The Kumagai Gumi Group aims to create a synergistic effect through collaboration and achieve the one and only "construction service industry."

The Kumagai Gumi Group is a group of specialists that have further advanced and specialized the technologies cultivated by Kumagai Gumi, and built up unique expertise and technical ability. Our group companies coordinate to swiftly provide satisfying services in all stages of the total life cycle of buildings, including surveying, planning, design, construction, operation/continuous management, and renovation.

Overview of Group Companies

Gaeart Co., Ltd.

8-27 Shinogawamachi, Shinjuku-ku, Tokyo 162-0814, Japan



Established: November 1963
Capital: 1 billion yen
Sales: 53 billion 768 million yen (March 2020)
No. of employees: 759 (March 2020)
Representative/representative director: Kenji Yamamoto

Mainly involved in the business of research and development for the new age of roads, such as the production of asphalt mixture and the paving of roads, airports, ports, and bridges, etc. Gaeart thinks about craftsmanship from the perspective of environmentally-conscious technologies and hospitality, and works to enhance technical ability, response capability, and proposal ability while building relationships with customers based on trust, in order to contribute the creation of a safe, secure, and sustainable society.

K & E Co., Ltd.

2-7-2 Fujimi Chiyoda-ku Tokyo 102-0071, Japan 15F, Stage Building



Established: January 2001
Capital: 300 million yen
Sales: 21 billion 410 million yen (March 2021)
No. of employees: 373 (March 2021)
Representative/representative director: Kazuhisa Iwama

K&E specializes in the building renovation business. It provides comprehensive production from planning and design to large-scale renovation work, including building survey/diagnosis, antiseismic diagnosis/antiseismic reinforcement, and the formulation of long-term renovation plans. K&E creates more comfortable spaces across the entire lifestyle of a building and provides construction services that satisfy customers across Japan.

Taiwan Kumagai Co., Ltd.

Room 8 (1408), 12F, No. 205, Section 1, Dunhua South Road, Taipei, Taiwan



Established: December 1974
Capital: NT$ 800 million
Sales: 15 billion 268 million yen (December 2020)
No. of employees: 259 (December 2020)
Representative: Toyohiko Ina

Established in Taiwan in 1974 as a Kumagai Gumi group company. The company has established achievements in the top class of Japanese general contractors in Taiwan, including construction of semiconductor plants and golf courses. Taiwan Kumagai has constructed famous landmarks including the Tao Zhu Yin Yuan Tower, which resembles the structure of DNA, TAIPEI 101, which was the tallest building in the world, the Singuang Station building, which was a pioneering super high-rise building in Taiwan, and the Tachien Dam, which was the largest dam in the Orient at the time of construction.

Technos Co., Ltd.

2-1 Honohara, Toyokawa-shi, Aichi 442-0061, Japan



Established: February 1996
Capital: 470 million yen
Sales: 6 billion 448 million yen (March 2021)
No. of employees: 148 (March 2021)
Representative: Eiji Morita

Technos manufactures steel segments for shield tunnels and temporary construction machinery at its Toyokawa head office plant, as well as designing/producing/installing soil decontamination equipment and leasing for the ACEUP steel frame erection method.
At the Tokyo office, the company constructs unique foundations using a "Quattro Cutter" horizontal multishaft rotating cutter from Germany, and is expanding its environmental business and renovation business in conjunction with Kumagai Gumi.

FATEC Co., Ltd.

2-1 Tsukudocho, Shinjuku-ku, Tokyo 162-8557, Japan



Established: June 1989
Capital: 20 million yen
Sales: 4 billion 768 million yen (March 2021)
No. of employees: 8 (March 2021)
Representative: Takayuki Aono

A comprehensive technology trading company that provides products based on the results of the latest in technical development in the construction industry.

FATEC provides not only products, but also the technology for utilizing those products to the fullest. It also currently conducts technical development regarding maintenance/update mainly in the construction industry and the development of self-walking assisting devices for the welfare/nursing industry. FATEC will continue to contribute to achieving a more comfortable environment and richer society via new products and technologies.

Techno-Space Creates Co., Ltd.

9F Showa Building, 3-12-12 Higashi-Ikebukuro, Toshima-ku, Tokyo 170-0013, Japan



Established: November 1993
Capital: 30 million yen
Sales: 765 million yen (March 2021)
No. of employees: 57 (March 2021)
Representative/president: Naoyuki Yamashita

Techno-Space Creates mainly works on software services utilizing CAD and information systems to create construction plans, applications, and building plans for every stage of a project; from planning to actual construction work. The company is currently collaborating with Kumagai Gumi to promote new business expansion for BIM. It also provides universities and construction companies with education on basic and advanced CAD operations and knowledge of construction for everyone from beginners to those that are able to conduct on-site work. Techno-Space Creates will continue to back up all aspects of construction work.

Technical Support Co., Ltd.

2-1 Tsukudocho, Shinjuku-ku, Tokyo 162-8557, Japan



Established: July 1995
Capital: 70 million yen
Sales: 555 million yen (March 2021)
No. of employees: 41 (March 2021)
Representative: Hiroshi Shimura

Technical Support provides outsourcing of office work to make administrative departments simpler and more efficient and thereby support the core business of the customer. It also provides customers with insurance plans for various requirements as an insurance agency that deals with property insurance and life insurance.