Seizu Corporation Achieves Unprecedented 11 Years of Excellence in High-Performance ZEH Homes

Seizu Corporation, located in Katsushika, Tokyo and headed by President Tatsuya Oikawa, recently celebrated a significant achievement at the 2026 National SW Association Annual Conference held on August 19 in Bunkyo Civic Hall, Tokyo. The company was awarded the Most Buildings Award, recognizing their exceptional application of the Super Wall (SW) construction method, making it the 11th consecutive year they secured the top position among approximately 500 member companies of the SW Association.

What is SW Construction?

The SW construction method, developed by LIXIL Corporation, is a pioneering residential construction technique characterized by its high airtightness, high thermal insulation, and seismic resistance, built upon a wooden framing method. This innovative monocoque structure, combined with high-performance panels, not only enhances resistance against natural disasters like earthquakes and typhoons but also significantly reduces indoor temperature variations with superior insulation properties. SW construction utilizes a planned ventilation system that ensures clean air circulation, thus promoting a healthy and comfortable living environment.

In addition to utilizing the SW construction method's inherent features, Seizu incorporates hybrid water heaters, leading to substantial reductions in energy consumption. The company's efficient design is bolstered by solar power generation systems and battery storage, achieving high-performance residential standards. This commitment has led to numerous accolades, including nine awards at the House of the Year and three consecutive awards at the Tokyo Eco Builders Awards.

The SW Builders Family

Founded in 2004, the SW Builders Family is a nationwide organization devoted to promoting high-performance housing using the SW construction method. The group emphasizes the importance of shared knowledge and collaboration through various events, seminars, and information exchanges, striving for collective growth. At the annual conference, the goal to supply 3,000 homes by 2030 was reaffirmed, positioning Seizu as a pivotal builder within the organization, dedicated to delivering healthy, comfortable, safe, and secure homes to individuals.

Commitment to Performance and Comfort

Seizu's homes, constructed with the SW method, have notably achieved zero damage during the Great East Japan Earthquake, a testament to their robust design. The firm continues to integrate hybrid water heaters, alongside standard solar power systems and battery storage solutions, to enhance energy efficiency. Even in constrained urban spaces in the eastern Tokyo area, Seizu excels in designing homes to maximize solar panel installations without relying excessively on window placements, promoting bright and open living spaces through innovative designs. South-facing windows are equipped with eaves, allowing for optimal solar gain and shading, thereby adapting to seasonal changes while maximizing the quality of housing.

Recognition for High-Performance ZEH Homes

Seizu Corporation has been honored repeatedly in the nationwide House of the Year awards, marking their ninth achievement. Additionally, they received the prestigious Leading Company Award for three consecutive years at the Tokyo Eco Builders Awards, highlighting their excellence in promoting high-performance housing.

Community Collaborations and Outreach

As a community-rooted housing company, Seizu actively engages in promoting high-performance homes and initiatives towards decarbonization. The Katsushika Energy Saving and Renewable Energy Health Housing Promotion Liaison Conference, known as “Katsune,” collaborates with Katsushika Ward to enhance public awareness about these initiatives. These efforts have gained the attention of local government officials, with staff from the Tokyo Climate Change Adaptation Center visiting Seizu's model houses to assess high-performance construction practices, marking them as a top runner in metropolitan initiatives.

Seizu's Vision and Values

The 7th Basic Energy Plan of Japan outlines ambitious targets for energy-efficient residential buildings by 2030, envisioning a scenario where 60% of new homes are equipped with solar power facilities. The building sector accounts for about one-third of the nation’s energy consumption, highlighting the urgent necessity for decarbonization and carbon neutrality in residential construction.

Since its founding in 2001, Seizu has committed to pursuing authenticity, continually seeking insights from cutting-edge countries like Germany and Switzerland regarding energy-efficient homes. The expertise acquired has been disseminated through seminars led by Oikawa, helping to steer the industry. The company also regularly holds workshops to educate consumers about the advantages and significance of high-performance housing.

Seizu’s early commitment to promoting high-performance homes stems from its core value of pursuing true quality. The mission is not merely to sell homes but to protect the well-being of families by ensuring their properties are resilient against natural disasters and temperature shifts. The company aims to pass on valuable housing solutions from generation to generation, ensuring enduring quality that lasts over a century.

Furthermore, Seizu strives to enhance the happiness of not just its customers but also employees and partner companies, contributing positively to the local community. The company pledges to continue providing high-performance homes and expand its outreach efforts in the future.