#Japan #Tokyo #Hajime Construction #HW5.0Σ #Seismic Technology

Hajime Construction Introduces the HW5.0Σ for Three-Story Homes

In a bold move to improve residential safety and design efficiency, Hajime Construction Co., Ltd., part of the Iida Group Holdings, announced the patent acquisition of their innovative wall system, the HW5.0Σ, set to launch in June 2026. Based in Toshima, Tokyo, the company aims to meet growing demands for three-story homes while addressing significant challenges related to earthquake resistance and space optimization in urban environments.

The HW5.0Σ, recognized for surpassing a wall strength ratio of 5.0, has achieved the first major ministerial accreditation in Japan for a wooden brace wall system. This proprietary technology integrates high strength, ductility, and rigidity, thereby enhancing design flexibility and reducing costs for residential projects. As urban areas face increasing pressure for effective space utilization, the HW5.0Σ emerges as a solution designed to help builders optimize available land while ensuring safety and comfort for residents.

Key Features of the HW5.0Σ

1. Increased Design Freedom: Unlike traditional wooden brace walls, which often limit structural options, the HW5.0Σ accommodates small openings, internal storage, and equipment routing, making it suitable for narrow homes. This flexibility allows architects and builders greater creativity in planning.

2. Superior Earthquake Resistance: By employing a patented central connection method, the HW5.0Σ minimizes damage to brace materials and columns. This design innovation increases the seismic performance of buildings, providing peace of mind to homeowners in quake-prone areas.

3. Cost-Effective and Quality Stabilization: Utilizing domestically sourced LVL (laminated veneer lumber) for its diagonal bracing, the HW5.0Σ achieves enhanced quality stability. By reducing the amount of wood required, it strikes a balance between high seismic safety and cost reduction, making it an attractive option for builders.

For further details on the HW5.0Σ's structure and application examples, visit the special feature page titled "Beginning Technology" at Hajime Construction's website.

Future Developments

Hajime Construction initially showcased the HW5.0Σ in October 2025 with a three-story condominium in Itabashi, Tokyo, and has since conducted rigorous evaluations to refine the system. Looking ahead, the company plans to expand the range of buildings utilizing this technology while actively promoting its availability to other residential construction firms through partnerships and general sales. Hajime Construction is committed to providing safe, reliable, and comfortable living environments through ongoing technological advancements and higher industry standards.

Overview of Hajime Construction Co., Ltd.

• - Company Name: Hajime Construction Co., Ltd.
• - CEO: Tadami Horiguchi
• - Headquarters: 2-25-5 Minami Ikebukuro, Toshima, Tokyo, 171-0022, Japan
• - Established: February 13, 1967
• - Capital: 3.29 billion yen
• - Business Focus: Residential properties, including custom homes, condominiums, renovations, and investment solutions.

- Ready-Built Homes: Link
- Apartments: Link
- Custom Homes: Link
- Renovations: Link
- Asset Solutions: Link
- Leaseback Plus: Link

As Hajime Construction prepares for the official introduction of the HW5.0Σ, the company continues to enhance the residential construction landscape in Tokyo and beyond.