nikken.jp is a comprehensive professional consultancy group providing one-stop service for a large variety of planning, design and management. The group consists of the following companies.

• Nikken Sekkei LTD.
• Nikken Sekkei Research Institute
• Nikken Sekkei Civil Engineering LTD.
• Nikken Sekkei Management Solutions, INC.
• Nikken Sekkei Construction Management, INC.
• Nikken Housing System CO.,LTD.
• Nikken Space Design LTD.
• Hokkaido Nikken Sekkei CO.,LTD.