CORDER Inc. (Headquarters: Shibuya-ku, Tokyo, Representative Director: Kento Tanabe) announces the release of its "Sekisan AI Platform," which utilizes AI and data specifically for the "sekisan" (estimating) domain, a critical factor in the profitability of the construction industry. Since launching the AI proxy service "Online Sekisan Ka" in June 2025, we have already seen adoption by over 30 general contractors nationwide (including branches) and have supported over 200 companies to date. Now, we are launching an AI platform that achieves "improved estimation accuracy" and "cost optimization" through the utilization of AI and data in estimating, leading the industry's transformation. "Sekisan AI Platform" Service Site: https://corder.co.jp/service/ai-platform/ Changes in the External Environment and Common Challenges Faced by General Contractors Due to changes in the external environment, management is increasingly emphasizing "improving profit margins," while estimating departments are prioritizing "improving estimation accuracy," "optimizing costs," and "reducing workload." Effective Solutions to Challenges To address these challenges, companies are pursuing business reforms through the utilization of AI and data. "Three Walls" Faced by General Contractors in AI and Data Utilization However, as many general contractors engage in AI and data utilization for estimating and system development, numerous real-world voices (examples of failures) have been reported, including: The Wall of Business Understanding A veteran's macro program broke, leading to a request for system development and macro analysis from a system company. However, the system company could not understand the complex, estimating-specific business processes, making implementation impossible. The Wall of Data Accumulation Attempts were made to database estimating data, but due to variations in notation for the same items across different branches or personnel, and the significant burden of data proce