Due Diligence When Buying Property in Thailand

Due Diligence When Buying Property in Thailand: Step-by-Step Guide

Quick answer: Thailand property due diligence should confirm the title deed, seller authority, permits, foreign quota, building condition, developer record, juristic finances and SPA terms before money becomes non-refundable. The process usually takes 2 to 4 weeks and is cheap compared with the downside of a bad purchase.

Check	Why it matters
Chanote/title deed	Confirms legal ownership and boundaries
Foreign quota	Required for foreign freehold condo ownership
EIA/building permit	Confirms legal construction basis
SPA review	Catches one-sided payment and delay clauses

Due diligence when buying property in Thailand involves eight essential checks: title deed verification at the Land Department, EIA license confirmation, building permit review, foreign quota check, juristic person financial review, developer track record assessment, structural survey for resale, and SPA legal review by a Thai lawyer. The process typically takes 2 to 4 weeks and costs $500 to $2,000 in professional fees.

For the full cluster, start at Phuket Property Legal & Taxes Master Guide 2026.

Why Due Diligence Is Non-Negotiable in Thailand

Thailand’s property market has matured significantly since the 1990s, but the legal framework differs fundamentally from Western markets. There is no government-backed buyer protection scheme equivalent to the UK’s SDLT protections or Australia’s building warranties. Buyer protection comes from contractual due diligence, not systemic guarantees. The Thailand Board of Investment (BOI) actively promotes foreign property ownership as part of its investment attraction strategy, but the regulatory framework places verification responsibility squarely on the buyer.

Common problems that due diligence catches:

• Title deeds that are NS3 rather than Chanote (lower security, see our Chanote guide)
• Foreign quota already at or near 49% maximum
• Developer without valid building permit or EIA license
• Unresolved encumbrances or mortgages on the title
• Structural issues in resale units (moisture, cracking, roof problems)
• SPA clauses that heavily favour the seller at buyer’s expense

Every one of these problems has real financial consequences. Due diligence on a straightforward condominium purchase costs somewhere around $500 to $2,000 in professional fees. Skipping due diligence can cost $50,000-$500,000. The calculation is obvious.

Eight Essential Due Diligence Checks

How: Your Thai lawyer presents the original title deed to the local Land Department office and requests:

• Title type confirmation (Chanote = correct; NS3 = concern)
• Owner registration match (seller’s name must match)
• Encumbrance check (mortgages, liens, court injunctions)
• Boundary map review (for land/villa purchases)

What can go wrong:

• Title is NS3, not Chanote (weaker ownership right)
• Existing mortgage that must be cleared at transfer
• Title under litigation dispute
• Title in a different entity name than the seller

Timeline: 1-3 days Cost: Included in lawyer’s due diligence fee

Result you need: Written confirmation from lawyer that title is Chanote, seller is confirmed owner, no encumbrances recorded.

Check 2: EIA License Verification

What: For any significant development (most condo projects and villas with over 80 units or buildings taller than 23 metres), an Environmental Impact Assessment (EIA) approval is legally required before construction can begin under the National Environmental Quality Act B.E. 2535.

How: Request the EIA approval document from the developer. Your lawyer verifies its authenticity with the Office of Natural Resources and Environmental Policy and Planning (ONEP), which maintains a public database of approved EIA reports. For projects in Phuket specifically, the Phuket Provincial Office also tracks compliance with local building height restrictions (maximum 23 metres in most zones per Phuket Town Planning Regulations).

Why it matters: Construction without EIA approval is illegal. In rare cases, buildings have been demolished or faced legal action for lack of proper environmental approval. More commonly, missing EIA creates registration complications.

What to look for:

• EIA approval date (must pre-date construction commencement)
• Approval conditions (height limits, setbacks), verify the building complies
• Validity period

Red flag: Developer cannot produce the EIA document or becomes evasive about its existence.

Timeline: 3-7 days Cost: Included in lawyer’s fee

Check 3: Building Permit Review

What: Confirm that the building was constructed under a valid building permit (อนุญาตก่อสร้าง) and that construction conforms to the permit specifications.

How: Request the building permit from the developer or local municipality. Your lawyer reviews the permit conditions.

Key things to verify:

• Permit was issued before construction
• Permitted building specifications match actual building (height, floor area, number of units)
• No unauthorised additions or modifications

Common issue: Developers add extra floors or units beyond what the permit allows. These unauthorised additions create legal uncertainty for all units in the building.

Timeline: 3-7 days Cost: Included in lawyer’s fee

Check 4: Foreign Quota Confirmation

What: Confirm that sufficient foreign quota (maximum 49% of total floor space) remains available for your purchase.

How: Contact the condominium’s juristic person management directly, or have your lawyer request the current quota status in writing. The juristic person maintains records of all unit ownership, including nationality.

What to confirm:

• Total building floor space
• Currently foreign-owned floor space
• Remaining foreign quota in sqm and percentage
• That the specific unit you’re buying is not already in the foreign portion in a way that creates duplication

Red flag: Developer or seller is vague about quota status, or cannot provide written confirmation.

Timeline: 1-3 days Cost: Typically free from juristic person, minimal if lawyer coordinates

Important: Get this confirmation in writing before signing any binding agreement or paying deposits.

Check 5: Juristic Person Financial Review

What: Review the condominium building’s financial health, maintenance fee collection rates, outstanding debts, sinking fund reserves, pending major expenditures.

How: Request from the juristic person:

• Annual accounts (last 2-3 years)
• Current maintenance fee payment status
• Sinking fund balance
• Pending major maintenance or capital expenditure
• Any outstanding litigation involving the juristic person

Why it matters:

• Buildings with poor maintenance fee collection rates have deteriorating common areas
• Inadequate sinking funds mean future special assessments on all owners
• Pending litigation could affect the building’s finances and management

Timeline: 3-7 days (depends on juristic person responsiveness) Cost: Usually free from juristic person

Check 6: Developer Track Record

What: Research the developer’s history, completed projects, delivery record, quality of previous buildings, any legal disputes or complaints.

“For SET-listed developers like Origin Property, Sansiri, or Land & Houses, we cross-reference delivery claims against their quarterly filings to the Stock Exchange of Thailand. For unlisted developers, the Department of Business Development (DBD) company search at datawarehouse.dbd.go.th reveals registered capital, director changes, and financial statements.”, KPMG Thailand, Real Estate Due Diligence Best Practices, 2025

How:

• Request list of completed projects from developer
• Visit or view completed projects in Phuket
• Search online forums (ThaiVisa, FazWaz reviews, Trustpilot)
• Check Thai company registration status (DBD, Department of Business Development) at datawarehouse.dbd.go.th
• For SET-listed developers (Sansiri, Origin Property, Land & Houses, AP Thailand, Singha Estate), review quarterly filings on set.or.th
• Ask your agent for their assessment

Key questions:

• How many projects have they completed and delivered on schedule?
• Are previous buildings well-maintained?
• Are there owner complaints or legal disputes?
• Is the company financially sound (can check registered capital and accounts at DBD)?

Red flags:

• No completed projects (first development)
• History of significant delays
• Negative online reviews from previous buyers
• Company registered with low capital relative to project size

Timeline: 3-10 days Cost: Free to minimal

Check 7: Structural Survey (Resale Units Only)

What: A physical inspection of the unit by a qualified structural inspector or engineer to identify defects, moisture issues, plumbing problems, electrical compliance, and maintenance requirements.

How: Engage a qualified building inspector (your agent can recommend). They visit the unit and prepare a written report.

Common findings in Phuket resale units:

• Water infiltration around windows or roof (tropical climate accelerates this)
• Bathroom moisture and tile delamination
• Air conditioning unit age and condition
• Electrical panel compliance
• Balcony rail security
• Roof terrace waterproofing (for top floor units)

Cost: 5,000-15,000 THB for a full inspection report Timeline: 1-3 days for inspection, 3-5 days for written report

Decision impact: A structural survey finding significant defects gives you leverage to negotiate a price reduction or request rectification before transfer. Or to walk away if defects are severe.

Check 8: SPA Legal Review by Thai Lawyer

What: A qualified Thai lawyer reviews every clause of the Sale and Purchase Agreement before you sign.

How: Forward the draft SPA from the developer or seller to your Thai lawyer. Allow 5-10 working days for thorough review.

Key clauses to review:

• Completion date and what happens with delays
• Penalty clauses for non-completion by either party
• Tax allocation (who pays transfer tax, SBT, withholding tax)
• Representations and warranties from seller
• Force majeure provisions
• Common area completion provisions (for off-plan)
• Defect liability period (for new builds, typically 1-2 years)
• Dispute resolution mechanism

Red flags in SPAs:

• One-sided penalty clauses (buyer penalised heavily, seller lightly)
• No delivery date or vague delivery schedule
• Seller retains right to make material changes to specifications
• Dispute resolution in Thai only, Thai court jurisdiction with no alternative

Cost: 10,000-25,000 THB for SPA review (part of total legal fee) Timeline: 5-10 working days

Additional Checks for Off-Plan Purchases

Developer’s land title: Confirm the developer holds Chanote title for the project land. Cannot be stressed enough; if the developer doesn’t own the land outright or has a mortgage on it, your position as a buyer is compromised.

Construction financing: How is the developer financing construction? Reliable developers use a combination of buyer deposits and bank construction loans. If deposits are the only source of financing, construction risk is higher.

Escrow account: Does the developer hold buyer deposits in a separate escrow account, or in the general operating account? Separate escrow significantly reduces risk if the developer has financial difficulties.

Project registration status: Has the project been registered under the Condominium Act? Registration cannot happen until the building is substantially complete, but the developer should be able to show the application process has begun or is planned.

Due Diligence for Remote Buyers

Remote buyers follow the identical checklist, with all verification conducted by your Thai lawyer on your behalf and reported in English.

What to expect: Your lawyer provides:

• Written title deed verification report
• Foreign quota confirmation letter
• Developer background summary
• SPA legal review with recommended amendments
• Summary of all findings with recommendation (proceed / negotiate / withdraw)

Communication: Most English-speaking Thai lawyers offer WhatsApp and email updates throughout. Expect weekly progress reports and immediate contact for any significant findings.

Buyer scenarios: how much diligence each purchase needs

The eight checks above are the full set. How much weight each carries depends on what you are buying, and knowing that lets you scope the instruction rather than paying for a generic file.

A completed condominium bought freehold is the lightest case. The title and encumbrance position on the specific unit, the juristic person’s dated confirmation of remaining foreign allowance, the debt-free certificate, and the building’s own health: the CAM rate now and three years ago, the sinking fund balance, whether there has been a special assessment, and the minutes of the last two owners’ meetings. That last document is the most candid in any condominium transaction, because it records what owners actually disagreed about.

An off-plan purchase shifts the weight entirely onto the developer and the contract, because you will have paid substantial sums before anything exists to inspect. Thailand does not require escrow for residential off-plan sales, so the money already paid is protected by the contract and by the developer’s solvency and by nothing else. The checks that matter are the corporate position of the entity on the contract, the permits and the EIA approval where required, the completed-project record with advertised handover dates against actual ones, and the delay and default clauses read as clauses rather than as reassurance.

A villa is the heaviest case and the one where a cheap review is a false economy. Land cannot be held freehold by a foreigner, so what is being sold is a lease registered over the plot or a company holding it. The questions are who gives the renewal undertakings, whether a successor owner of the land would be bound, how much of the registered term remains, and, on a company structure, whether the Thai shareholding is genuine. Those failure modes are structural and they surface years later.

A remote purchase adds the mechanics rather than the substance: a power of attorney prepared properly and in advance, since not everything can be delegated and a document drafted the night before gets rejected, and a funds route agreed with the bank before the first large transfer.

What Happens if Due Diligence Finds Problems?

Moderate issues (SPA clauses unfavourable, older building condition): Request SPA amendments; renegotiate; factor repair costs into offer.

Major issues (title problems, foreign quota full, developer EIA missing): Walk away. Forfeit reservation deposit if applicable (typically $500-$2,000 at reservation stage). This is far cheaper than completing a problematic purchase.

The MOU deposit risk: Once you’ve signed an MOU and paid 5-10% deposit, withdrawing based on due diligence findings that were discoverable (i.e., a thorough buyer should have found) may not entitle you to full refund. Conduct as much due diligence as possible before MOU signing, or include specific conditions in the MOU allowing withdrawal without penalty if specific checks fail.

Frequently Asked Questions

Read Also:

• Proof of Funds and FET
• Best Areas to Buy in Phuket
• Foreign Quota in Thai Condominiums
• Phuket Property Market Outlook
• Freehold vs Leasehold in Thailand
• Buying Property in Phuket
• Documents to Check Before Buying

Frequently Asked Questions

What is the single most important check? +

Title verification at the Land Department, performed by your lawyer on the original rather than on a copy supplied by the seller. It reveals mortgages, encumbrances, court restrictions and registration irregularities, and it is where problems that would stop a transfer actually surface.

How do I confirm the foreign quota properly? +

A dated letter from the juristic person stating the remaining foreign-quota floor area in square metres, for your specific unit. Not a brochure line, not a verbal assurance, and not a letter from six months ago. If you are buying off-plan on a long build, also establish in the SPA what happens if the quota is exhausted before transfer.

What should due diligence cost and how long should it take? +

Independent legal review of a condominium purchase typically runs a low five-figure sum in baht, more for a villa structure. Allow two to three weeks. A reservation agreement with a refund condition tied to due diligence is what buys you that time, and it is the term most worth negotiating.

What do people most often skip? +

The juristic person's financial statements. The sinking fund balance against the building's age, the trend, and the owner delinquency rate together predict whether capital works arrive as scheduled maintenance or as a special assessment. It is a small piece of work and it surfaces a cost you would otherwise meet by surprise.

What is a red flag that should end the process? +

A seller who will not produce the title deed before the SPA, a reservation fee that is non-refundable regardless of what diligence uncovers, or a request to pay into an account that is not the party named in the contract. Each has a simple correct answer that a legitimate seller can give immediately.