Comprehensive Assessment System for Built Environment Efficiency (CASBEE) is a method for evaluating and rating the environmental performance of buildings and the built environment. CASBEE was developed by a research committee established in 2001 through the collaboration of academia, industry and national and local governments, which established the Japan Sustainable Building Consortium (JSBC) under the auspice of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT).

CASBEE has been designed to both enhance the quality of people's lives and to reduce the life-cycle resource use and environmental loads associated with the built environment, from a single home to a whole city. Consequently, various CASBEE schemes are now deployed all over Japan and supported by national and local governments. This website provides overall information about CABEE, associated with presentative green buildings with CASBEE evaluation.

What's New

December 2, 2015
Release of CASBEE for Cities - Pilot version for worldwide use (2015)

CASBEE for Cities (for worldwide use) is a tool under development to assess the environmental performance of cities around the world. A pilot version of this tool has been released. The news was announced at the 21st Conference of the Parties (COP21) to the United Nations Framework Convention on Climate Change, held in December 2015. For more details, please see News Release. For the manual of the tool, please visit Download Page.

April 16, 2014
Accreditation of the first international building certificate

The Institute for Building Environment and Energy Conservation (IBEC) has certified the "TEDA MSD H2 Low Carbon Building," an office building in Tianjin, China. This building is the first accredited with the CASBEE certificate outside Japan. For more details, please see News Release.

April 10, 2014
New CASBEE book available: "CASBEE - A Decade of Development and Application of an Environmental Assessment System for the Built Environment"

Written in English, this is an introductory book about CASBEE for readers in Japan as well as overseas. The contents include the CASBEE overview, the scope of each tool of the CASBEE family, and the domestic and overseas CASBEE applications. The book can be purchased through the sales commissioner, Japan Publications Trading Co., Ltd. For more information about the book, please see this flyer.

Latest tools

CASBEE is a collective name for a set of different tools of the CASBEE family, each tool tailored in accordance with the type of buildings or the purpose of assessment. Listed below are the latest versions of the tools. The asterisked(*) items are available in English as well, and the English versions are downloadable from Download Page.

Cautions for Use of CASBEE

The CASBEE manuals and assessment software programs, available on the website, are only reference information disclosed for dissemination outside Japan. These tools may not be used to apply for certification to an accredited certification body. You may use the CASBEE manuals and evaluation software programs on your own responsibility. Japan Sustainable Building Consortium (JSBC) and the Institute for Building Environment and Energy Conservation (IBEC) are not liable for any kind of losses occurred from the use of these tools.

CASBEE Information desk

For further information, please kindly contact at;


Japan Sustainable Building Database(JSBD)