Creating attractive living spaces
Environmental consideration in daily life

We will proactively introduce facilities and equipment that minimize the environmental burden stemming from condominiums and contribute to the environment of cities as a whole.

Net Zero Energy House (ZEH) initiatives

The Haseko Group is working to achieve a decarbonized society through the promotion of net Zero Energy House (ZEH), a building with net zero annual energy consumption.

Promotion of ZEH condominiums (ZEH-M) business

As more importance is attached to reducing CO2 emissions in the household sector toward a decarbonized society, it has become essential to promote energy-saving of the house itself. With the understanding that realizing energy-saving condominiums is an area that can greatly contribute to realizing a decarbonized society, the Haseko Group is making efforts to promote ZEH-M.

Promotion of ZEH for condominiums developed in-house

The Haseko Group, including Haseko Real Estate Development, Inc. and Sohgoh Real Estate Co., Ltd., which are engaged in the condominium development business, will promote ZEH for new condominiums to be developed mainly by the Group. In addition, all condominiums for sale and rental condominiums held by the Group will meet the ZEH-M Oriented standard when they are designed in fiscal 2022 or later.
As part of their efforts to date, Haseko Real Estate Development, Inc. and Sohgoh Real Estate Co., Ltd. are registered as “ZEH Developers” and Hosoda Corporation, which is engaged in the detached house business, is registered as a “ZEH Builder.”

*What is a “ZEH Developer”?
A company that plays a central role in forming ZEH-M projects by announcing to the public its “Action Plan for ZEH-M Dissemination,” “Progress,” “ZEH-M Installation Plan,” and “ZEH-M Installation Results” based on the “Collective ZEH Roadmap.”
*What is a “ZEH Builder”?
A company that sets a business goal of increasing the percentage of “ZEH,” “Nearly ZEH,” and “ZEH Oriented” homes in its orders to 50% or more by fiscal 2020, based on the “ZEH Roadmap.”

Definition of ZEH-M
The ZEH Roadmap Examination Committee for Condominiums established within METI defines ZEH-M by the number of floors as indicated below. ZEH for the residential building portion and ZEH for individual dwelling units are assessed individually and independently.

Research and technological development toward the realization of ZEH-M

Haseko Corporation is working on technological development for promoting the building of condominiums with high energy-saving performance and insulation performance, which are necessary for realizing ZEH.

Improved insulation: R&D for the introduction of high insulation specifications

Haseko Technical Research Institute conducted a full-scale experiment to verify anti-condensation performance in a heated environment test lab using high-performance openings (combined sash of aluminum and resin + Low-E multilayered glass) combined with high-performance insulating material. Using the Housing Test Building within the research institute, measurements concerning energy conservation effects and thermal environment of a well-insulated residence were analyzed and data was collected.

Test piece for the thermal environment experiment
Introduction of high-performance equipment: development of heat-pump floor heating with an air conditioner

Joint project with CORONA CORPORATION led to the development and commercialization of the heat pump floor heating with an air conditioner. This product features coordinated control of the air conditioner and the hot water floor heating system using an outdoor heat pump unit, to offer both the speedy heating of an air conditioner and the comfort of a floor heating system. Being eco-friendly and energy-efficient, it meets the requirements of ZEH-M. We are therefore promoting its use in ZEH-M projects.

Coordinated control using a wireless remote control

Environment-friendly initiatives

Initiatives at the design stage

Haseko Corporation proposes environment-conscious designs using the Environmental Consideration Check Sheet and calculates CO2 reduction rates using the CO2 Emissions Calculation Sheet for all its projects to promote the building of environment-conscious condominiums.

Proposing environment-conscious designs

In order to design condominiums taking into consideration the earth and the surrounding environment, Haseko Corporation makes design proposals utilizing the Environmental Consideration Check Sheet, which lists specific design proposals including saving energy and resources, consideration for the surrounding environment, long service life, consideration for human health, reduction in waste, and consideration for the global environment.
In FY2022, targeting “95% or higher adoption rate to the number of proposals made” on the Check Sheet, we made design proposals for 100 projects and obtained the following results.


Number of proposals made Number of proposals adopted Adoption rate
Status of environment-conscious designs 4,712 4,610 97.8%

Calculation of CO2 reduction rate

In order to design condominiums with lower CO2 emissions, Haseko Corporation calculates the CO2 reduction rate by using the CO2 Emissions Calculation Sheet. The Sheet computes the CO2 reduction rate by converting into CO2 emissions the standard value and the design value of primary energy consumption of condominium unit areas and communal areas calculated for each project using a Web program in accordance with the Act on the Improvement of Energy Consumption Performance of Buildings.
In FY2022, targeting “10% or higher CO2 reduction rate (compared to the standard value under the Act on the Improvement of Energy Consumption Performance of Buildings)”, we implemented this initiative for 100 projects and obtained the following results.


Standard value Design value Reduction volume Reduction rate
Status of CO2 reduction rate (tons-CO2/year) 54,705 43,467 11,238 20.5%

Initiatives at BRANSIESTA Urayasu

At “BRANSIESTA Urayasu,” an urban rental condominium completed in February 2023, we have proactively introduced initiatives conducive to “environmental consideration in daily life,” such as the use of wooden structures and environmentally friendly concrete.


Installation of wooden housing units on the top floor

Hybrid structures that combine reinforced concrete with wooden construction are adopted on the top floor. The housing unit is fitted with a sloped roof loft, and wood is used to construct the ceiling and loft lattice. Wood produces less CO2 emissions than other construction materials when manufactured and used for construction and has the added benefit of fixing CO2.

Structural diagram of top floor
Photograph of top floor unit interior
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Adoption of the eco-friendly “H-BA Concrete”

The reinforced concrete structures on the top floor utilize Haseko’s unique H-BA Concrete, an environment-friendly concrete that can reduce CO2 emissions derived from concrete materials while retaining the same performance as ordinary concrete.

Pouring of H-BA Concrete

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Initiatives at Haseko Real Estate Development, Inc.

WORVE is a series of hybrid condominiums with “Work” and “Live”, fully equipped with shared working spaces (open space and private room available) that the residents can utilize 24 hours a day and each facility needed for focused or relaxed work. We were particular about designing each shared spaces, including the working space, aiming to “switch between being focused and relaxed” and remove a “feeling of isolation,” which are big issues in working from home. WORVE was awarded the DBJ Green Building 5 Star Certification for properties, as the building with the “excellent environmental and social consideration,” the highest level in Japan, as a result of the appreciation of advanced initiatives to support residents’ wellness and lifestyles.

Initiatives at Hosoda Corporation

Hosoda Corporation is proactively proposing products taking into consideration lower environmental burden and environmental symbiosis, aiming to create housing and communities that contribute to the global environment.

Promotion of energy-saving and zero-energy houses

Hosoda Corporation is making ongoing efforts to improve the energy-saving performance of houses in order to realize energy savings across society as a whole while improving the quality of life in areas such as convenience and comfort. By improving the insulation performance of exterior walls and windows and controlling the total energy consumption of buildings, its housing performance specifications adopt a standard that satisfies the 2013 Energy Saving Standard.Furthermore, Hosoda Corporation aims to achieve insulation performance that satisfies HEAT20 standard. And the Company is working on supplying “certified low-carbon houses” which reduce CO2 emissions, “long‐life quality housing” which promotes long service lives of buildings, as well as the “Tokyo Zero Emission House,” which, as designated by the Tokyo Metropolitan government, delivers a higher energy-saving performance by securing heat insulation and improving efficiency of facilities. In FY2022, Hosoda Corporation supplied 29 net Zero Energy House (ZEH), which achieves net-zero annual primary energy consumption by delivering higher thermal insulation and energy saving performance while also generating energy for use in the house by solar power or other means.

Initiatives for environmental symbiosis

Hosoda Corporation places importance on creating environment-conscious houses and communities to better the environment surrounding people and housing. Hosoda Corporation has been certified as the System Supply Type under the Environmentally Symbiotic Housing Certification with the objectives of Low Impact, High Contact and Health & Amenity. Its designs focus not only on the physical performance of housing, but also on qualities such as sunshine and wind flow. By planting abundant greenery around buildings, mitigating radiant heat, adjusting and utilizing rainwater, and taking other initiatives, Hosoda Corporation works on creating communities in harmony with the environment.

“Growing Square Kodaira Josuiminamicho Sakuradori ” were sold in lot, by receiving the subsidy under the “Tokyo Zero Emission House Introduction Promotion Project” of the Tokyo Metropolitan government.
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