| June 1981 |
Established Regional Environmental Planning Consultant LCC in Yoga, Setagaya-ku, Tokyo |
| March 1990 |
Opened Osaka Branch Office in Takatsuki City, Osaka Prefecture |
| April 1992 |
Company name changed to Regional Environmental Planning LCC |
| October 1994 |
Reorganized into Regional Environmental Planning Inc. |
| October 1994 |
Moved headquarters to Sakurashinmachi, Setagaya-ku, Tokyo |
| April 1996 |
Civil engineering consultant registration |
| May 1999 |
Started GIS business efforts |
| May 1999 |
US ESRI GIS software distributor registration |
| April 2000 |
Opened Hokkaido Branch in Sapporo, Hokkaido Prefecture |
| May 2002 |
Opened Tokyo Headquarters Tohoku Branch Office in Fukushima City, Fukushima Prefecture
(Tohoku Branch from July 2006) |
| April 2004 |
Opened Kyushu Branch in Fukuoka City, Fukuoka Prefecture |
| July 2006 |
Opened Nagoya Branch in Nagoya City, Aichi Prefecture
(Nagoya Branch Office from April 2009) |
| November 2009 |
Reorganized Tokyo Headquarters into Tokyo Branch |
| April 2010 |
Moved Tohoku Branch to Sendai city, Miyagi prefecture |
| October 2010 |
Opened an online store for wildlife damage countermeasure products |
| October 2015 |
Started selling outdoor security products |
| April 2016 |
Opened Osaka Branch Fukuyama Branch Office in Fukuyama City, Hiroshima Prefecture |
| May 2017 |
Wildlife Management leaders and Wildlife Damage Countermeasures leaders are assigned to each branch office |
| April 2021 |
Abolished the Tokyo Branch Office and established the Technical Department (Environmental Research Division / Sustainability Promotion Division) |
| April 2021 |
Osaka Branch Fukuyama Branch Office reorganized into Chushikoku Branch |
