DN Holdings Co Ltd is a Japan-based company mainly engaged in the construction consulting business. The Company provides surveys, planning, design, construction supervision, and consulting services for civil engineering, construction, surveying, geology and soil. The structure maintenance business is engaged in the planning and design of new structures, as well as the maintenance and inspection of existing structures. The social creation business is engaged in the planning and design of transportation, urban, environment and energy systems. The national land conservation business is engaged in the river and sand protection planning, geological surveys, exploration. The overseas and construction management business conducts research, planning, and design work for road and bridge construction projects overseas, as well as construction management in Japan and overseas.
DN HOLDINGS CO.,LTD. 
