Bangkok’s Empty Cities: 730,000 Units and What It Means for Property Thailand Buyers

Bangkok’s skyline keeps growing while its homes sit dark

Bangkok’s neon streets and rising towers give the impression of a city still in demand, but the numbers tell a different story for property Thailand buyers and investors. At the end of last year there were an estimated 1.64 million empty housing units across Thailand, with 730,000 of those in Bangkok. That surplus is equivalent to about THB 3.45 trillion (USD 109 billion) in idle capital — a scale of waste that forces anyone interested in real estate investment to pause and reassess.

In our analysis, this is not a short-term blip. The glut in Bangkok is concentrated in a specific product type: mid-market condominiums built during the boom years of the late 2010s, especially along new transit corridors on the city’s outskirts. These developments were aimed at investors and price-sensitive buyers, but demand has shifted since they were conceived. The mismatch between what was built and what people want now is the central problem.

How the oversupply emerged: policy, pandemic and market timing

The excess supply in Bangkok did not appear at random. Several concrete events and choices combined to push completions past the market’s capacity to absorb them.

• 2019 lending rules: In April 2019 the Bank of Thailand tightened loan-to-value rules, increasing down-payment requirements for second and third properties. That measure was intended to curb speculation, and it did. It also removed a major buyer segment — speculative investors — from the condominium market.
• Pandemic disruption: Within a year, Thailand’s borders shut. Foreign buyers were effectively excluded for two years, and projects planned for 2019–2020 that were delayed only completed in 2023–2024, increasing supply at a time of weak demand.
• Developers pushed on: With land paid for and financing in place, many developers proceeded with construction rather than halt projects, which kept the delivery pipeline active even after market conditions changed.
• High household debt: Household debt in Thailand rose to roughly 90% of GDP, limiting local buyers’ ability to take on new mortgages and reducing mortgage affordability.

Put together, these forces created a scenario where completions outpaced absorption for several years. Data from the Thai Real Estate Research and Valuation Centre shows the national count of empty units ended last year at 1.64 million, concentrated in Bangkok and other once-hot corridors.

Who loses and who stands to benefit

This oversupply creates winners and losers in the market. We need to be precise about both.

Losers

• Developers: Many firms face slower sales velocity, prolonged marketing campaigns and pressure on margins as they offer discounts or incentives.
• Small investors who bought off-plan: Those who relied on quick capital gains or rental income may face illiquidity and carrying costs.
• Local first-time buyers: Tight bank underwriting and high household debt make mortgages harder to obtain for younger buyers.

Possible beneficiaries

• Price-sensitive buyers: Oversupply gives negotiating power to buyers able to secure better prices, incentives or rental guarantees.
• Long-term investors who can wait out the cycle: If income growth resumes and credit conditions ease, buying into discounted stock could pay off over a longer horizon.

But the situation is complex. For foreign investors, another challenge has emerged: banking friction. Since September, several Thai banks have tightened account opening rules and in some cases frozen accounts as part of anti-financial-crime measures. Bangkok Bank, among others, now asks for long-term visas, proof of marriage to Thai nationals or property ownership to open new deposit accounts. Expatriate forums report accounts being locked without prior notice, undermining confidence. We see this as more than a transactional headache — it affects trust and the ease of doing cross-border property transactions.

Product mismatch: why the existing supply is unpopular

A recurring quote from local industry figures captures the problem: the existing condominiums are becoming outdated fast. Marciano Birjmohun, vice chairman of the Singapore-Thai Chamber of Commerce, puts it bluntly: "Whatever stock there is in the market, it’s getting outdated very quickly. It doesn’t match today’s consumer anymore." That is a market failure of product-market fit.

Key aspects of the mismatch:

• Amenities and unit design: Many mid-market units have older amenity packages and layouts that don’t meet the lifestyle and work-from-home needs of millennial buyers.
• Location vs. desirability: Projects sited along new transit lines on the urban fringe were built to capture future demand that has not matured as predicted.
• Target buyer shift: The investor base is getting younger, while developers built for an older investor profile and for foreign buyers who were shut out during the pandemic.

In short, the units are there, but the people who want them either cannot afford them, are not the right demographic, or were not in the market when the product launched.

The regional ripple: Phuket, Chiang Mai and potential contagion

Bangkok’s problem is not confined to the capital. Developers and analysts are watching other markets for similar signs.

Phuket

Phuket has been a magnet for domestic and international buyers since tourism reopened. Developers such as Sansiri plan to launch about 20 new projects in the province over the next three years, targeting THB 24 billion in sales by 2028. Colliers warns that around 10,000 new flats could enter the Phuket market this year alone, and unsold inventory was 4,982 units across 16 projects at the end of Q4 last year. The risk is clear: if supply growth outpaces demand again, the island could replicate Bangkok’s oversupply problem in a few years.

Chiang Mai

Chiang Mai is a different case. Developers report stronger sales to certain foreign buyers, notably ethnic Burmese and wealthy Chinese investors. Birjmohun says the city is "doing fantastically now" because of lifestyle appeal and affordability relative to Bangkok.