This guide is the checklist we actually use with buyers before they transfer any money. It is longer than most "due diligence" articles online because it includes two things most of them skip: nominee shareholder risk and land access rights. Both have derailed real purchases in Phuket, and both are avoidable if you check for them early.
If you have not already, read our guide on how foreigners can buy and own property in Phuket first, so the ownership structures referenced below make sense.
1. Verify the Land Title
Start here. Thailand has several classes of land document, and they are not interchangeable:
Chanote (Nor Sor 4 Jor): full title, GPS surveyed boundaries, the only document that gives outright ownership. This is what you want.
Nor Sor 3 Gor: confirmed possessory right, boundaries surveyed but not GPS mapped to the same standard. Can usually be upgraded to Chanote.
Nor Sor 3: weaker possessory right, unsurveyed boundaries shared with neighbors. Higher dispute risk.
Sor Kor 1: a claim, not a title. Should not be treated as purchasable land.
Key action: Pull the title deed at the local Land Office (Kromthidin) yourself, or through your lawyer, and check the back of the deed (the "Sor Sor" annotations) for restrictions, part-plot registrations, or pending transfers. Never rely on a copy supplied only by the seller or agent.
2. Check for Encumbrances
A clean-looking Chanote can still carry a mortgage, a court-registered lien, or a long-term lease that survives a sale. In Thailand, encumbrances attach to the land, not the owner, so they transfer to you if undiscovered.
Key action: Request a full land registry search at the Land Office. Ask specifically for the transaction history over the last 5 to 10 years. A property that changed hands rapidly among related parties is worth extra scrutiny.
3. Confirm Ownership and Transfer Rights
If the seller is an individual, confirm their ID matches the title. If the seller is a Thai company (common for villas), the due diligence gets more involved.
Key action: Pull the company's affidavit from the Department of Business Development, confirm the directors signing have authority under the company objectives, and check the shareholder register. This step overlaps directly with the next one, which is where most foreign buyers get exposed.
4. Watch for Illegal Nominee Shareholder Structures
This is the risk most checklists leave out, and it is the one that matters most. Thai law (the Foreign Business Act and the Land Code) restricts land ownership by foreigners. To get around this, some Thai companies are set up with Thai shareholders who hold shares on paper but contribute no capital and have no real control, while the foreign buyer runs everything behind the scenes. This is a nominee structure, and it is illegal.
If the company you are buying into, or being asked to set up, uses nominee shareholders, you are exposed on two fronts: the Land Department can order the land sold or the structure unwound, and you have no real legal recourse because the arrangement itself was unlawful from the start.
Key action: Ask your lawyer, in writing, to confirm that any Thai company involved in the purchase has genuine Thai shareholders who contributed real capital and exercise real control. If an agent tells you nominee structures are "standard practice and never enforced," treat that as a warning sign, not reassurance.
5. Verify Land Access and Servitude Rights
Common in Phuket villa purchases: the plot itself is clean, but the road leading to it crosses a neighboring plot that someone else owns. Without a registered servitude (a right of way recorded on the title), that neighbor can legally block access at any time, including after you have bought the property.
Key action: Confirm on the title deed and site plan whether access is via a public road or a private plot. If private, verify a servitude is registered on both the access plot's title and yours, not just promised verbally by the seller.
6. Understand Zoning Laws
Phuket's zoning color codes (residential, commercial, agricultural, conservation) determine what you can build or rebuild, and they do change, particularly near the coast and in areas affected by the 2020 to 2023 Environment Ministry building height and setback revisions.
Key action: Get a written zoning certificate from the Provincial Administration Office, and ask specifically whether any zoning changes are proposed or pending for the parcel.
7. Assess Environmental and Flood Risk
Coastal and low-lying inland plots in areas like Choeng Thale and parts of Rawai have flooded during monsoon season. Erosion is a real factor for beachfront land within roughly 30 meters of the high tide line, which also carries its own building restrictions.
Key action: Check the plot against Phuket's flood risk mapping (available through the Department of Disaster Prevention and Mitigation) and ask neighbors directly whether the specific plot has flooded in the last five years. Sellers rarely volunteer this.
8. Review Building Permits and Certificates
Unauthorized extensions, converted storage rooms, and pool additions without permits are common on resale villas. These can block your ability to get a certificate of occupancy transferred, or trigger fines.
Key action: Compare the as-built structure against the permitted building plan (Aor 1) at the local municipal office. Measure or have a surveyor confirm the built area matches what's registered.
9. Commission a Professional Property Inspection
Phuket's climate is hard on buildings. Termite damage, salt air corrosion on steel fixtures and railings, and mold in poorly ventilated bathrooms are the three most common findings on villa inspections.
Key action: Hire an independent inspector with Phuket-specific experience, not one recommended by the seller or listing agent. Ask for a written report covering structural elements, electrical load capacity, plumbing, and termite evidence specifically.
10. Evaluate Infrastructure and Utilities
Water pressure and reliability vary significantly by area in Phuket, and some developments rely on trucked water during dry season shortages. Internet speed also varies more than buyers expect outside the main tourist corridors.
Key action: Ask for the last 12 months of utility bills if available, and test water pressure and internet speed in person during a site visit, ideally during dry season (roughly December to April) when demand peaks.
11. Research the Neighborhood and Future Developments
A large new development, a road widening project, or a rezoning nearby can change both your quality of life and your resale value.
Key action: Check with the local planning office (Or Bor Tor) for approved projects within a few hundred meters, and talk to at least one long-term resident or a local agent not connected to your transaction.
12. Understand Tax Obligations (With Real Numbers)
Thai property transaction costs are formula-based, not arbitrary. Budget for these on top of the purchase price:
| Cost | Typical rate | Who usually pays |
|---|---|---|
| Transfer fee | 2% of appraised value | Often split buyer/seller |
| Specific Business Tax (if seller owned under 5 years) | 3.3% of appraised or sale value, whichever is higher | Seller (often negotiated) |
| Stamp duty (if SBT does not apply) | 0.5% | Seller |
| Withholding tax | Progressive, based on seller type and ownership period | Seller |
| Annual land and building tax | 0.02% to 0.3% depending on use | Owner, ongoing |
These rates are set by Thai Revenue Department rules and can shift with government policy, so confirm current figures with a tax advisor before agreeing a price split with the seller.
Key action: Get a written cost breakdown from your lawyer before signing the sale agreement, not after, since transfer fee and tax splits are negotiated as part of the price.
13. Verify the Foreign Ownership Quota (Condominiums)
Foreigners can own condo units outright, but only up to 49% of the total saleable area in any single building under the Condominium Act. Buy into a building already at quota and you cannot register the unit in your own name, even after paying.
Key action: Request a current foreign quota certificate from the condominium's juristic person before signing anything. Do not accept a verbal assurance from the sales team.
14. Review Contracts With an Independent Lawyer
Sale and purchase agreements in Phuket are frequently drafted by the seller's or developer's own lawyer. Clauses on deposit forfeiture, delay penalties, and defect liability are where buyers lose leverage if they don't negotiate before signing.
Key action: Use a lawyer you engaged yourself, not one recommended by the seller or agent, and insist on a bilingual Thai/English contract with both versions carrying equal legal weight, confirmed explicitly in the text.
15. Vet the Developer (Off-Plan Purchases)
Off-plan risk in Thailand is real. Check these seven things before paying a reservation deposit:
- Company registration and financial filings with the Department of Business Development
- Construction license for the specific project
- Track record of prior completed projects, visited in person if possible
- Payment structure tied to verified construction milestones, not calendar dates
- Escrow or bank guarantee arrangements, where available
- Outstanding litigation or liens against the developer entity
- Independent reviews from past buyers, not just testimonials on the developer's own site
Key action: Ask for staged payments tied to independently verified construction progress, and have your lawyer confirm the developer entity signing the contract is the same one that holds the land title.
16. Understand Management and Maintenance Costs
Common area fees and sinking funds are often quoted at launch prices that don't reflect real operating costs a few years in.
Key action: Request three years of historical common area fee statements and sinking fund balances, not just the current year's budget, and check whether fee increases have kept pace with maintenance needs.
17. Plan Your Exit Strategy
Resale liquidity in Phuket varies a lot by area, unit type, and ownership structure. Leasehold villas and units above the foreign quota in older buildings typically take longer to sell than freehold condos in established areas.
Key action: Ask your agent for actual closed resale prices in the development over the past two to three years, not just current asking prices, and factor holding costs into your target hold period.
Due Diligence Cost and Timeline
A proper due diligence process, covering title search, lawyer review, and inspection, typically takes 2 to 4 weeks and costs roughly THB 30,000 to 80,000 depending on property complexity and whether a company structure is involved. This is a small fraction of a typical purchase price and the single best insurance you can buy against the issues above.
Red Flags That Should Stop a Purchase
- The seller or agent pressures you to skip an independent lawyer
- Nominee shareholders in a company structure, or anyone describing this as normal practice
- No registered access to a villa plot, or a verbal-only right of way
- Off-plan payments tied to dates rather than verified construction milestones
- A foreign quota certificate the juristic person is reluctant to provide in writing
- Title annotations you're told to "not worry about"
Conducting real due diligence isn't a formality here, it's what separates a secure investment from an expensive lesson. Work through this checklist with an independent lawyer before you sign anything, and don't let a good price talk you out of a step you'd otherwise insist on.
Read next: step-by-step buying guide for foreigners, foreign ownership legal guide, or browse current Phuket listings.
Frequently Asked Questions
How long does Phuket property due diligence take?
A thorough process typically takes 2 to 4 weeks, depending on property complexity, whether a company structure is involved, and how quickly the Land Office and relevant offices respond.
Can I do due diligence myself, or do I need professionals?
Some steps, like a neighborhood walk or checking listed resale prices, you can do yourself. Title searches, contract review, and company structure checks should go through a licensed Thai lawyer, since the legal exposure (particularly around nominee structures) is significant.
What are the most common issues found during due diligence in Phuket?
Unclear or downgraded title deeds, undisclosed encumbrances, unregistered access rights for villas, and nominee shareholder structures in company-owned property.
Is a Chanote title always required?
It's the strongest option and the one to aim for, but Nor Sor 3 Gor titles are also purchasable and can sometimes be upgraded. Weaker documents like Nor Sor 3 or Sor Kor 1 carry meaningfully higher risk and should be approached with caution.
What is a nominee shareholder structure and why does it matter?
It's an arrangement where Thai shareholders hold shares on paper without real capital or control, used to let a foreign buyer control land through a Thai company in violation of the Foreign Business Act. It's illegal, and if discovered, the Land Department can order the structure unwound or the land sold.
