Developer Due Diligence in Thailand: 7 Checks Before You Pay

Foreign buyers lose money in Thailand not because they chose the wrong location, but because they skipped the checks on the developer and the project. Developer due diligence in Thailand means verifying the company, the land, the permits, the financing, and the contract before you transfer a single baht. This guide gives you a step-by-step verification playbook for 2026, written for someone buying from abroad without local contacts.

The core rule is simple: a developer's credibility is measurable. You can check their completed projects, their land title class, their building permits, and their litigation history. What you cannot see clearly from abroad, a qualified Thai property lawyer can verify on the ground in days. Hire one before you sign anything.

Quick answer

• Check completed projects first. A developer with no delivered buildings is the single biggest red flag. Ask for addresses of completed projects, then verify on Google Street View and satellite imagery.
• Verify the land title class. Only a chanote (Nor Sor 4 Jor, the highest-class title deed in Thailand) gives you full ownership security. Anything lower carries legal risk.
• Confirm permits before paying. A building permit (or Condominium Act registration for condos) must exist before you sign a purchase agreement. 'Coming soon' renders without permits are a standard pre-sales risk.
• Ask how construction is financed. Bank construction finance means a lender is already monitoring the project. Buyer-instalment-only financing means your money is building the building.
• Tie every payment to a construction milestone. Your contract must link each tranche to a physical stage: foundation complete, structure complete, fit-out complete, transfer.
• Run a litigation search. A Thai lawyer can check the Civil Court database for active or historical cases against the developer company.
• Budget THB 30,000-80,000 (indicative, 2026 market rates) for a qualified property lawyer. This fee is the cheapest insurance you will buy in Thailand.

Options and scenarios

How do I check a Thai developer's completed project track record?

The direct answer: request a list of every completed project by name, location, and delivery year, then verify each one independently.

Here is the verification sequence:

1. Ask the sales team for a project list. Any reputable developer will provide it without hesitation. Refusal or vague answers are a red flag.
2. Cross-reference with public property databases. Thailand's Department of Lands records title transfers. Your lawyer can run a check to confirm that units in past projects were actually transferred to buyers.
3. Check satellite and street imagery. Google Maps satellite view will show you whether a building the developer claims to have finished actually exists and appears occupied.
4. Search Thai construction news archives. Industry publications track major project completions. A developer with no press record of completed buildings is unproven.
5. Look for juristic person registration. A juristic person (the homeowners' association entity that manages a condominium building under Thai law) is only created after a building is officially registered. If past projects have juristic persons registered, the buildings were legally completed.

What a track record check costs when ignored: buyers in stalled projects have waited 5-10 years for delivery and in some cases received no refund. Thai courts can award compensation, but enforcement against an insolvent developer is difficult and slow.

How do I verify the land title behind a Thai project?

The direct answer: your lawyer requests a title search at the local Land Department office. This cannot be fully substituted by documents the developer gives you.

Thai land titles exist in a hierarchy. Only the top two matter for a secure purchase:

• Chanote (Nor Sor 4 Jor): Full title deed, GPS-surveyed boundaries, highest security. This is what you want.
• Nor Sor 3 Gor: Confirmed rights, can be transacted but boundaries may be less precise. Acceptable with caution.
• Nor Sor 3: Possessory rights, not a full title deed. High risk for a purchase.
• Sor Kor 1 / Por Bor Tor 5: Occupancy or usage notifications, no ownership rights. Do not buy.

A Land Department title search (conducted by your lawyer at the provincial office) confirms the class, confirms the registered owner, and reveals any encumbrances (mortgages, liens, or servitude rights registered against the land). A developer with a construction loan will have their lender's mortgage registered on the chanote. This is normal. What is not normal is a lender's mortgage registered without any disclosed construction loan, or a title that belongs to a third party unrelated to the developer.

If the project is a condominium, also confirm that the Condominium Act registration (the legal step that creates individual unit title deeds, called chanote condo) has been applied for or granted. No registration means no individual titles can be issued to buyers.

How do I check building permits and EIA approval status?

The direct answer: building permits are issued by the local municipality or district office (Tessaban or Or Bor Tor), and EIA (Environmental Impact Assessment) approval for large projects is granted by the Office of Natural Resources and Environmental Policy and Planning. Your lawyer can verify both.

Key permit checks:

• Building permit (Bai Anuyat Kor Sang): Required before construction begins. If a developer is selling units off pre-rendered images without a building permit, you have zero legal protection if the project changes shape, loses permits, or stalls.
• EIA approval: Required for condominium or resort projects above certain size thresholds (typically buildings over 80 units or in protected coastal zones). An EIA-exempt project must still have a confirmed exemption. A project selling without resolved EIA is at risk of construction halt.
• Construction progress versus permit scope: Confirm that what is being built matches what the permit authorises. Unauthorised additions create transfer problems later.

Red-flag threshold: if you are asked to pay more than 10% of the purchase price before a building permit is confirmed in writing, reconsider. Some developers ask for a reservation fee before permits are issued - keep this below THB 100,000 and ensure it is fully refundable if permits are not granted within a defined period.

How is the project financed, and why does it matter?

The direct answer: projects financed by a reputable Thai commercial bank have a third-party lender monitoring construction quality and progress. Projects financed entirely from buyer instalments place all the risk on you.

Ask the developer directly: 'Is this project financed by a construction loan from a Thai bank?' Then ask your lawyer to verify by checking the land title for the bank's mortgage registration.

Two main financing structures exist:

Bank-financed construction: The developer borrowed from a commercial bank before selling to you. The bank has appraised the project, registered a mortgage on the land, and will monitor drawdowns against construction milestones. This does not guarantee completion, but it means a professional lender has already done its own version of due diligence. Banks typically require 30-40% of units to be pre-sold before releasing funds.

Buyer-instalment-only financing: The developer is building with money collected from early buyers. Your Stage 1 payment funds the foundation; Stage 2 payments fund the structure. If sales slow, construction slows or stops. This model is not automatically fraudulent - many legitimate Thai developers use it - but it requires you to be more rigorous about payment milestone schedules and the developer's sales velocity.

What this costs when ignored: buyers in instalment-financed projects that stalled mid-construction have reported losing 20-50% of the purchase price with no path to refund, because the developer company had no assets left to claim against.

What payment schedule should I insist on in my purchase agreement?

The direct answer: every payment tranche must be tied to a specific, verifiable construction milestone. Generic timelines ('payment due 12 months after signing') are not sufficient.

A secure milestone-based schedule looks like this (indicative structure for a condominium, 2026):

• Reservation deposit (1-3% of price): Paid to hold the unit, refundable if due diligence fails or permits are not issued.
• Contract signing (10-15%): Paid only after you have reviewed the full Thai-language purchase agreement with your lawyer.
• Foundation complete (10-15%): Verified by your lawyer or a site inspector.
• Structure complete (10-15%): Same verification.
• Walls and windows complete (10%): Same verification.
• Interior fit-out complete (10%): Same verification.
• Transfer and key handover (remaining balance): Paid at the Land Department on the day of transfer.

Any developer asking for 30-50% upfront before construction begins, with the remaining balance 'on completion', is either poorly capitalised or placing all financing risk on buyers. This is a red flag, not a standard.

Insist on a delay penalty clause: typically 0.01-0.1% of the purchase price per day of delay beyond the contractual completion date. Thai law does not automatically impose delay penalties unless your contract specifies them.

How do I check if a developer has litigation history in Thailand?

The direct answer: Thai civil court records are searchable through a lawyer. The Court of Justice website (www.coj.go.th) allows some case status searches, but a full litigation history check requires a qualified Thai lawyer to run searches by company name in the Civil Court and potentially the Land Department dispute records.

What to look for:

• Active lawsuits from previous buyers: Multiple cases claiming non-delivery or fraud indicate a pattern.
• Judgments against the company: Unpaid court judgments are a sign of financial distress.
• Bankruptcy proceedings: Thailand's Bankruptcy Act proceedings are searchable. A developer in bankruptcy cannot transfer clear title.
• Consumer Protection Board complaints: The Office of the Consumer Protection Board (OCPB) maintains records of formal complaints. Your lawyer can request relevant records.

Note: one or two historical disputes resolved in the developer's favour are not automatically disqualifying. A pattern of unresolved or buyer-adverse judgments is.

What can I verify online from abroad, and what requires a lawyer on the ground?

The direct answer: satellite imagery, company registration basics, and news archives are accessible remotely. Land title class, permit status, litigation history, and contract review all require a qualified Thai property lawyer physically in Thailand.

Verifiable online from abroad:

• Google Maps satellite view: confirms whether past projects are built and occupied
• Thailand Department of Business Development (DBD) company search (www.dbd.go.th): confirms company registration, registered capital, and filing history
• General news searches: identifies serious public disputes, project failures, or regulatory actions
• Developer's own marketing materials: cross-reference claims against permit documents they provide

Requires a lawyer on the ground:

• Land Department title search: confirms chanote class, registered owner, encumbrances
• Building permit verification: requires visiting the issuing municipality
• Litigation check: requires querying civil court databases by company name
• Contract review: Thai purchase agreements are in Thai; translation plus legal review is mandatory
• Site inspection: confirms construction milestone claimed for payment release

Expect to pay THB 30,000-80,000 (indicative, 2026 market rates) for a full legal due diligence package including title search, permit check, litigation search, and contract review. For a property costing THB 3-15 million, this is 0.5-2% of the purchase price and non-negotiable.

Comparison table

Check	Can you do it remotely?	Who does it on the ground?	Approximate cost (indicative 2026)	Risk if skipped
Company registration (DBD)	Yes, via dbd.go.th	n/a	Free	Low - basic check only
Completed project track record	Partly (satellite, news)	Lawyer + site visit	Included in legal package	Stalled or unproven developer
Land title (chanote) search	No	Thai property lawyer at Land Dept	THB 2,000-5,000 per title	No ownership security
Building permit verification	No	Lawyer at municipal office	Included in legal package	Project may be illegal or change design
EIA approval status	Partly (ONEP public records)	Lawyer confirms in writing	Included in legal package	Construction halt mid-project
Construction financing check	Partly (ask developer)	Lawyer verifies via title search	Included in legal package	100% buyer-funded risk
Litigation history check	No	Lawyer at Civil Court	Included in legal package	Buying from a legally troubled company
Contract review (Thai language)	No	Thai property lawyer	THB 10,000-25,000 standalone	Unfair terms, no delay penalty

Risks and mistakes

Mistake 1: Paying a large deposit before permits exist. Some developers collect 20-30% of the purchase price at the reservation or contract stage, before a building permit is issued. If the permit is refused or the design changes after approval, you have limited contractual grounds for a full refund unless your agreement explicitly covers this. Keep pre-permit payments below THB 100,000 and make refundability conditional on permit issuance.

Mistake 2: Accepting developer-provided documents as your only due diligence. A developer can show you a photocopy of a chanote or a permit. These documents can be outdated, altered, or selectively presented. Only a Land Department title search run by your own lawyer - not the developer's lawyer - gives you verified information.

Mistake 3: Skipping the construction financing question. If you do not ask how the project is financed, you will not know whether you are funding an already-capitalised project or whether your money is the capitalisation. The question is simple and legitimate. A developer who refuses to answer should be treated as a red flag.

Mistake 4: Signing a contract without a delay penalty clause. Thai developers do not always include delay penalties in standard contracts. Without a clause specifying compensation (commonly 0.01% per day of delay, or a right to cancel and receive a full refund after a defined delay period), you have weak legal recourse if the project is 12-24 months late. Late delivery of 12-24 months is not unusual in Thailand.

Mistake 5: Trusting renders and show units as evidence of a project's legal status. A polished show unit and a sales gallery do not prove that a building permit exists, that the land title is clean, or that construction financing is in place. Marketing investment is not correlated with legal compliance.

Mistake 6: Using the developer's recommended lawyer. This is a conflict of interest. A lawyer paid by or regularly referred by the developer cannot give you independent advice. Find your own lawyer through independent referrals or verified professional directories.

Mistake 7: Assuming a foreign-quota condominium unit is automatically protected. Foreign ownership of up to 49% of a condominium building's total floor area is permitted under the Condominium Act. But foreign-quota units are only transferable once the building has a valid Condominium Act registration and a condominium juristic person has been established. Buying in a project where this registration is pending or uncertain delays your ability to receive a clean title.

FAQ

What is the most important single check before paying a Thai developer?

The land title search. Confirm that the developer owns or controls a chanote (Nor Sor 4 Jor, the highest class of Thai land title) with no adverse encumbrances beyond a disclosed construction loan. Without this, nothing else matters.

How do I find a Thai property lawyer independently, without using the developer's referral?

Search the Thai Bar Association directory, ask your country's embassy in Bangkok for a referral list, or request recommendations from verified expat property owner communities. Avoid any lawyer suggested exclusively by the developer or their sales agent.

What is an FET slip and why do I need one as a foreign buyer?

An FET (Foreign Exchange Transaction) form is a document issued by a Thai bank confirming that foreign currency was converted into Thai baht and transferred into Thailand for the purpose of buying a condominium. Thai law requires this document for a foreigner to register a condominium unit in their name. Keep every FET document from every payment tranche.

Is a 30% upfront payment before construction starts normal in Thailand?

It is common, but it is not automatically safe. Some developers use large early payments to capitalise construction. If you pay 30% before construction begins and the project stalls, your capital is at risk. Where possible, negotiate milestone-based schedules. If a large early payment is unavoidable, ensure the contract includes cancellation rights with full refund triggers.

Can I verify a Thai company's registration and financial health online?

Yes, partially. The Department of Business Development website (dbd.go.th) allows free searches of registered Thai companies, showing registration status, registered capital, and annual filing history. A company that has not filed annual accounts in multiple years may be financially inactive. This check takes ten minutes and should always be your starting point.

What does 'foreign quota' mean for a Thai condominium?

Under the Condominium Act, foreigners may own up to 49% of the total floor area of a registered condominium building. The units within this 49% are called 'foreign quota' units and can be held in a foreigner's name on a full chanote title deed. Units above this 49% threshold cannot be directly owned by a foreigner. Confirm the foreign quota availability in your specific project before signing.

What is a sinking fund and when should I pay it?

A sinking fund is a one-time payment made at transfer, collected by the condominium juristic person to cover future major repairs such as elevator replacement or roof work. It is separate from monthly common area fees. Typical rates are THB 500-700 per square metre (indicative, 2026 market figures). It is not a developer fee; it is a building reserve fund. You should pay it only at transfer, not at contract signing.

What recourse do I have if a Thai developer fails to deliver my unit?

Your primary recourse is contractual: your purchase agreement should include a delay penalty clause and a cancellation clause with full refund rights after a defined delay (commonly 12-24 months beyond the stated completion date). Thai courts can enforce these clauses, but litigation is slow and expensive. This is why prevention through due diligence is more reliable than remedy after the fact.

Does a Thai developer need an EIA for every project?

No. EIA requirements apply to projects above specific size thresholds: typically residential or hotel buildings of 80 units or more in certain zones, or any project in a designated environmental protection area such as coastal zones in Phuket or Samui. Smaller projects may be exempt. Your lawyer should confirm the EIA status or exemption in writing for your specific project.

How long does a full legal due diligence check take in Thailand?

A thorough due diligence package, including title search, permit check, litigation search, and contract review, typically takes 7-14 working days once your lawyer has received the necessary documents and access. Some urgent searches can be completed faster. Build this timeline into your negotiation; do not sign under pressure to decide before due diligence is complete.

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