Taisei Corp (Taisei) is involved in civil engineering, building construction, and real estate development. It engages in contract research, technology provision, environmental measurement, and other construction-related services. The company also operates private finance initiatives (PFIs) and other service businesses through various subsidiaries and affiliates. Taisei serves industries related to infrastructure development, commercial and residential construction, and real estate management. It carries out the sale and purchase of real estate, development and sale of building land, and leasing of real estate holdings.

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Taisei has undertaken a range of R&D initiatives focusing on key technological areas such as social and environmental issues, strengthening social infrastructure, regional revitalization, and new frontier business models. The company is investing in technology development related to automation of construction machinery, road floor slab replacement, labor-saving in mountain tunnel construction, and evaluation of construction joint surfaces for concrete dams. Additionally, Taisei is advancing AI-driven technology, timber building initiatives, noise control, ZEB-related technologies, environmentally friendly concrete, energy and water use, PFAS remediation, and digital transformation in construction processes. The R&D unit of Taisei Corp is the Taisei Advanced Center of Technology, which is responsible for managing the company's R&D activities, including technology demonstrations and development initiatives. In FY2025, the company spent JPY19.5 billion on R&D, which as a percentage of revenue stood at 0.9%.