Editorial
Bangkok Resale Condo Due Diligence: 7 Checks Before You Sign
By THAI.ESTATE Editorial Team14 min read
Foreign buyers in Bangkok's resale condo market face a specific set of risks that new-build purchases do not carry. The seller has already lived in or rented the unit. The building has an operational history. The foreign ownership quota may be full. Any one of these factors can make a purchase legally problematic or financially damaging.
Per Siam Legal International, July 2026, average resale times in Greater Bangkok now exceed two years. That slow absorption means some listings carry asking prices that no longer reflect actual market value. Independent price verification is not optional - it is a basic buyer protection.
This checklist covers the seven checks that protect your money and your legal position before you sign any reservation agreement or pay any deposit.
Quick answer
- Average resale time in Greater Bangkok exceeds two years as of mid-2026, per Siam Legal International, July 2026 - extended listing periods increase the risk of stale pricing
- Foreign freehold quota: the Thai Condominium Act limits foreign ownership to 49% of the total unit area in any one building; this is calculated per building, not per development phase, and the available quota must be confirmed before you sign
- Four non-negotiable legal checks: title deed class and encumbrances, building compliance certificate, per-building quota status, and independent price benchmarking
- Listings can be outdated and unrepresentative of true market value; always cross-reference recent comparable sales in the same building before making any offer
- A reservation deposit (typically THB 50,000 to 200,000 by market estimate) is often non-refundable once paid; verify all four checks before paying any deposit
- Independent legal advice costs roughly THB 15,000 to 50,000 for a standard condo transaction review - far less than the cost of any one of the mistakes below
- All transfer fees and taxes are negotiable between buyer and seller; confirm in writing who pays what before signing
Options and scenarios
Scenario 1: You are buying a resale unit in a mid-market building in Sukhumvit
This is the most common situation for foreign buyers. The building was completed five to fifteen years ago. The seller may be an expatriate leaving Thailand, an investor cutting losses, or an estate liquidating assets. The unit is listed at a price the seller set twelve to twenty-four months ago.
In this scenario, the key risks are: the foreign quota may already be at or near 49%; the building's common-area fund (the sinking fund, a one-time payment to cover major future repairs, held by the juristic person - the building's management entity) may be underfunded; and the listed price may be 10 to 20 percent above recent actual transaction prices in the same building.
What you must do: request the juristic person's latest financial statements, run a title search at the Bangkok Land Office, confirm quota availability in writing from the juristic person, and obtain at least three comparable closed sales from the same building within the past six months.
Scenario 2: You are buying from a developer's resale inventory (unsold stock)
Developers sometimes sell units that were completed years earlier but never transferred to individual buyers. These appear as 'resale' but the developer remains the seller. Per Siam Legal International, July 2026, some listings in the Greater Bangkok market misrepresent the age and absorption status of inventory.
Here the title deed (chanote - the highest class of Thai land title, conferring full ownership rights and the only deed class suitable for condo unit purchase) should be in the developer's name, not a third-party investor. Confirm the building's occupancy certificate (the official document issued by the local authority confirming the building was constructed in compliance with approved plans) is in place. Check whether the condominium registration - a separate step under the Condominium Act that legally creates the individual unit titles - has been completed for every floor.
Scenario 3: You are buying in a building that has reached or is near the 49% foreign quota
This is a situation that many buyers discover only after paying a deposit. A building near Asok or Phrom Phong that was popular with foreign investors five to ten years ago may have a foreign ownership ratio at or above 49%. If that is the case, you cannot take freehold title as a foreign national. Your only legal alternatives would be a Thai-name purchase (which carries its own serious risks detailed in the Risks section below) or a long-term registered lease.
The prevention rule is simple: before any payment, request a written quota certificate from the juristic person, showing the current ratio of foreign-owned to Thai-owned unit area. Juristic persons are legally required to issue this document.
Comparison table
| Check | What you verify | Where to verify | Cost estimate | Consequence if skipped |
|---|---|---|---|---|
| Title deed (chanote) search | Deed class, ownership chain, mortgages, encumbrances | Bangkok Land Office (in person or via licensed lawyer) | THB 3,000 to 10,000 via lawyer | Buying a unit with an undisclosed mortgage or inferior deed class |
| Building compliance certificate | Occupancy permit, condominium registration, approved plans match actual structure | District office, Department of Public Works records | Included in standard legal review | Unit may be legally untransferable or subject to demolition order |
| Foreign quota status | Current foreign-owned percentage of total unit area in the building | Written certificate from juristic person | Free from juristic person; lawyer time to interpret | Paying a deposit on a unit you cannot legally own as a foreigner |
| Independent price benchmarking | Recent closed sales in same building, same floor band, same size | Land Office transfer records, licensed appraiser | THB 5,000 to 20,000 for appraisal | Overpaying by 10 to 25 percent on a unit that will be hard to resell |
| FET document (Foreign Exchange Transaction form) | Bank transfer records showing funds remitted from abroad in foreign currency | Your Thai bank, transaction records | No cost; requires planning | Losing the right to repatriate sale proceeds when you sell |
| Juristic person financials | Sinking fund balance, monthly common fee arrears on the unit, litigation history | Juristic person office | Free; request formally in writing | Inheriting the previous owner's unpaid fees or a building with no repair reserve |
| Sales contract legal review | Payment schedule, handover conditions, defect liability, transfer fee allocation | Independent lawyer | THB 15,000 to 50,000 | Signing away rights to price adjustments, inspections, or legal remedies |
Risks and mistakes
Is a Thai company a safe way to buy a villa or house instead of a condo?
No. Using a Thai-registered company with Thai nominee shareholders to hold residential land on behalf of a foreign buyer is a form of nominee ownership that Thai law prohibits. The Land Code and the Foreign Business Act both treat this as an attempt to circumvent foreign ownership restrictions. As of 2026, enforcement risk is real: authorities can investigate company shareholding structures, and a company found to hold land via nominees can have that land seized. The foreign buyer loses the property and all funds invested.
For residential property, foreign nationals have two legal paths: freehold condo ownership (within the 49% quota) or a registered long-term lease of up to 30 years on a house or villa. A registered lease is recorded at the Land Office on the title deed itself. An unregistered lease or a verbal promise of lease renewal is not enforceable against a new landowner if the property is sold.
What does stale listing pricing actually cost you?
Per Siam Legal International, July 2026, Bangkok resale listings can sit on the market for over two years. A seller who listed at peak pricing in 2024 may not have adjusted the asking price despite zero offers. Land Office transfer records, which are public, show actual transaction prices. If recent comparable sales in the same building are 15 percent below the asking price, that gap represents real money: on a THB 5 million unit, that is THB 750,000 in overpayment.
An independent appraisal by a licensed valuer (cost: THB 5,000 to 20,000 by market estimate) gives you a documented justification to negotiate. It also protects you if you are financing the purchase and a bank appraisal comes in below the agreed price.
What happens if you wire money with the wrong transfer description?
The Foreign Exchange Transaction (FET) form - also called a Thor Tor 3 in Thai banking practice - is the document your Thai bank issues when you receive an international wire transfer. It records that the funds arrived from abroad in foreign currency and were converted to Thai baht. Thai law requires this document as proof that the purchase funds were remitted from outside Thailand.
Without a valid FET form, you cannot legally repatriate your sale proceeds when you eventually sell the unit. The mistake that buyers make is wiring funds with a vague transfer description (such as 'personal transfer' or 'living expenses') rather than clearly stating the purpose as property purchase. Once the bank has processed the transfer under a non-property description, correcting the FET record is difficult and sometimes impossible. Instruct your foreign bank to include the property address or purchase purpose in the transfer details before sending any funds.
What if the seller promises features or finishes that are not in the contract?
Verbal promises made by sellers, agents, or developers carry no legal weight in Thai property law. If the seller tells you the unit includes built-in air conditioners, a specific furniture set, or a parking space, and that commitment is not written into the sale and purchase agreement, you have no legal recourse if those items are missing at handover.
The prevention rule: attach a detailed inventory list to the contract, signed by both parties, listing every fixture, fitting, and inclusion. Inspect the unit on the handover date before signing any completion document, and record the condition with photographs dated and timestamped.
What if the building's common area is in poor condition?
A building's sinking fund balance tells you how prepared the juristic person is for major repairs: roof replacement, elevator overhaul, facade repointing. A low or depleted sinking fund means a special levy is likely in the coming years. Ask the juristic person for the last two years of audited financial statements and the minutes of the annual general meetings. Look for mentions of pending litigation (a building in a legal dispute over construction defects, for example, may have frozen common-area spending).
Also check whether the previous owner has unpaid common-area fees (monthly maintenance charges). Under Thai law, unpaid fees can attach to the unit, meaning you as the new owner may inherit the debt. Require written confirmation from the juristic person that all fees are current before the transfer date.
FAQ
How do I confirm the foreign ownership quota before paying a deposit?
Contact the juristic person of the building directly and request a written quota certificate. This document states the current ratio of foreign-owned unit area to total unit area. If the ratio is at or near 49%, you cannot take foreign freehold title. The juristic person is the legal management body of the condo building and is required under the Condominium Act to provide this information. Do not accept a verbal assurance from an agent. Get it in writing before any payment.
What title deed class should a Bangkok condo unit have?
The unit should have a chanote (full title deed, NS-4J in Thai). This is the highest class of Thai land title and the only class suitable for condo unit ownership. Lower-grade documents (such as Nor Sor 3 Gor or Nor Sor 3) indicate that the land survey is incomplete or the rights are provisional. For a registered condo unit, the individual unit title (the condominium title deed) is derived from the chanote of the land below the building. Your lawyer verifies this at the Land Office.
How do I check the building's compliance and occupancy certificate?
Ask your lawyer to search the records at the relevant district office (Khet in Bangkok) and the Department of Public Works and Town and Country Planning. The building should have an occupancy permit confirming construction matched the approved plans. The condominium should also be registered under the Condominium Act, which creates the individual unit titles. If the condominium registration is incomplete for certain floors or phases, those unit titles may not legally exist yet.
Why do resale prices in the same building vary so much?
Per Siam Legal International, July 2026, some listings in the Bangkok resale market are outdated and do not reflect actual transaction prices. Sellers who listed two or more years ago may not have reduced asking prices despite a slow market. Floor level, view direction, renovation quality, and furniture can all justify price differences within the same building. However, the most reliable benchmark is the Land Office transfer record for comparable units - same floor band, similar area - sold within the past six months. These records show what buyers actually paid, not what sellers asked.
What is an FET form and why does it matter for resale?
The FET (Foreign Exchange Transaction) form, sometimes called a Thor Tor 3, is issued by your Thai bank when you receive an international transfer in foreign currency that is converted to Thai baht. It is the documentary proof that your purchase funds came from abroad. Under Thai banking regulations, this document is required to repatriate the proceeds when you later sell the unit. If you fund your purchase from a Thai bank account that already holds baht (without an FET-linked transfer), you may not be able to move the sale proceeds out of Thailand.
Can I rely on a 30-year lease as an alternative to freehold ownership?
A registered 30-year lease on a house or villa is a legal and enforceable right under Thai law, but only if the lease is registered at the Land Office and noted on the title deed. An unregistered lease or a verbal promise of renewal for a further 30 years has no legal standing against a new landowner if the property changes hands. The practical limitation of a registered lease is that Thai courts have generally not enforced pre-agreed lease renewals beyond the initial registered term. You should understand that a 30-year lease is a 30-year right, not a 90-year right with renewal options.
How long does a full due diligence process take in Bangkok?
A thorough due diligence for a Bangkok resale condo typically takes two to four weeks if the seller cooperates and the Land Office records are accessible. The title search takes three to five business days. The juristic person may take five to ten business days to provide financial statements and a quota certificate. Legal review of the sale and purchase agreement adds three to five business days. Build this timeline into your reservation agreement so that your deposit is refundable if due diligence reveals a problem.
What should the sale and purchase agreement include beyond the price?
At minimum: the full legal description of the unit from the chanote, a complete inventory of inclusions, the payment schedule with exact dates and amounts, the transfer date, who pays which transfer fees and taxes, the defect liability period and procedure, and a clause making the agreement conditional on satisfactory due diligence results. Any verbal promise by the seller that is not in the written agreement is unenforceable.
Are transfer fees negotiable, and what is the standard split?
Transfer fees and taxes in Thailand include a 2% transfer fee on the assessed Land Office value, a 0.5% stamp duty or a 3.3% specific business tax (SBT applies if the seller has owned the unit for fewer than five years), and a withholding tax calculated on the assessed value and the seller's ownership period. By market practice, the transfer fee is often split 50/50 between buyer and seller, but this is negotiable. All fee allocations must be recorded in the sale and purchase agreement. Never agree to a fee split verbally.
What is a sinking fund and should I pay it again on a resale purchase?
A sinking fund is a one-time capital contribution paid at the time of first purchase to fund major future repairs to the building's common areas (lifts, roof, structure). On a new-build purchase, the developer collects it. On a resale purchase, the sinking fund was already paid by the original buyer and remains with the building - you do not normally pay it again. However, if the building's sinking fund has been partially depleted and the juristic person has passed a resolution to top it up, you may be asked to contribute. Check the juristic person's meeting minutes to see if any special levy has been voted on.
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.