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Thailand's Climate Change Act: What It Means for Your Building Project

  • 16 hours ago
  • 4 min read

Thailand passed a milestone in December 2025. On 2 December, the Cabinet approved the principles of the country's first-ever Climate Change Act, a comprehensive legal framework covering carbon pricing, mandatory greenhouse gas reporting, an Emissions Trading System, and a national climate fund.


For the building sector, this is not background policy. It is a direct signal that low-carbon, high-performance buildings are shifting from competitive advantage to legal expectation.


Here is what developers, owners, and project teams in Bangkok need to understand.


What the Act Contains

The draft law spans 205 sections across 14 chapters. It establishes four national governance bodies, including a National Climate Change Policy Committee responsible for setting Thailand's climate targets and international positions, and a Greenhouse Gas Management Organisation to oversee carbon markets and emissions registries.


The Act introduces four carbon pricing instruments: a carbon tax, an Emissions Trading System (ETS), a Cross-Border Carbon Adjustment Mechanism (CBAM) modelled on the EU framework, and a regulated domestic carbon credit market. Carbon credits are now legally recognised as tradable assets that can be bought, sold, transferred, and used to offset emissions under a national registry.


Mandatory greenhouse gas reporting applies to both public and private sector entities. The law is expected to require approximately 3,000 to 4,000 organisations to report Scope 1 and Scope 2 emissions, with around 300 entities subject to the ETS cap-and-trade system. Penalties for false reporting range from 30,000 to 300,000 baht, plus daily fines. Failure to submit emissions reports carries fines of up to 100,000 baht.


Full enforcement is anticipated in 2027, following parliamentary review and the drafting of up to 50 subsidiary regulations by the Department of Climate Change and Environment (DCCE).


Why Buildings Are Directly in Scope

Buildings account for a significant share of Thailand's energy consumption and greenhouse gas emissions through operations, cooling systems, materials, and construction activities. The Climate Change Act creates the first legal framework that links building performance directly to national carbon reduction targets.


For developers and asset managers, three implications stand out.


First, energy use and carbon emissions from buildings will need to be quantified and reported. This significantly strengthens the case for energy modelling, operational monitoring, and whole-life carbon tracking across portfolios. Buildings without measurement systems will face increasing scrutiny as the national greenhouse gas registry takes shape.


Second, the Act introduces the foundation for a national sustainability taxonomy, classifying economic activities as green, transitional, or red. This will directly shape access to green finance instruments. Buildings aligned with recognised certification standards such as LEED, WELL, EDGE, and TREES are expected to be better positioned for green financing, while poor-performing assets face growing risk from banks and investors.


Third, the Act requires national, provincial, and local adaptation planning for climate risks including floods, droughts, and extreme heat events. For Bangkok, a city exposed to urban heat island effects and seasonal flooding, climate resilience is becoming a compliance issue rather than a design preference.


What This Means for Project Teams

Carbon tax rates, ETS allocation rules, CBAM implementation details, and Climate Fund mechanisms are still to be defined in secondary legislation. However, the regulatory direction is now fixed.

Project teams that wait for final rules before acting will find themselves behind. The following steps are worth taking now.


STEP 1: Establish a baseline of your building's energy consumption and carbon emissions. Even a simple operational carbon calculation gives you a starting point for reporting obligations and positions you ahead of the mandatory MRV system.


STEP 2: Review your certification strategy. Buildings pursuing LEED, WELL, EDGE, or TREES certification are already tracking the data the new law will require. If your project is in early design, incorporating this from the start is far less costly than retrofitting reporting systems later.


STEP 3: Consider the commercial upside. Thailand's carbon credit framework opens new financial pathways for buildings that reduce emissions. On-site renewable energy, high-performance envelopes, and efficient HVAC systems may qualify buildings to generate and sell carbon credits within the regulated national framework.



Thailand's Broader Climate Targets

Thailand has committed to carbon neutrality by 2050 and net-zero greenhouse gas emissions by 2065. Under NDC 3.0, submitted in 2025, the country targets a 47% reduction in net greenhouse gas emissions compared to 2019 levels by 2035. The built environment is one of the largest levers available to meet these targets.


Thailand took its first concrete step toward structured carbon pricing in March 2025, restructuring excise taxes on petroleum products to reflect carbon content at a rate of THB 200 per tonne of CO2 equivalent. This is an interim measure ahead of the full carbon tax framework under the Climate Change Act. The


World Bank has recommended a carbon price of USD 25 per tonne to put Thailand on track for its Net Zero 2050 target by 2030, the current interim rate of THB 200 (approximately USD 5.50) sits well below that level and is expected to rise as the regulatory framework matures.


The Climate Change Act does not change what good buildings look like. It changes the financial and legal consequences of building poorly.



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