Contributing to an Annual Reduction of Approximately 1.2 Tons of CO2 Emissions During Occupancy Through the Introduction of High-Insulation Windows and Entrance Doors: Received a Letter of Appreciation for LIXIL's Climate Change Mitigation and Adaptation Project

Keiai Star Real Estate Co., Ltd. (Headquarters: Honjo City, Saitama Prefecture; Representative Director and President: Keiji Hanawa; hereinafter "the Company") endorsed the "Connecting Homes to the Future Project 2025" implemented by LIXIL Corporation (Headquarters: Shinagawa-ku, Tokyo; Director, Representative Executive Officer and CEO: Kinya Seto; hereinafter "LIXIL"). As a result of actively introducing LIXIL's high-insulation entrance doors in its housing development business and other projects, the Company contributed to an annual reduction of approximately 1.2 tons of CO2 emissions (*1) and received a letter of appreciation at its Tokyo headquarters on March 16, 2026.

Background of Endorsement for LIXIL's "Connecting Homes to the Future Project"

Under the vision of "providing a home for everyone," the Company positions environmental conservation as a key management issue and is promoting initiatives toward the realization of a decarbonized society.

As part of this effort, the Company endorsed LIXIL's "Connecting Homes to the Future Project 2025."

By promoting the introduction of LIXIL-made high-insulation entrance doors and sashes in the housing development business and other projects, the Company facilitated energy conservation in homes, contributing to an annual reduction of 1.2 tons of CO2 emissions during occupancy (*1). This achievement was recognized, and the Company received a letter of appreciation from LIXIL.

*1: CO2 emission reduction amount based on the reduction in energy consumption for heating, cooling, and water heaters during the occupancy or use of homes and buildings when replacing conventional products with project-eligible products.

Our Group's Initiatives Toward Realizing a Decarbonized Society

Our Group is actively addressing climate change issues in terms of sustainability. We have promoted the use of domestic timber, which is considered to have lower CO2 emissions during production and transportation, and have changed the standard specifications for all new housing developments to ZEH (Net Zero Energy House) standards to reduce energy consumption. Through these efforts, we aim to balance business growth with the reduction of GHG (*2) emissions, working toward solving environmental issues and building a sustainable society.

Based on our management philosophy of "creating a rich, fun, and comfortable life," our Group will continue to contribute to the development of sustainable regions and society, where future generations can also enjoy rich nature and live with peace of mind, fun, and comfort.

*2: Greenhouse gases such as carbon dioxide and methane.

Future Outlook

Moving forward, in addition to the use of domestic timber and the popularization of ZEH-standard housing, we will continue to expand the supply of environmentally friendly "high-quality yet low-priced design housing," contributing to the realization of a sustainable society and the development of local communities.

What is the "Connecting Homes to the Future Project 2025"?

This project, implemented by LIXIL Corporation, contributes to CO2 reduction in the residential sector (climate change mitigation) through the popularization of high-insulation windows and doors, while also donating 50 or 100 yen for every eligible product sold. The donations are used for emergency natural disaster support and climate change adaptation support to protect children who are most affected by climate change around the world.

About Keiai Star Real Estate Co., Ltd.

With the management philosophy of "creating a rich, fun, and comfortable life" and the vision of "providing a home for everyone," we supply "high-quality yet low-priced design housing."

We aim to expand our market share in the housing development sector through our unique business model of the "KEIAI Platform" and "compact detached houses," which handles everything from procurement to sales.

Our business area covers detached housing development and sales (*) across the country, centered on the Tokyo metropolitan area. Sales for the fiscal year ending March 2025 were 342.5 billion yen (Group consolidated figure; 9,125 units sold annually, including land).

[Company Overview] Company Name: Keiai Star Real Estate Co., Ltd. (Code: 3465, Tokyo Stock Exchange Prime Market) Representative: Keiji Hanawa, Representative Director and President Address: 762-1 Nishitomida, Honjo City, Saitama Prefecture 367-0035 Capital: 4,818 million yen (as of March 31, 2025) Established: November 1990 Number of Employees: 2,664 (Consolidated / as of March 31, 2025) URL: https://ki-group.co.jp/ Business Description: Housing development business, used home renovation business, custom home business, stock business, apartment business, revenue business, condominium business, overseas business, etc.

[Press Release URL] https://ki-group.co.jp/wp/wp-content/uploads/2026/03/2026.03.30_LIXIL.pdf

[Contact for Media Inquiries] Keiai Star Real Estate Co., Ltd., Public Relations Office, Public Relations Section TEL: 03-5299-7575 FAX: 03-5299-7562 E-mail: press@ki-group.co.jp