Daiwa House Industry and its subsidiary, Daiwa Landtech, reported that 816 instances of ground survey data falsification and manipulation occurred [1], [2].
The scale of the misconduct suggests a systemic failure in quality control within the company's soil analysis process. Because ground surveys determine the structural foundations of buildings, any manipulation of this data potentially compromises the integrity of construction projects.
According to the companies, the inappropriate behavior took place at the North Japan office of Daiwa Landtech [1], [3]. The misconduct spanned more than a decade, beginning in October 2012 and continuing through March 2023 [2], [4]. Four employees were involved in the falsification, processing, and diversion of the survey data [1], [3].
An anonymous representative from Daiwa Landtech said the actions were driven by a desire to prioritize the processing of work and to minimize the frequency of re-surveys [1]. This indicates that internal pressure to meet deadlines led staff to bypass safety and accuracy protocols.
Despite the volume of falsified reports, the company maintains that the buildings remain secure. A spokesperson for Daiwa House Industry said that at this time, there are no problems with the safety of the properties built after the ground surveys [3].
The findings were made public on July 25, 2026 [1], [4]. The company has not yet detailed specific disciplinary actions for the four employees involved, or outlined a comprehensive plan for auditing the affected properties.
“816 instances of ground survey data falsification and manipulation occurred”
This incident highlights a critical vulnerability in the construction supply chain where the pressure for efficiency can override safety regulations. While the company asserts that the buildings are safe, the long duration of the fraud—spanning nearly 11 years—may trigger wider regulatory scrutiny into how ground survey certifications are audited in Japan.
