Editorial
Developer Due Diligence in Thailand: 7 Checks Before You Pay
By THAI.ESTATE Editorial Team16 min read
Foreign buyers lose money in Thailand most often not because the law failed them, but because they skipped the verification steps before signing. Developer due diligence in Thailand means running a structured set of checks on both the company and the specific project before you transfer any funds. This guide gives you that checklist in the order you should use it.
The core principle is simple: a Thai developer's obligations to you are only as strong as the contract and their verifiable track record. Thailand has no buyer-protection escrow system for off-plan property. Your real protection is a payment schedule tied to construction milestones, contractual delay penalties, and hard evidence that the developer has delivered before.
Quick answer
- Check the developer's company registration at the Department of Business Development (DBD) online portal before anything else
- Confirm the land title is a full chanote (NS4 or NS4J) - any lower class of title reduces your legal standing significantly
- Verify EIA approval and building permit status directly with the local authority or through a licensed Thai lawyer
- Insist on a payment schedule tied to construction milestones - no payment before permit, no full payment before completion
- A developer with no completed projects in Thailand is a red flag regardless of marketing materials
- Court and litigation checks require a Thai lawyer; online resources cover company status only
- Budget THB 30,000 to THB 80,000 (indicative, 2026 market estimates) for a lawyer-led due diligence package - this is your cheapest insurance
Options and scenarios
How do I check a Thai developer's company registration and financial standing?
Start at the Department of Business Development portal (dbd.go.th). Every Thai company must register there. You can confirm the company's registered name, registration number, registered capital, directors' names, and whether the company is active or dissolved. This takes under ten minutes and costs nothing.
Registered capital matters. A developer with registered capital of THB 1 million selling units worth THB 200 million is a structural mismatch. There is no fixed legal minimum that guarantees safety, but registered capital below THB 5 million for a project of significant scale is worth querying. Ask the developer directly how the project is financed - bank project loan, buyer instalments, or equity. A legitimate developer will answer this clearly.
If construction financing comes entirely from buyer instalments with no bank credit line behind the project, you are taking on the role of the project's bank. That is a material risk. Demand documentary evidence of any bank construction loan - the name of the bank and the credit facility reference is enough to start.
How do I check a Thai developer's completed-project track record?
A developer's track record is the single most predictive indicator of delivery quality and timeline honesty. Ask for a list of completed projects with addresses, completion dates, and the name of the juristic person (the legal management body set up after completion for the building's ongoing administration). A juristic person exists only for completed, transferred buildings.
With a project address, you can physically visit or commission a local inspection. You can speak to existing owners. You can check whether the building is occupied. Marketing brochures for completed projects should match the delivered product - if they do not, that is informative.
Ask specifically about delays on past projects. In Thailand, a delay of six to twelve months on a three-year build is common. Delays beyond eighteen months without a documented force-majeure event are a red flag. A developer who cannot provide completion dates for past projects, or who deflects this question, is giving you an answer.
What is a chanote title and why does it control everything?
A chanote (officially NS4 or NS4J - Nor Sor 4 Jor) is the highest class of Thai land title. It is GPS-surveyed, registered at the Land Department, and represents full ownership rights. For a foreign buyer purchasing a condominium unit, the building must sit on chanote-class land for the unit to be legally transferable to you.
Lower title classes exist and create real problems:
- Nor Sor 3 Gor (NS3G): possessory title, upgradeable to chanote but not yet upgraded. Transferable but creates uncertainty during the upgrade process
- Nor Sor 3 (NS3): basic possessory document. No satellite survey. Higher risk of boundary disputes
- Sor Kor 1 (SK1): a notification of possession only. No transfer right. Completely unsuitable as a base for a development you plan to buy into
Ask the developer for the land title document number and the Land Department office where it is registered. A licensed Thai lawyer can request a title search (officially called a 'title search' or 'land title verification') at the relevant Land Department office for a small fee - typically THB 500 to THB 1,500 per title (indicative). This confirms ownership, any mortgage or encumbrance registered against the land, and the exact title class. Never skip this step.
How do I verify EIA approval and building permit status?
EIA stands for Environmental Impact Assessment. Any residential development in Thailand above a defined size threshold - generally condominiums with more than 80 units or exceeding 4,000 square metres of usable space in designated areas - requires an EIA approval from the Office of Natural Resources and Environmental Policy and Planning (ONEP) before construction can legally begin.
A building permit (or construction permit) is issued by the local authority: the municipality (Tessaban), the Provincial Administrative Organisation (PAO), or in some resort areas, a special authority. Without a valid building permit, construction is illegal and the building cannot be registered at the Land Department on completion.
Here is the risk when you ignore this: if you buy off-plan and pay instalments before a building permit is in place, and the permit is subsequently denied or modified (requiring design changes), your paid funds are committed to a project that may be substantially delayed or may never complete in the form sold.
The check: ask the developer for the EIA approval reference number and the building permit number. A legitimate developer will provide both without hesitation. Your lawyer can verify these directly with ONEP and the local authority. If a developer is 'in the process' of obtaining either document, that is not the same as having obtained them. Do not pay a meaningful deposit on a project without both documents in hand.
What is an aggressive payment schedule and why is it a red flag?
Payment schedules in Thai off-plan contracts vary widely. The structure of the schedule tells you how the developer finances construction and how much risk you carry.
A reasonable milestone-linked schedule for a three-year off-plan build (indicative structure):
- Reservation fee: THB 50,000 to THB 200,000 (fully refundable if contract is not signed)
- Contract signing: 10 to 15 percent
- Foundation complete: 10 to 15 percent
- Structure complete: 10 to 15 percent
- Shell complete: 10 to 15 percent
- On transfer/completion: 40 to 50 percent
An aggressive schedule looks like this: 30 to 50 percent on contract signing, with the balance due before construction reaches roof level. This means you are financing the developer's early construction with your capital before any significant physical asset exists. If the developer fails at this stage, recovery is difficult and slow.
Also watch for: non-refundable reservation fees above THB 200,000 before you have reviewed the contract with a lawyer, and penalty clauses that favour the developer asymmetrically (the developer can delay with small penalties but you forfeit large sums for late payment).
How do I check for litigation and legal problems?
Online resources in English do not cover Thai court records directly. Court and litigation checks require a Thai lawyer who can search the Central Intellectual Property and International Trade Court, the Civil Court, and relevant provincial courts by the developer's company registration number.
What to look for: active civil suits from previous buyers (alleging non-delivery, title defects, or contract fraud), judgments against the company, and any recorded bankruptcy or business rehabilitation proceedings. A company under business rehabilitation under the Bankruptcy Act is legally constrained and may not be able to complete new sales contracts normally.
Ask your lawyer to check both the development company and any parent or related companies named in the project documents. Developers sometimes create a new company for each project, leaving liabilities in old entities.
What can I realistically verify online versus what requires a lawyer?
This distinction is practical and important for buyers researching from abroad.
You can verify online (no lawyer needed):
- Company registration status, registered capital, and directors at DBD (dbd.go.th)
- Basic company financial filings (some are public via DBD)
- Developer's completed project addresses (then cross-reference via satellite maps or street-view tools)
- Whether the juristic person for claimed completed projects is registered (searchable via the Department of Local Administration)
- General news searches for the developer's name in Thai and English
You need a lawyer on the ground for:
- Land title class and encumbrance search at the Land Department
- Building permit and EIA approval verification with local authority
- Court and litigation record search
- Contract review and negotiation of milestone payments and delay penalties
- Confirmation that the developer's Foreign Business Certificate or condominium licence is valid
- Transfer readiness check before final payment
A solo online check is a filter, not a clearance. It tells you whether the developer passes the minimum bar for further investigation. It does not replace a lawyer's ground-level verification.
Comparison table
| Check | Can you do it remotely? | Cost (indicative 2026) | What you find | Risk if skipped |
|---|---|---|---|---|
| Company registration (DBD) | Yes, online | Free | Active status, capital, directors | Buying from a dissolved or shell company |
| Land title class and encumbrances | No - lawyer required | THB 500 to 1,500 per title | Chanote class, mortgages, disputes | Title defect blocks transfer at completion |
| EIA approval status | Partial (lawyer confirms) | Included in legal package | Legal right to build | Permit denied post-payment, project halted |
| Building permit | No - local authority only | Included in legal package | Legal construction underway | Illegal structure, no Land Department registration |
| Track record of completions | Partial (maps, visits) | Free to THB 5,000 for inspection | Delivery history, delay pattern | Choosing a first-time developer with no proof of delivery |
| Litigation and court records | No - lawyer required | Included in legal package | Active suits, judgments, bankruptcy | Buying from a developer already in dispute with past buyers |
| Contract review and payment schedule | No - lawyer required | THB 15,000 to 40,000 | Milestone links, delay penalties, exit rights | Asymmetric penalties, no milestone protection |
| Full legal due diligence package | No - combined service | THB 30,000 to 80,000 | All of the above | Full capital exposure on an unverified project |
Risks and mistakes
Paying a large reservation fee before contract review
Many developers ask for a reservation fee of THB 100,000 to THB 500,000 to 'hold your unit'. If this fee is non-refundable and you have not yet reviewed the contract with a lawyer, you have committed capital without knowing what you are buying. The standard practice is to pay a small, refundable holding deposit (THB 50,000 or less) and negotiate a window of five to ten business days to review the contract before committing further. A developer who refuses this is removing your ability to make an informed decision.
Accepting renders and promises in place of permits
Off-plan marketing in Thailand often begins before a building permit is obtained. Renders, showroom apartments, and sales offices are legal at this stage. But you should not pay more than a small, clearly refundable reservation fee until the building permit number is confirmed. The cost of the permit being denied or materially modified falls on you once you have signed a sales and purchase agreement and paid instalments.
Ignoring the land title check because the developer is well-known
Developer reputation is not a substitute for a title search. Even established developers sometimes build on land with complications: partial chanote, multiple co-owners, or a mortgage that must be discharged before transfer. The title search takes your lawyer a few hours and costs little. Skipping it because you trust the brand is a false economy.
Misreading delay penalty clauses
Thailand's Condominium Act provides some baseline protection, but the contract governs most of the detail. Weak contracts set delay penalties at 0.01 percent of the unit price per day, which on a THB 5 million unit is THB 500 per day - not a meaningful incentive for the developer. Negotiate for 0.1 percent per day and a right to cancel with full refund if delay exceeds twelve months. If the developer refuses both, document that refusal as a data point in your assessment.
Assuming a bank loan on the project means your money is safe
If the developer has a bank construction loan, it means the bank has performed its own project assessment and believes the developer can service the debt. That is a positive signal. It does not mean the bank protects your purchase instalments. The bank's security interest is in the land and the building, not in your individual payments. Your protection remains the milestone payment structure and your contractual rights.
Skipping a final transfer check
Before you pay the final transfer instalment, your lawyer should confirm: the building has received its completion certificate from the local authority, the land title is free of the developer's construction mortgage (or that the bank will discharge it simultaneously with transfer), and your name can be registered on the chanote or condominium title deed (Tor Dor 5 for a condominium unit). Buyers who skip this step have found themselves transferring the final 40 to 50 percent of the purchase price to a developer whose mortgage has not been discharged, leaving the unit encumbered.
FAQ
What is the first thing I should check when vetting a Thai developer?
Check the developer's company registration at the Department of Business Development portal (dbd.go.th). Confirm the company is active, note the registered capital, and verify the directors listed match the people you are dealing with. This takes under ten minutes and is free. It is the minimum filter before any further engagement.
Can I do developer due diligence in Thailand without hiring a lawyer?
You can do partial checks online - company registration, basic financial filings, and a surface review of completed projects. But the essential checks - land title class, building permit status, EIA approval, and court records - require a licensed Thai lawyer with access to the Land Department and local authority records. Skipping the lawyer saves THB 30,000 to THB 80,000 and risks losing millions.
What is a chanote title and why does it matter for my purchase?
A chanote (NS4 or NS4J) is Thailand's highest class of land title. It is GPS-surveyed, registered at the Land Department, and gives the holder full legal ownership rights. For a foreign buyer purchasing a condominium, the building must stand on chanote land for your unit title to be properly registered and transferable. Lower title classes create boundary disputes, upgrade delays, and in the worst case, make your unit untransferable.
What payment schedule should I accept for an off-plan condominium in Thailand?
Accept a schedule where no more than 15 percent is paid at contract signing and at least 40 to 50 percent is deferred to the transfer date. Each interim payment should be linked to a verifiable construction milestone - foundation, structure, shell, interior fit-out. A schedule requiring 30 to 50 percent at signing means you are financing the developer's early build with no physical asset to show for your money.
Does a Thai developer having a bank construction loan protect my deposit?
Not directly. A bank construction loan signals that a credentialed lender assessed the project positively. It does not give the bank any duty to protect your individual purchase instalments. Your real protection is a milestone-linked payment schedule, contractual delay penalties, and your lawyer's pre-transfer confirmation that the bank's mortgage will be discharged on completion.
How do I verify that an EIA approval is real?
Ask the developer for the EIA approval reference number and the issuing authority (ONEP). Your Thai lawyer can confirm with ONEP directly. You can also ask for a copy of the approval document - it is a public-record document that a developer has no reason to withhold. If the developer says EIA approval is 'in progress', do not pay more than a small, refundable reservation fee until it is confirmed.
What happens if the developer delivers late in Thailand?
Your rights depend entirely on your contract. The Condominium Act sets a baseline but penalty rates in contracts vary enormously. If your contract specifies a delay penalty of 0.01 percent per day, a six-month delay on a THB 5 million unit earns you approximately THB 90,000 - inadequate compensation for the real cost of delay. Before signing, your lawyer should negotiate a higher daily penalty (0.1 percent is a reasonable target) and a right to full contract cancellation and refund after twelve months of delay.
Can I check if a Thai developer has faced legal action from previous buyers?
Not through any free online English-language resource. Thai court records are not publicly searchable in the same way as some other jurisdictions. A Thai lawyer can search relevant courts by the developer's company registration number. This check takes one to three working days and is typically included in a standard due diligence package.
What is a juristic person in the context of Thai condominium buying?
A juristic person (niti bukhon in Thai) is the legally constituted management body of a completed condominium building. It is set up after the condominium registration is accepted by the Land Department and handles the building's common areas, maintenance, and finances. If a developer claims to have completed a project but no juristic person is registered, the building either has not completed the legal handover process or the claim is false. This is a straightforward check your lawyer can confirm.
How much should I budget for legal due diligence on a Thai property purchase?
As a practical benchmark, budget THB 30,000 to THB 80,000 for a full due diligence package from a licensed Thai law firm as of 2026 (indicative market estimates). This typically covers company and litigation checks, land title search, permit verification, and contract review. On a purchase of THB 3 million to THB 20 million, this is 0.4 to 2.7 percent of the purchase price - the most cost-effective risk reduction available to you.
Planning a property purchase in Thailand? Send us your requirements - the THAI.ESTATE team will reply with specific options and a safety checklist for your case.