株式会社がんばる

The construction contractor entered into a construction contract through door-to-door sales with the client for renovation work in Itami City, Hyogo Prefecture, which included various construction phases such as temporary work, demolition, carpentry, interior partitioning, residential equipment installation, repairs, plumbing, electrical work, eco-cute installation, and exterior painting, primarily converting a first-floor store into a residence. The contractor subcontracted the majority of the work (items 2 through 8) to A, who lacked construction business licensing, under a basic agreement, and allowed A to perform the work collectively. The contractor provided A with a business card claiming affiliation and designated A as the project manager. During construction, A, supervised by the contractor's chief engineer, proceeded without technical guidance, leading to defects discovered near the project’s end, including uneven steel foundation work, insufficient welding, gaps filled with waste material, and structural weaknesses caused by improper demolition and reinforcement work. The contractor violated the Construction Business Act by subcontracting the main construction work entirely to A without proper oversight, and the subcontractor's inadequate technical guidance resulted in significant defects in the work product.