Making now…
- ZEB Services
- ZEB Database
- Overview
- Annual Statistics (Until February 2025)
- Cumulative Annual Statistics (Until February 2025)
- Comparison with the FY2023 Construction Statistics Survey Report (New Construction ZEB)
- Percentage of ZEB in Relation to Total Building Stock Floor Area
- Track Record of Public Building ZEB
- BEI Comparison (ZEB and Model Building Method)
- Analysis of “ZEB” and Nearly ZEB
- Existing Building ZEB Documentation
- Simple Economic Analysis Tool for Existing Building ZEB Renovation
ZEB Services
We provide various types of support to achieve ZEB (net-Zero Energy Building). The links below explain ZEB and our company’s services.
- Overview of ZEB
- Energy performance requirements for new construction
- About new construction ZEB
- About existing building ZEB
- ZEB Corporation’s service details
- Subsidy programs available for ZEB
- ZEB Corporation’s achievements
- Glossary of energy conservation terms for buildings
*Note: Google Slides [English version] will open.
ZEB Database
We provide various data related to ZEBs. Please utilize this information to understand the current state of ZEBs and for design purposes.
Overview
This database was created to understand the current status of ZEB (Zero Energy Buildings) in Japan. The following data was used in the creation of this database:
- BELS (Building-Housing Energy-efficiency Labeling System) case studies from the Japan Housing Performance Evaluation and Display Association
- Construction Statistics Survey Report
- Survey on envelope and equipment design specifications and energy consumption performance of non-residential buildings – Analysis of input/output data from the Energy Conservation Standards Compliance Judgment Program (FY2022) – National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism
When using the BELS case studies from the Japan Housing Performance Evaluation and Display Association, buildings that have obtained BELS certification multiple times for the same building have been excluded as much as possible. This is because there is an increasing number of cases where BELS (ZEB certification) is obtained both at the design stage and the construction stage. Therefore, the number of ZEB cases does not match the number reported in the BELS case studies from the Japan Housing Performance Evaluation and Display Association.
Please check our company website usage guidelines before use. The fiscal year in the annual aggregation uses the BELS evaluation month. Please note that this differs from both the construction start date and completion date. Statistics may be updated during the fiscal year. Please pay attention to the period covered when using the data.
Annual Statistics (Until February 2025)
These are statistics by fiscal year.
Number of Buildings by ZEB Category by Fiscal Year
Buildings receiving ZEB certification have been increasing year by year.
Total Floor Area by ZEB Category by Fiscal Year
The total floor area of buildings receiving ZEB certification has been increasing year by year.
Cumulative Annual Statistics (Until February 2025)
These are statistics showing the cumulative values by fiscal year.
Cumulative Number of Buildings by ZEB Category by Fiscal Year
Buildings receiving ZEB certification are increasing at an accelerating rate.
Cumulative Total Floor Area by ZEB Category by Fiscal Year
The total floor area of buildings receiving ZEB certification is increasing at an accelerating rate.
Cumulative Number of Buildings by New Construction/Existing Buildings by Fiscal Year
Newly constructed ZEB buildings are rapidly increasing, while ZEB certification for existing buildings is lagging behind.
Annual Cumulative Percentage of Existing Buildings (Existing Building ZEB)
Due to the delay in converting existing buildings to ZEB, their ratio to total ZEB buildings is decreasing year by year.
Cumulative Number of Buildings by Floor Area and ZEB Category (New Construction ZEB)
For new construction ZEB buildings, there are many with a total floor area of less than 2,000 m².
Total Floor Area by Floor Area Range and ZEB Category (New Construction ZEB)
Buildings with a total floor area of 10,000 m² or more account for approximately 90% of the total floor area.
Cumulative Number of Buildings by Floor Area and ZEB Category (Existing Building ZEB)
For existing building ZEB certifications, many buildings have a total floor area of less than 50,000 m².
Total Floor Area by Floor Area Range and ZEB Category (Existing Building ZEB)
Buildings with a total floor area of 10,000 m² or more account for approximately 90% of the total floor area.
Cumulative Number of Buildings by Building Use and ZEB Category
Building use refers to the primary use registered in BELS. In cases where a building with multiple uses has obtained separate BELS certifications for different uses, they are consolidated as one entry under the primary use. Residential buildings are included, but these have a primary use as residential and a secondary use as non-residential (such as offices). Office buildings account for the highest number of cases.
Total Floor Area by Building Use and ZEB Category
Factories and similar facilities have the largest total floor area. For buildings other than factories, ZEB Oriented has the largest total floor area among ZEB categories.
Average Floor Area by Building Use and ZEB Category
For factories and similar facilities, there is no difference in average floor area between ZEB categories, with ZEB Oriented having the smallest average floor area.
Comparison with the FY2023 Construction Statistics Survey Report (New Construction ZEB)
This compares new construction from the Construction Statistics Survey Report with new construction ZEB buildings. Since the fiscal year for new construction ZEB uses the BELS evaluation month, there may be a discrepancy with the fiscal year of construction start.
Percentage of ZEB Buildings by Fiscal Year (New Construction ZEB)
The number of newly started ZEB construction projects exceeds 1% [of total construction].
Annual Total ZEB Floor Area (New Construction ZEB)
While the total floor area of newly started construction is decreasing, the floor area of ZEB buildings is increasing.
Percentage of ZEB Floor Area by Fiscal Year (New Construction ZEB)
The construction floor area of ZEB buildings exceeds 20% [of total construction floor area].
Comparison Between Factory/Warehouse and Other Building Uses
The percentage of ZEB buildings is higher for building uses other than factories and warehouses, while the percentage of ZEB floor area is higher for factories and warehouses. ZEB implementation has been led by very large factories and warehouses. Obtaining ZEB certification has become standard for very large factories and warehouses. The challenge is that the percentage of ZEB floor area has plateaued because ZEB certification has not spread to other factories and warehouses.
Percentage of ZEB Buildings (New Construction ZEB)
Percentage of ZEB Floor Area (New Construction ZEB)
Percentage of ZEB Buildings by Prefecture (New Construction ZEB)
The percentages are higher in Tokyo and Kanagawa Prefecture.
Percentage of ZEB Floor Area by Prefecture (New Construction ZEB)
Areas with higher percentages are those where large factories and similar facilities have been converted to ZEB.
Percentage of ZEB in Relation to Total Building Stock Floor Area
Percentage of ZEB Floor Area by Prefecture (Stock Floor Area as of the end of December 2022) After estimating the total building stock floor area, this shows the status of ZEB adoption by prefecture. The stock floor area may be slightly underestimated as it does not include national government facilities. The national average is 0.6%. Chiba Prefecture and Kanagawa Prefecture have higher percentages.
Track Record of Public Building ZEB
Public buildings (national government, local governments, national universities) have been selected to the extent identifiable from the building names published in the database. Buildings with undisclosed names are counted as undisclosed.
Number of Private/Public Buildings by Fiscal Year
This shows the trend in the number of private buildings and public buildings by fiscal year.
Trend in the Percentage of Public Buildings by Fiscal Year (Excluding Undisclosed)
The percentage of public buildings among ZEB certifications is around 20%. Given that public buildings account for only about 5% of newly started construction projects, it is clear that the proportion of public buildings achieving ZEB status is high. The formula used is as follows: Number of Public Buildings / (Number of Private Buildings + Number of Public Buildings)
Annual Private/Public Floor Area (Excluding Factories and Warehouses)
This shows the trend in floor area of private buildings and public buildings by fiscal year. Since there are very few factories and warehouses in public buildings, while the floor area of private factories and warehouses is large, factories and warehouses have been excluded from the aggregation to make the proportion of public buildings clearer.
Trend in the Percentage of Public Building Floor Area by Fiscal Year (Excluding Factories, Warehouses, and Undisclosed Buildings)
The percentage of public building floor area among ZEB certifications is around 20%. The formula used is as follows: Public Building Floor Area / (Private Building Floor Area + Public Building Floor Area)
BEI Comparison (ZEB and Model Building Method)
BEI stands for Building Energy Index, BEI/AC is the BEI for air conditioning, BEI/V is the BEI for ventilation, BEI/L is the BEI for lighting, BEI/HW is the BEI for hot water supply, and BEI/EV is the BEI for elevators. ZEB shows the average values of ZEB buildings to date, which serves as a guideline for ZEB design. The Model Building Method 2022 shows the average values of buildings applied for using the Model Building Method in fiscal year 2022.
National
Cold Regions
Semi-Cold Regions
Warm Regions
Hot and Humid Regions
Annual Trend of BEI
There has not been much change in the BEI trend. BEI/HW (hot water supply) shows an increasing trend.
Analysis of “ZEB” and Nearly ZEB
Number of Buildings by Number of Floors and ZEB Category Number of floors = above-ground floors + basement floors
Overall
Because factories and similar facilities are included, buildings with a large number of floors are also achieving “ZEB” or Nearly ZEB status.
Offices, etc.
For offices, “ZEB” and Nearly ZEB status is achievable up to about 3 floors. Buildings with more floors have difficulty achieving this status because the roof area available for solar panel installation becomes too small compared to the energy consumption of the building.
Efficient Equipment – Average Annual Power Generation per Floor Area Efficient equipment includes power generation from solar power and cogeneration. For “ZEB” and Nearly ZEB, this can be considered mostly annual power generation from solar power. This shows the power generation per floor area required to achieve “ZEB” and Nearly ZEB status.
Existing Building ZEB Documentation
We conduct analysis of approaches toward achieving ZEB for existing buildings, specification development for feasibility studies, and effectiveness analysis. Please utilize these resources for ZEB design and analysis.
Simple Economic Analysis Tool for Existing Building ZEB Renovation
We have developed a web tool that allows building owners and managers to easily simulate the economic viability of converting existing buildings into ZEBs (net Zero Energy Buildings). Please utilize this for your initial assessment.