NOVAC CO., LTD.
Japanese general contractor headquartered in Himeji, Hyogo, operating civil engineering (public works) and building construction (private-sector) businesses nationwide.
Last updated September 29, 2026
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Overview
NOVAC CO., LTD. (株式会社ノバック) is a Japanese general contractor headquartered in Himeji, Hyogo Prefecture, with a Tokyo head office serving as its eastern command center. The company operates two main business segments: civil engineering centered on public works, and building construction centered on private-sector projects. Its civil engineering work covers roads, bridges, dams and tunnels, while its building and renewal work spans condominiums, hospitals, schools, factories and commercial facilities across Japan. The company was founded in April 1965 in Himeji as Otani Construction Co., Ltd. (大谷建設株式会社) with capital of 1.5 million yen, initially for residential land development, building and leisure facility land development. It obtained its Hyogo Prefecture construction business registration in July 1965 and expanded steadily, opening an Osaka office in 1972, receiving national construction minister permission in 1974, and relocating its head office within Himeji in 1978 and 1987. In 2003 it changed its name to NOVAC CO., LTD. and took over the civil engineering and building businesses of Marubeni Construction Co., Ltd., establishing branches in Hokkaido, Tohoku, Niigata, Tokyo, Yokohama, Shikoku and Kyushu. It listed on the Second Section of the Tokyo Stock Exchange in March 2022 and moved to the Standard Market in April 2022 following the exchange's market restructuring. NOVAC positions itself as a balanced mid-tier general contractor whose civil engineering segment is almost entirely public works while its building segment focuses on private-sector projects, a mix intended to minimize the impact of economic and social fluctuations. It emphasizes technical strength across both civil engineering and building fields, with a high number of qualified engineers, and has obtained ISO 9001, ISO 14001 and ISO 45001 certifications. In February 2025 it acquired all shares of TOMTEN Co., Ltd., making it a subsidiary. The company marked its 60th anniversary in April 2025 and pursues a medium-term vision called "NOVAC VISION" targeting the fiscal year ending April 2027, focused on raising brand recognition, expanding its business area, strengthening governance, sustainability, quality and technology, and advancing digital transformation.
History
NOVAC CO., LTD. was founded in April 1965 as Otani Construction Co., Ltd. (大谷建設株式会社) in Himeji, Hyogo Prefecture, with capital of 1.5 million yen. Its initial purpose was land development for private housing and for building and leisure facilities. In July 1965 it registered as a construction business with the Hyogo Prefectural Governor for civil engineering and building works. In March 1972 it registered a first-class architectural design office and opened an Osaka office (now Osaka Branch). In May 1973 it obtained a Hyogo Prefectural Governor's construction business permit covering civil engineering, building, paving, landscaping and water supply facilities, and in September 1973 it obtained a real estate transaction business license. In September 1974 it received permission from the Minister of Construction for the same categories. In March 1978 it relocated its head office to 90 Horihori, Himeji, and in October 1987 it moved to its current location in Himeji. In October 1986 it established a subsidiary, Shindai Construction Co., Ltd., in Kobe with capital of 20 million yen to pursue small and medium-sized government civil engineering projects in Kobe. In September 1990 it opened a Fukuyama Branch (now Hiroshima Branch), in February 1994 a Kyoto Office (now Kyoto Branch), and in May 1996 a Nagoya Branch. In December 1997 it obtained ISO 9002 (now ISO 9001) certification for quality management and quality assurance. In September 2000 it added tobi/doboku (scaffolding and earthworks) and dredging to its construction minister permission. A major turning point came in 2003. In August 2003 the company changed its name to NOVAC CO., LTD. In September 2003 it took over the civil engineering and building businesses of Marubeni Construction Co., Ltd., establishing a Hokkaido Branch (closed September 2009), Tohoku Branch, Niigata Branch (closed May 2010), Tokyo Head Office, Yokohama Branch, Shikoku Office (now Shikoku Branch) and Kyushu Branch. It also took over construction material recycling and snow removal businesses in the Hokkaido area. In December 2003 it added steel structures to its national construction minister permission, and in December 2004 it added piping and mechanical equipment installation, obtained a national real estate transaction business license, and discontinued the Hokkaido building material recycling and snow removal businesses. In October 2005 it transferred all shares of Shindai Construction Co., Ltd., making it a non-subsidiary. In November 2010 it obtained ISO 14001 environmental certification. In December 2018 it was selected by the Ministry of Economy, Trade and Industry as a "Regional Future Leading Company." In March 2019 it added demolition to its national permission, and in October 2019 it added electrical works. In March 2022 NOVAC listed on the Second Section of the Tokyo Stock Exchange, and in April 2022, following the exchange's market restructuring, it moved to the Standard Market. In February 2025 it acquired all shares of TOMTEN Co., Ltd., making it a subsidiary. In August 2025 it obtained ISO 45001 certification for occupational health and safety. The company celebrated its 60th anniversary in April 2025 and pursues the "NOVAC VISION" medium-term vision targeting the fiscal year ending April 2027.
Founded as Otani Construction Co., Ltd. in Himeji, Hyogo, with capital of 1.5 million yen
Registered as a construction business with Hyogo Prefecture (civil engineering, building)
Registered first-class architectural design office; opened Osaka Office
Obtained Hyogo Prefectural Governor construction business permit (civil engineering, building, paving, landscaping, water supply)
Obtained real estate transaction business license
Obtained Minister of Construction permission
Relocated head office to Horihori, Himeji
Established subsidiary Shindai Construction Co., Ltd. in Kobe
Relocated head office to current location in Himeji
Opened Fukuyama Branch (now Hiroshima Branch)
Products and positioning
Mid-tier general contractor with a balanced portfolio of public-sector civil engineering and private-sector building construction, emphasizing technical capability and stable management.
Civil engineering works
Roads, bridges, dams, tunnels and other public infrastructure
Building construction
Condominiums, hospitals, schools, factories, commercial facilities
Renewal and renovation
Renewal works for buildings and facilities
Land development
Residential and leisure facility land development
Sources5 sources
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