Whether it is preliminary or structural work
• What permit authorises it
• Whether the permit covers the work observed
• Whether the EIA has actually been approved
• Whether an exemption is claimed
• Whether authorities have issued any stop-work order
• Whether neighbours have challenged the project

Visible activity on the land is not proof of lawful construction.

16. Early site works can create a misleading impression

Before full construction, a developer may undertake:

• Fencing
• Surveying
• Soil testing
• Vegetation clearance
• Demolition
• Earthworks
• Sales-office construction
• Access preparation
• Utility relocation
• Show-unit construction

These activities can make the project appear further advanced than its approval status.

The buyer should verify what each permit actually authorises.

17. The sales gallery is not necessarily the approved project

A showroom or model may display:

• Exact sea views
• Rooftop pool
• Beach club
• Restaurant
• Additional floor
• Expanded balconies
• Large landscaped areas
• Private road
• Direct beach access
• Hotel facilities
• Separate phase

Those elements may not all appear in the environmentally approved design.

The sale contract should identify the plans and specifications forming part of the legal bargain.

18. Approval can require material redesign

To obtain approval, a developer may need to change:

• Unit count
• Building height
• Building position
• Floor plans
• Parking
• Entrance
• Common facilities
• Swimming pool
• Landscape area
• Retaining walls
• Wastewater plant
• Drainage
• Service areas
• Construction schedule

A redesign may affect a buyer’s:

• View
• Privacy
• Access
• Unit layout
• Balcony
• Natural light
• Noise exposure
• Rental appeal
• Common fees
• Resale value

The contract should distinguish minor technical adjustments from material changes requiring buyer consent.

19. “Equivalent replacement” language can be dangerous

Some agreements permit the developer to alter plans or substitute facilities whenever required by authorities.

An excessively broad clause may allow the developer to argue that the buyer must accept:

• Different floor plan
• Reduced balcony
• Obstructed view
• Relocated unit
• Removed facility
• Additional building
• Different access
• Smaller common area
• Changed project concept

The buyer should negotiate the right to terminate and obtain a refund if required approvals cause a material adverse change.

20. Project phasing requires careful examination

A large development may be divided into:

• Phase 1
• Phase 2
• Separate buildings
• Separate development companies
• Separate land titles
• Condominium and hotel components
• Villas and apartments
• Common central facilities

The environmental assessment should be reviewed against the actual integrated development.

Questions include:

• Were all phases assessed together?
• Are later phases dependent on the same infrastructure?
• Do phases share access, drainage or wastewater systems?
• Is the advertised master plan larger than the assessed project?
• Are future buildings disclosed in the EIA?
• Could future construction affect the buyer’s view or facilities?

Separate sales names do not necessarily make physically connected projects environmentally independent.

21. Project splitting should not be assumed to avoid assessment

A developer should not simply divide an integrated project into smaller nominal phases to avoid an applicable environmental threshold.

Whether the authorities treat phases separately may depend on:

• Common ownership
• Contiguous land
• Shared access
• Shared infrastructure
• Common design
• Construction timing
• Commercial presentation
• Functional integration
• Applicable legal provisions

A buyer should be cautious where several adjacent phases each appear just below a threshold.

22. Mixed-use projects need broader review

A Phuket development may contain:

• Condominium
• Hotel
• Retail
• Restaurants
• Beach club
• Spa
• Marina
• Offices
• Villas
• Staff accommodation

Different components may fall within different environmental categories or collectively affect the assessment.

The buyer should confirm that the environmental report covers the development actually being marketed—not merely one selected component.

23. A condominium-hotel conversion can create further risk

A project approved as residential accommodation may later be marketed for:

• Hotel operation
• Daily rental
• Guaranteed returns
• Resort management
• Short-stay guests
• Pooled rental programme

That operating model may differ from the assessed and permitted use.

Buyers should confirm:

• Approved building use
• Environmental-report classification
• Hotel-licence route
• Condominium registration plan
• Rental restrictions
• Wastewater and parking capacity
• Management structure

Environmental approval does not automatically legalise hotel operation.

24. A later material change may require further approval

After EIA approval, the developer may seek changes to:

• Project owner
• Land plots
• Buildings
• Unit count
• Floor area
• Height
• Facilities
• Infrastructure
• Mitigation measures

Depending on materiality and applicable procedure, the change may require notification, amendment, further review or new approval.

The buyer should request the latest approved version—not only the original approval letter.

25. The developer’s name must match the project records

Environmental records should be compared with:

• Reservation agreement
• Sale and purchase agreement
• Landowner
• Building-permit applicant
• Construction company
• Marketing company
• Future condominium developer
• Payment recipient

A difference may be legitimate, but it should be explained and documented.

A marketing brand is not necessarily the legal project owner.

26. A change of project owner needs investigation

If environmental approval was obtained by another entity, the buyer should determine:

• Whether approval remains applicable
• Whether the change was reported
• Whether rights and obligations transferred
• Whether the new entity owns or controls the land
• Whether mitigation obligations remain enforceable
• Whether building and land-development permits were updated

A corporate acquisition does not automatically cure permit or environmental defects.

27. The Smart EIA Plus database is an important verification source

ONEP operates Smart EIA Plus as the government information centre for IEE, EIA and EHIA reports.

The database can show information such as:

• Project name
• Project category
• Location
• Project owner
• Report consultant
• Approval reference
• Approval date
• Available project status
• Related approval or monitoring documents

Buyers can search the Smart EIA Plus database.

A search result should still be compared with the exact project because names, ownership and designs can change.

28. Failure to find a project is not conclusive

A missing database result could mean:

• No report was submitted
• Project uses a different Thai name
• Developer’s legal entity differs from the sales brand
• Search spelling is incorrect
• Report is recorded under an earlier name
• Database entry is incomplete
• Project falls outside the relevant requirement
• Submission is at an early stage
• Different phase or land parcel was assessed

The buyer should ask the developer for the official reference number and obtain independent confirmation.

29. “EIA approved” advertising should be substantiated

Where advertising uses an “EIA Approved” statement or logo, the buyer should verify:

• Exact project name
• Approval reference
• Approval date
• Land location
• Developer
• Number of units
• Number of buildings
• Approved facilities
• Approval conditions
• Subsequent amendments

The label should not be accepted as proof that every image or promise in the advertisement was approved.

30. Approval can become commercially important even before construction

Although environmental law generally focuses on assessment and permitting rather than creating a universal ban on pre-approval sales, unresolved approval creates substantial buyer risk.

A project may:

• Never receive approval
• Receive approval only after major redesign
• Lose commercially important facilities
• Require more capital
• Experience prolonged delay
• Face objections or litigation
• Become financially unviable
• Refund buyers late
• Lack sufficient funds to refund buyers

Therefore, buying before approval is not merely an administrative timing issue.

31. The reservation should identify the approval status accurately

Before paying, the buyer should require a written statement confirming whether the project is:

• Not required to obtain EIA or IEE
• Preparing an environmental report
• Submitted and awaiting review
• Required to revise and resubmit
• Approved subject to conditions
• Fully approved for the design being sold
• Seeking approval for an amendment

Ambiguous phrases such as “EIA underway” should be replaced with verifiable facts.

32. The reservation should be conditional where approval is outstanding

A buyer may require the reservation to state that:

• The purchase is subject to specified environmental approval.
• Approval must cover the substantially advertised design.
• Buyer is not obliged to sign an unconditional sale agreement before approval.
• Further payments are suspended if approval is delayed.
• Buyer receives all material approval-driven changes.
• Buyer may reject material changes.
• Reservation fee is fully refundable if approval is not obtained by the deadline.
• Refund is due within a defined period.
• No administration deduction applies where the developer cannot obtain approval.

The wording should be reviewed by an independent Thai lawyer.

33. A longstop date is essential

The contract should not allow environmental approval to remain pending indefinitely.

The longstop clause should address:

• Approval required
• Deadline
• Extension conditions
• Maximum extension
• Buyer’s termination right
• Refund deadline
• Interest
• Bank charges
• Currency implications
• Documents required for refund
• Survival of buyer claims

A vague promise that approval will arrive “soon” provides little protection.

34. Payments should reflect approval risk

If environmental approval is outstanding, the buyer should consider limiting exposure.

A safer structure may involve:

• Small refundable reservation
• No large deposit before approval
• Instalments linked to objective milestones
• Independent escrow where legally and practically available
• Payment only to the contracting entity
• Written receipts
• Clear refund security
• Right to suspend payments
• Final payment only when transfer requirements are satisfied

Large upfront payments transfer much of the approval risk to the buyer.

35. A refund promise is only as strong as the developer’s finances

Even a well-written refund clause may be difficult to enforce if the developer:

• Has spent buyer funds
• Has mortgaged the land
• Has substantial creditor claims
• Lacks working capital
• Uses a thinly capitalised project company
• Transfers funds to related parties
• Becomes insolvent
• Disputes termination

Environmental due diligence should therefore be combined with corporate, land-title, mortgage and financial due diligence.

36. Approval delay and construction delay are connected

Environmental review may affect:

• Building-permit date
• Contractor mobilisation
• Financing drawdown
• Presales
• Construction commencement
• Completion date
• Condominium registration
• Transfer date
• Rental-income commencement

The promised completion date should be realistic in light of the project’s actual approval stage.

37. Buyer delay remedies should cover environmental causes

A developer may try to classify authority review as an event beyond its control.

The buyer should examine whether the contract permits the developer to extend completion for:

• EIA review
• IEE review
• Authority requests
• Design revisions
• Community objections
• Permit delay
• Changes in law
• Court proceedings

Not every approval delay should automatically excuse unlimited developer delay, particularly where the developer sold the project knowing approval was outstanding.

38. Environmental approval does not guarantee completion

Even after approval, the project can still fail because of:

• Insufficient financing
• Land mortgage
• Ownership dispute
• Invalid access
• Building-permit problem
• Contractor failure
• Cost escalation
• Developer insolvency
• Market conditions
• Planning restrictions
• Failure to comply with approval conditions

“EIA approved” is positive due-diligence evidence, not a completion guarantee.

39. Approval does not guarantee the buyer’s promised view

Environmental review may consider visual effects, but it does not create a private guarantee that:

• Sea view will remain unobstructed
• Neighbouring land will remain undeveloped
• Trees will remain
• Future phases will not be built
• Building orientation will stay unchanged
• Public infrastructure will not change

View protection must be assessed through plans, contracts, surrounding-land research and applicable development restrictions.

40. Environmental measures can affect common fees

Required systems may include:

• Wastewater-treatment plant
• Water-quality monitoring
• Pumps
• Drainage systems
• Landscaping
• Environmental consultants
• Waste management
• Noise-control equipment
• Energy systems
• Maintenance reporting

The future condominium juristic person may bear operating and maintenance costs.

Buyers should examine whether projected common fees realistically account for these obligations.

41. Compliance continues after approval

Environmental responsibility does not end when an EIA is approved.

The project may have ongoing duties during:

• Site preparation
• Construction
• Commissioning
• Operation
• Maintenance

Smart EIA Plus also maintains information concerning monitoring reports. Buyers and future owners should understand who will perform and pay for post-completion obligations.

42. Neighbour objections should be investigated

Community concerns may involve:

• Access
• Traffic
• Noise
• Dust
• Drainage
• Flooding
• Slope stability
• Beach access
• Wastewater
• Construction hours
• Loss of views
• Natural-resource impacts

An objection does not automatically mean the project is unlawful. However, serious unresolved disputes may affect approval, construction or litigation risk.

The buyer should ask whether there are:

• Administrative complaints
• Stop-work orders
• Court cases
• Local-authority disputes
• Neighbour negotiations
• Environmental petitions

43. Hillside developments require enhanced scrutiny

For a Phuket hillside project, the buyer should investigate:

• Land elevation
• Slope
• Excavation
• Retaining walls
• Soil stability
• Drainage
• Runoff
• Access gradient
• Emergency vehicles
• Height measurement
• Cut-and-fill works
• Landslide risk
• Environmental zone
• Approved engineering design

A panoramic view should not distract from the site’s construction and regulatory risks.

44. Coastal projects require separate verification

For a coastal or beachfront project, due diligence may include:

• Shoreline measurement
• Applicable setback
• Beach and public-land boundaries
• Coastal erosion
• Marine impacts
• Wastewater discharge
• Public access
• Building height
• Environmental zone
• Land-title history
• Encroachment
• Protected-resource restrictions

EIA approval does not itself establish private ownership of the beach or guarantee permanent beachfront conditions.

45. Buyers should verify the wastewater plan

Wastewater is particularly important in island development.

The buyer should ask:

• What treatment system is approved?
• What capacity was used in the calculation?
• Does it cover all units and facilities?
• Where will treated water go?
• Who will operate the system?
• What monitoring is required?
• What will maintenance cost?
• Are later phases included?
• Is the operational arrangement reflected in common-fee projections?

A project’s pool, landscaping, restaurants and hotel activities can materially increase demand on water and wastewater infrastructure.

46. Independent professional review is essential

The buyer’s lawyer and technical advisers should verify:

• Land titles
• Environmental zone
• Project classification
• Applicable EIA or IEE requirement
• Unit and area thresholds
• Project phasing
• Smart EIA Plus record
• Approval letter
• Expert-committee resolution
• Approved report and design
• Approval conditions
• Environmental mitigation measures
• Building permit
• Land-development licence
• Access
• Utilities
• Wastewater
• Project ownership
• Land mortgage
• Contract representations
• Payment milestones
• Longstop date
• Refund rights
• Material-change rights
• Construction status
• Litigation or objections

Environmental review should form part of the wider legal and technical due diligence—not operate as a substitute for it.

Environmental-approval outcome comparison

Practical buyer checklist

Before reserving a Phuket off-plan project, the buyer should:

1. Obtain the project’s full legal name.
2. Identify the project-owning company.
3. Identify the landowner.
4. Obtain copies of all relevant land titles.
5. Confirm the development’s exact location.
6. Plot the land against the applicable Phuket environmental-protection zones.
7. Confirm the legal project classification.
8. Confirm the number of units or rooms.
9. Confirm the legally calculated usable floor area.
10. Determine whether a national EIA is required.
11. Determine whether a Phuket-specific IEE is required.
12. Request written reasons if the developer claims neither is required.
13. Search Smart EIA Plus.
14. Search using the Thai project name.
15. Search using the project company’s name.
16. Search previous project names.
17. Obtain the official submission reference.
18. Confirm the current review status.
19. Obtain the EIA or IEE approval letter.
20. Confirm the approval date.
21. Confirm the approved land plots.
22. Confirm the approved project owner.
23. Confirm the approved number of buildings.
24. Confirm the approved number of units.
25. Confirm approved building heights.
26. Confirm approved common facilities.
27. Review material approval conditions.
28. Review environmental mitigation commitments.
29. Confirm whether amendments have been submitted.
30. Compare the approved design with the sales plans.
31. Check whether all phases were assessed.
32. Check any hotel or commercial component.
33. Obtain the building permit.
34. Compare the building permit with the environmental approval.
35. Confirm whether construction has lawfully commenced.
36. Investigate complaints, objections and litigation.
37. Review wastewater and drainage systems.
38. Review hillside, slope and retaining-wall issues.
39. Review shoreline and coastal restrictions where relevant.
40. Confirm future environmental-monitoring obligations.
41. Estimate the effect on future common fees.
42. Make the reservation conditional if approval is outstanding.
43. Limit payments before approval.
44. Establish an approval longstop date.
45. Require written notification of design changes.
46. Preserve the right to reject material changes.
47. Require a full refund if necessary approval is refused.
48. Specify the refund deadline.
49. Avoid relying exclusively on the sales agent’s assurances.
50. Obtain independent Thai legal and technical advice before making substantial payments.

Greg’s professional perspective

Environmental approval is often reduced to a sales slogan: “EIA Approved.” For a buyer, the real question is not whether those words appear on a brochure. It is whether the approval covers the land, developer, buildings, unit count, facilities and design being sold.

Before recommending an off-plan Phuket project, I want clear answers to seven questions:

1. Does this exact project require an EIA, an IEE or neither?
2. What official provision and project measurements support that answer?
3. If approval is required, what is its current documented status?
4. Does the approved design match the sales presentation?
5. What material conditions or mitigation measures apply?
6. What happens to the buyer’s money if approval is delayed or refused?
7. Can the buyer terminate if approval requires a materially different project?

Selling before final approval is not automatically the same as building unlawfully, but it can transfer a major part of the development risk to the buyer. A buyer should not finance an uncertain approval process without clear contractual protection.

I would be particularly cautious where a developer says that EIA approval is “only a formality.” Environmental review may affect the building’s size, height, access, drainage, wastewater system, landscaping, facilities and construction timetable. Those are fundamental features of the product being purchased.

The proper approach is to verify the approval independently, compare it with the promised project and ensure the contract contains a realistic longstop date and refund mechanism.

Phuket Realtor helps buyers distinguish a marketable concept from an environmentally approved and buildable development. That is part of helping clients Invest with Confidence.

Applicable date

Current as reviewed on: 8 September 2026

Thailand’s national EIA notifications, Phuket environmental-protection measures and local implementation procedures may change.

ONEP published a 2024 Phuket environmental-protection-area notification and a 2025 notification concerning the preparation of IEE and EIA reports within Phuket’s protected areas. ONEP was also consulting during 2026 on a proposed amendment to the Phuket measures. A consultation draft should not be treated as enacted law unless and until the final notification is formally issued and effective.

This entry should be reviewed after any new Royal Gazette publication, ONEP notification, court decision or administrative change affecting environmental assessment or Phuket development controls.

Location and property types

Location: Phuket, Thailand
Primary property types: Off-plan condominiums, villa estates, collective residential buildings, hotels, branded residences and mixed-use developments
Development stages: Reservation, presale, environmental assessment, permitting, construction and completion
Buyer type: Foreign and Thai purchasers, investors, retirees and holiday-home buyers
Primary risk: Purchasing before confirming that the development has obtained—or can realistically obtain—the environmental approvals required to build substantially as sold

Verified legal and authoritative sources

• Enhancement and Conservation of National Environmental Quality Act B.E. 2535 (1992), as amended — provides the principal statutory framework for environmental assessment in Thailand.
• Section 48 of the amended environmental legislation — supports ministerial notifications specifying the projects, activities and operations requiring environmental-impact reports.
• Ministry of Natural Resources and Environment Notification B.E. 2566 (2023) concerning projects requiring an EIA — current national notification identifying regulated project categories, thresholds and reporting procedures.
• Ministry of Natural Resources and Environment Notification B.E. 2567 (2024) establishing environmental-protection areas and measures in Phuket — location-specific environmental framework applicable within Phuket.
• Ministry of Natural Resources and Environment Notification B.E. 2568 (2025) concerning IEE and EIA preparation within Phuket environmental-protection areas — Phuket-specific environmental-reporting procedures.
• ONEP consumer guidance concerning EIA and property projects — identifies the 80-room and 4,000-square-metre residential thresholds and directs consumers to the government database.
• Smart EIA Plus — official ONEP database for searching IEE, EIA, EHIA and monitoring-report information.
• ONEP ministerial-notification directory — official collection that includes the current national EIA and Phuket environmental-protection notifications.
• Building Control Act B.E. 2522 (1979), as amended — governs building permits and construction controls separately from environmental approval.
• Land Development Act B.E. 2543 (2000), as amended — relevant where a development constitutes regulated land allocation.
• Phuket provincial and local authorities — responsible for relevant building, planning and local administrative permissions.
• Office of Natural Resources and Environmental Policy and Planning — national authority maintaining the environmental-assessment framework and Smart EIA Plus information.
• Royal Gazette — definitive publication source for enacted ministerial notifications and amendments.

Related questions

• What is an EIA in Thailand?
• What is the difference between an EIA and an IEE?
• Which Phuket condominium projects require an EIA?
• Is the EIA threshold based on units or floor area?
• Can a developer sell units before EIA approval?
• Can a developer start construction while EIA approval is pending?
• Does “EIA submitted” mean the project has been approved?
• How can a buyer verify a project’s EIA status?
• What information appears in Smart EIA Plus?
• What happens if a Phuket project fails its EIA?
• Can the developer change the design to obtain EIA approval?
• Can the buyer cancel if the approved design is different?
• Does EIA approval guarantee a building permit?
• Does a building permit prove EIA approval?
• Can an approved project add more units later?
• Does each project phase require separate approval?
• Can a developer split a project to avoid EIA requirements?
• Do small Phuket villa projects require an IEE?
• What environmental rules apply to Phuket hillside developments?
• What environmental rules apply to beachfront projects?
• Does EIA approval guarantee legal hotel operation?
• Are wastewater-treatment obligations included in an EIA?
• Can environmental measures increase condominium common fees?
• What should an EIA condition in a reservation agreement say?
• Should buyers pay large instalments before EIA approval?
• What refund rights should apply if approval is refused?
• How does environmental delay affect the completion date?
• Can an EIA approval be transferred to a different developer?
• What happens if the developer materially changes an approved project?
• How should a buyer investigate environmental complaints or litigation?

Knowledge-catalog administration

Disclaimer

This entry provides general educational information and does not constitute legal, environmental, planning, engineering, construction, property, investment or financial advice.

Whether a particular Phuket development requires an EIA, IEE or other environmental process depends on the law and ministerial notifications in force, the project’s location, classification, size, design, land plots, phasing and proposed operation. Database information and developer documents should be verified against official records and the final approved plans.

Buyers should obtain case-specific advice from qualified independent Thai legal and technical professionals before signing an unconditional agreement or transferring substantial funds.