KenKan Consultants Co., Ltd.
Integrated Consultants Leading Environmental Fields

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Company Overview

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Company Name KenKan Consultants Co., Ltd.
Head Office 2-23-2 Higashi Ikebukuro, Toshima-ku, Tokyo 170-0013, Japan
Establishment January 1983 (Founding April 1966)
Capital ￥250 million  
Business contents Planning on the environment / construction project,
Survey and planning, Design and construction supervision,
Production and sales of materials
Major trading partners Ministry of Land, Infrastructure, Transport and Tourism,
Related Foundation,NEXCO,Local governments,etc.
Registration qualification
  • ・Construction consultant; No. 04-3460 (December 13,2022)
  • ・Geological Surveyor; No. 07-1547
  • ・Surveyor; No. 9-14861
  • ・First Class Architect Office, Governor of Tokyo; No. 37113
  • ・Measurement Certification Business (Concentration); No. 573, Measurement Certification Business (Sound pressure level); No. 15, Measurement Certification Business (Vibration acceleration level); No. 17
  • ・Designated Investigation Institution based on the Soil Contamination Countermeasures Act; No. 2003-3-3005
  • ・Working Environment Measurement Institution, Governor of Saitama; No. 11-47
  • ・ISO Certification; ISO9001(ASR-Q3589)
Officers
Representative Director, Chairman and CEO Hiroshi Kogiso
Representative Director, President and COO Norihiro Kawanabe
Representative Director, Senior Managing Director Yasushi Fukagawa
Senior Managing Director Yukio Koike
Managing Director Hisashi Nakayama
Managing Director Takashi Masuoka
Board Member, Managing Executive Officer Takashi Araki
Board Member, Managing Executive Officer Akira Shimamura
Board Member, Managing Executive Officer Daisuke Nagamoto
Auditors Toshiro Yamada
Auditors Masahiro Seino
Number of Employees 493 people (Engineers 387 people) (As of April 2025)
Group Companies
  • Kensetsukankyo techno service Co.,Ltd.
  • Sankei analysis center Co.,Ltd.
  • ECOTEC Regional Environment Center Co.,Ltd.
  • Tokan research Co.,Ltd.

Amount of sales / Ordinary income

Amount of sales / Ordinary income

Certified Personnel (As of April 2025)

Registered Professional Engineer 229 people
  Engineering Management 51 people
  Civil Engineering 148 people
  Water Supply & Sewerage 1 people
  Environment 18 people
  Applied Science 5 people
  Information Engineering 1 people
  Environmental Engineering 3 people
  Agriculture 1 people
  Mechanical Engineering 1 people
Registered Civil Engineering Consulting Manager 66 people
PhD (Engineering/Agriculture/Science/Fisheries Science) 24 people
Senior Civil Engineer 1 people
1st grade civil engineer  6 people
1st Class Civil Engineer 3 people
1st Class Architect 4 people
1st Class Civil Engineering Works Execution Managing Engineer 19 people
1st Class Landscape Architectural Works Execution Managing Engineer 8 people
Surveyor 17 people
River Maintenance Engineer 10 people
River checker 76 people
Concrete Diagnostic Engineer 2 people
Road Bridge Inspector 2 people
Geotechnical Engineer 3 people
Certified Environmental Measurer 25 people
Certified Weather Forecaster 6 people
Pollution Control Administrator 25 people
Soil Contamination Surveys Technical Manager 5 people
Registered Environmental Education Instructor 1 people
Registered Environmental Counselor 9 people
Environmental Assessor 29 people
Biotope Planners and Builders 92 people
Taxonomic Proficiency Test 40 people
Environmental Restoration Doctor 2 people
Environmental Measurement and Chemical Analysis Engineer 1 people
Tree Doctor 2 people
Certified Urban and Regional Planner 4 people
Information Technology Engineer 21 people
Asbestos Surveyor 3 people
Certified Asbestos Analysis Engineer 2 people

History

April 1966 Establishment
January 1983 KenKan Consultants Co.,Ltd. established at 1-11 Kanda Ogawamachi, Chiyoda-ku, Tokyo
September 1983 Osaka Branch opened
December 1983 Registered as a construction consultant
December 1983 Fukuoka Branch opened
September 1984 Registered as surveying business
January 1985 Sendai Branch opened
February 1985 Sapporo Branch opened
April 1985 Environmental Analysis Center opened
June 1985 Head office relocated to 2-10-10 Yushima, Bunkyo-ku, Tokyo
October 1985 Registered as a Measurement Certification Business (Concentration)
March 1987 Registered as a Measurement Certification Business (Sound pressure level)
May 1987 Hiroshima Branch opened
January 1989 Nagoya Branch opened
June 1991 Head office relocated to 2-17-12 Yushima, Bunkyo-ku, Tokyo
May 1993 Registered as a First Class Architect Office
May 1994 Head office relocated to 2-23-2 Higashi-Ikebukuro, Toshima-ku, Tokyo
April 1995 Registered as a Geological Surveyor
April 1996 Takamatsu Branch opened
July 1996 Omiya Branch (currently Saitama Branch) opened
March 1997 Niigata Branch opened
April 1997 Tokyo Branch opened
July 1997 Fukuoka Branch upgraded to Fukuoka Branch
October 1998 ISO 9001 certification acquired
March 2001 Environmental Science and Technology Center opened
December 2002 Nagoya Branch upgraded to Nagoya Branch
April 2003 Okinawa Branch opened
September 2003 Shizuoka Sales Branch opened
August 2004 Gifu Sales Branch opened
December 2004 Mie Sales Branch opened
April 2006 Each Branch was upgraded to Office and each Branch was upgraded to Branch
July 2006 Fukushima Sales Branch opened
August 2007 Registered as a Working Environment Measurement Organization
February 2008 Tochigi Sales Branch opened
April 2008 Shimane Sales Branch opened
May 2008 Yamanashi Sales Branch opened
May 2008 Kagoshima Sales Branch opened
June 2008 Kumamoto Branch opened
October 2008 Gunma Sales Branch opened
November 2008 Ibaraki Sales Branch was opened
April 2009 Tokushima Sales Branch was opened
April 2009 Toyama Sales Branch opened
May 2009 Kochi Sales Branch opened
January 2010 Kumamoto Branch changed to Kyushu Office Kumamoto Sales Branch
June 2010 Hiroshima Branch Okayama annex opened
July 2010 Osaka Branch upgraded to Osaka Office
July 2011 Kanagawa Sales Branch opened
November 2011 Sendai Branch was upgraded to Tohoku Office
December 2011 Iwate Sales Branch was opened.
August 2012 Hyogo Sales Branch opened
April 2013 Okayama annex upgraded to Okayama Branch
June 2013 Akita Sales Branch opened
August 2013 Oita Sales Branch opened.
April 2015 Miyazaki Sales Branch opened.
June 2015 Ehime Sales Branch opened
September 2015 Kyoto Sales Branch and Nara Sales Branch opened.
June 2017 Kochi Sales Branch upgraded to Kochi Branch
January 2018 Yamagata Sales Branch opened
January 2019 Toyota Sales Branch was opened.
January 2019 Shinshiro Sales Branch opened
July 2019 Hachinohe Sales Branch opened
March 2020 East Shizuoka Sales Branch opened
March 2020 Tono Sales Branch was opened
January 2021 Chiba Sales Branch was opened
February 2021 Yatsushiro Branch opened
May 2021 Saga Sales Branch was opened.
November 2021 Yamaguchi Sales Branch opened
August 2024 Ishikawa Sales Branch opened