Earthquake-Resistant Buildings in Japan: Engineering, Investment, and Financial Benefits

Japan is one of the world's most seismically active regions, recording approximately 1,500 noticeable seismic events per year and over 150 earthquakes of magnitude 5 or higher annually, according to Japan Meteorological Agency data.

Two natural disasters in particular shaped Japan's approach to earthquake-resistant building design: the Great Kanto Earthquake of 1923, a magnitude 7.9 event that killed an estimated 140,000 people and devastated Tokyo and Yokohama, and the Kobe Earthquake of 1995, a magnitude 6.8 event that killed approximately 6,400 people.

In response, the Japanese government has developed some of the world's strictest earthquake resistance standards and building regulations, governed by the Building Standards Act.

This article will explain the following points.

• Construction technology for high-rise buildings and residential homes

• Benefits of investing in earthquake-resistant real estate in Japan

• Earthquake resistance standards and building regulations in Japan

What is an earthquake-resistant building in Japan?

Earthquake-proof buildings in Japan are designed to absorb and minimize seismic energy and withstand earthquakes by using different technologies.

How do Japanese earthquake-resistant buildings work?

Earthquake-resistant buildings in Japan are designed with high-level engineering, and they are supported by the government’s strict building regulations to withstand earthquakes.

Japan’s engineering & modern building technologies

Japan’s earthquake resistance technology consists of three main technologies: seismic isolation (免震, menshin), earthquake-resistant structures (耐震, taishin), and seismic dampers (制振, seishin). 

1. Seismic isolation (免震, menshin) 

Menshin refer to seismic isolation bearings (rubber layers) absorb seismic motions. 

The bearings are installed between the building and the ground to prevent earthquake shaking from being transmitted to the building itself. 

These bearings can cut shaking by 70%-80%, reducing furniture falling over and secondary damage. However, the construction costs tend to be high.

2. Earthquake-resistant structures (耐震, taishin)

Taishin are steel-reinforced concrete structures designed to resist collapse. 

The new earthquake resistance standards, introduced on June 1, 1981 through a revision of the Building Standards Act, introduced a two-phase design requirement.

• Buildings must sustain only minimal damage (minor cracking) in a medium-scale earthquake of JMA seismic intensity scale 5 or higher.

• Buildings must not collapse or break down in a large-scale earthquake of JMA seismic intensity scale 6 to 7.

This dual-phase approach was a significant upgrade from the old standard, which only required that buildings not collapse in an intensity 5 earthquake with no provision for stronger events.

3. Seismic dampers (制振, seishin)

Seishin dampers refer to devices that reduce seismic intensity by dissipating seismic forces. Dampers and weights are used to minimize the seismic motion and the shaking of buildings.

Flexible structures are used in skyscrapers, incorporating central pillars and modern engineering techniques to prevent structural failure.

Overview of Japan’s strict building regulations

Earthquake-proof building structures are strictly regulated by building codes and regulations. The following are the standards that most Japanese homes fall under. 

1. Old earthquake resistance standards (building before 1981)

Buildings were designed to withstand earthquakes when subjected to shaking with a seismic intensity of 5 or higher.

2. New earthquake resistance standards (building after 1981, Revised in 2000 & 2013)

This new standard required buildings to withstand earthquakes of JMA Seismic Intensity Scale 6-7.

The 2000 revision, introduced following the 1995 Great Hanshin Earthquake, added more stringent requirements for wooden residential buildings. Wooden houses with a construction confirmation certificate issued on or after June 1, 2000 must use continuous concrete strip foundations and meet updated specifications for wall placement and metal joint connections. Buildings meeting the 2000 standard are considered to offer superior seismic resistance compared to those built under the 1981 standard alone.

3. Housing performance labeling system (耐震等級, Taishin Tōkyū)

The labeling system offers earthquake safety ratings for Japanese buildings. 

The system divides buildings into different levels based on their ability to withstand seismic forces. 

There are typically three levels: Grade 1 (Standard), Grade 2 (Higher resistance), and Grade 3 (Highest resistance), with Grade 3 buildings designed to withstand strong earthquakes without significant damage.

• Grade 1 (standard): A structure that will not collapse or break down even when subjected to the force of an earthquake that occurs extremely rarely (about once every few hundred years).

• Grade 2 (higher resistance): It will not collapse or break down even if it is subjected to an earthquake force 1.25 times that of earthquake resistance grade 1.

• Grade 3 (highest resistance): It will not collapse or break down in an earthquake 1.5 times stronger than the seismic force of seismic resistance grade 1.

Understanding seismic risk by location in Japan

Earthquake risk in Japan varies significantly by region. The Japanese government publishes seismic hazard maps through the National Research Institute for Earth Science and Disaster Resilience (NIED), which estimate the probability of strong ground motion at any location over a 30-year or 50-year period. Key factors that affect building seismic risk include:

• Building foundation conditions: Buildings on soft alluvial soil (including natural levee zones near rivers) experience stronger shaking than buildings on firm rock. Soil liquefaction is a significant risk in coastal and riverside areas.

• Building age: Buildings constructed before June 1, 1981 under the old earthquake resistance standards are significantly more vulnerable in major earthquakes. Evidence from the 1995 Great Hanshin Earthquake showed that buildings built to the 1981 standard survived in much greater numbers than those built under older codes.

• Building type: Reinforced concrete structures and steel-reinforced concrete frames generally outperform older unreinforced masonry or pre-1981 wooden structures in strong earthquakes.

Before purchasing a property in Japan, buyers should check the municipality's published seismic hazard map and confirm the building's construction date relative to the 1981 and 2000 revision milestones.

Why is the earthquake-resistant standard important to know about when investing in property in Japan?

When purchasing a property in Japan, the buyer must confirm if the building meets seismic standards through documents and inspection for the following reasons.

1. Property safety & structural integrity: Buildings that meet new earthquake resistance standards are designed to withstand stronger earthquakes and can reduce the risk of collapse and repairs.

2. Legal compliance & certification: Buildings must meet specific regulations and buyers must confirm inspection reports, building certificates, and real estate disclosures to confirm compliance. Otherwise, the buyer may face legal and safety risks.

3. Property value & marketability: Earthquake-resistant buildings have higher resale value and rental demand.

4. Insurance & financial protection: Buildings with higher seismic resistance might qualify for lower earthquake insurance premiums. 

👉Learn more about property investment in Japan: Real Estate Investment in Japan: Benefits, Risks, Considerations

How can I find out a property’s earthquake resistance level?

When purchasing a property in Japan, the buyer must verify the following documents to check the property’s earthquake resistance level.

• Inspection reports: Building’s seismic resistance and retrofitting details by certified engineers.

• Certificate of inspection (建築確認証明書, Kenchiku Kakunin Shoumeisho): It confirms if the building design meets seismic standards or not. 

• Earthquake resistance standards compliance certificate (耐震基準適合証明書, Taishin Kijyun Tekigou Shoumeisho): It certifies whether or not the building complies with the new earthquake resistance standards.

• Real estate disclosure: Sellers must disclose any known structural issues or earthquake damage.

The buyers should request proof of the latest inspection report to avoid any kind of risk.

Financial benefits of earthquake-resistant buildings in Japan

Investing in earthquake-resistant buildings in Japan can benefit property owners financially in many ways. 

The main benefits are tax incentives, government subsidies, and insurance premiums. 

The benefits depend on whether you are buying a new home or are buying a used home. The following is a breakdown of the financial benefits of both options: 

Financial benefits when building a new property 

1. Tax incentives 

• Mortgage tax reduction: In Japan, if you acquire a new home using a mortgage, there is a system that allows you to deduct 0.7% of the loan balance at the end of the year from your income tax for up to 13 years. However, for new homes that undergo building confirmation after 2024, it is important to note that you will not be able to receive the mortgage deduction unless the home is of high quality and meets the energy-saving standards. 👉Note: When foreigners take out a home loan, the loan conditions may differ depending on whether they have permanent residency or employment status.

• Tax reduction for long-term quality homes: If the house is certified as a long-term quality home, you will be eligible for tax benefits such as registration & license tax, real estate acquisition tax, and fixed asset tax.

2. Government subsidies 

• Local subsidies: Some municipalities offer subsidies and grants for the construction of new homes with high energy-saving and earthquake-resistant performance. You will need to check the specific details at the office of each municipality.

3. Insurance benefits

• Lower insurance premiums: Earthquake-resistant homes may qualify for discounts on earthquake insurance premiums. Discounts of 10%-50% are applied to standard premiums, depending on the age of construction or earthquake-resistant performance.

Financial benefits when buying a used property

1. Tax reduction measures

• Mortgage tax reduction: If the used home meets strict criteria, 0.7% of the remaining loan balance from their income tax applies for up to 10 years.

• Income tax deduction for seismic retrofitting: If seismic retrofitting is carried out, there is a system that allows a 10% deduction from the construction cost (up to 250,000 JPY) from your income tax for up to 1 year.

• Fixed property tax reduction: For homes that have undergone seismic retrofitting, the fixed property tax may be reduced for a certain period of time.

2. Government subsidies

• Municipal subsidies: Many municipalities have subsidy systems for seismic diagnosis and seismic retrofitting. You will need to check the specific details at the office of each municipality.

3. Insurance Benefits

• Discount on earthquake insurance premiums: A discount on earthquake insurance premiums may be applied by carrying out seismic retrofitting and meeting the specified seismic standards.

👉Learn more about free houses in Japan: Free Houses in Japan: What To Know [+ Checklist]

👉Note: Tax reduction measures and subsidy systems may have complicated application conditions and procedures. It is highly recommended to check with your local government or relevant institutions for details.

What is the investment and market demand for earthquake-resistant properties?

Market trends show a growing demand among local buyers and foreign investors seeking earthquake-proof structures. For instance, buildings constructed after 1981 have higher resale value and lower maintenance costs.

When making any real estate investment consideration in Japan, it’s important to evaluate building foundation forms and local seismic intensity risks.

Older structures may require seismic retrofitting, while modern buildings comply with the latest anti-seismic structure standards.

👉Read about the cost of buying a house in Japan: How Much Is A House In Japan? From City To The Countryside

👉See also: How To Buy A House In Japan As A Foreigner

Frequently asked questions

What is an earthquake-resistant building in Japan?

An earthquake-resistant building in Japan is a structure designed to absorb and minimize seismic energy using one or more of three core technologies: seismic isolation (menshin, 免震), earthquake-resistant structures (taishin, 耐震), and seismic dampers (seishin, 制振). All buildings constructed after June 1, 1981 must meet Japan's new earthquake resistance standards under the Building Standards Act, which requires buildings to sustain minimal damage in a magnitude 5 earthquake and not collapse in a magnitude 6 to 7 earthquake.

What are the three types of earthquake-resistant building technology in Japan?

Japan uses three main anti-seismic technologies. Seismic isolation (menshin, 免震) uses rubber and lead bearings installed between the building and the ground to absorb seismic energy before it reaches the structure, reducing shaking by 70 to 80%. Earthquake-resistant structures (taishin, 耐震) use reinforced concrete frames and steel-reinforced walls to resist seismic forces through structural rigidity. Seismic dampers (seishin, 制振) use devices installed within the building structure to dissipate seismic energy and reduce building movement.

What is the difference between the old and new earthquake resistance standards in Japan?

The old earthquake resistance standards, which applied to buildings with construction confirmation issued before June 1, 1981, required only that buildings not collapse in an earthquake of JMA seismic intensity 5 or higher. The new standards, which took effect on June 1, 1981 under a revision of the Building Standards Act, introduced a two-phase requirement: buildings must sustain minimal damage in a medium-scale intensity 5 earthquake, and must not collapse in a large-scale earthquake of intensity 6 to 7. Buildings meeting the 1981 standard survived the 1995 Kobe earthquake in significantly higher numbers than older buildings.

What is the housing performance labeling system (Taishin Tokyu) in Japan?

The housing performance labeling system (耐震等級, Taishin Tokyu) rates buildings on a three-grade scale for seismic resistance. Grade 1 (standard) means the building can withstand seismic forces that occur roughly once every few hundred years. Grade 2 (higher resistance) means the building can withstand seismic forces 1.25 times that of Grade 1. Grade 3 (highest resistance) means the building can withstand seismic forces 1.5 times that of Grade 1. Grade 3 buildings are typically required for hospitals and emergency response facilities that must remain operational after a major earthquake.

What are the financial benefits of buying an earthquake-resistant building in Japan?

For new properties, buyers may qualify for a mortgage tax deduction of 0.7% of the loan balance per year for up to 13 years, reduced registration and real estate acquisition taxes for long-term quality homes, local government construction subsidies, and earthquake insurance premium discounts of 10 to 50% depending on the building's seismic performance rating. For used properties with seismic retrofitting, buyers may claim an income tax deduction of 10% of retrofitting costs (up to 250,000 yen) and reduced fixed property taxes for a set period.

How do I check if a property in Japan meets the new earthquake resistance standards?

Request four documents when purchasing a property in Japan. The certificate of inspection (建築確認証明書, Kenchiku Kakunin Shoumeisho) confirms that the building design met seismic standards at the time of construction. The earthquake resistance standards compliance certificate (耐震基準適合証明書, Taishin Kijyun Tekigou Shoumeisho) certifies whether the building meets the new standards. The inspection report provides details on the building's seismic resistance and any retrofitting carried out. The real estate disclosure report must list any known structural issues or earthquake damage.

What is seismic retrofitting and when is it needed?

Seismic retrofitting (耐震改修) is the process of upgrading an existing building's structure to improve its earthquake resistance. It is typically needed for buildings constructed before June 1, 1981 under the old earthquake resistance standards, which were not designed to withstand intensity 6 to 7 earthquakes. Retrofitting may include adding reinforced walls, installing seismic dampers, or upgrading foundations. Many municipalities offer subsidies covering 30 to 50% of retrofitting costs. After retrofitting, owners may qualify for income tax deductions and earthquake insurance premium discounts.

What should foreign investors know before buying earthquake-resistant property in Japan?

Foreign nationals can purchase property in Japan without restrictions. When evaluating any property, confirm the construction confirmation date to determine whether it falls under the old (pre-June 1981) or new (post-June 1981) earthquake resistance standards. Properties built before 1981 may require seismic retrofitting, which adds cost but can unlock tax benefits and lower insurance premiums. For non-resident owners, a Japanese tax representative must be appointed for annual property tax payments. Mortgage eligibility and loan conditions may differ depending on residency status and employment type.

In closing

Earthquake-resistant buildings in Japan offer long-term value, safety, and financial advantages.

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• Home insurance point of contact and quote provider

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• Domestic point of contact for authorities (required by law)

• Bill pay support for property tax payments

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• Manage important property documents and notifications in one place

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