CASBEE for Buildings

CASBEE for Buildings


Promotion Council of Low Carbon Cities (PCLCC), Institute for Building Environment and Energy Conservation (IBEC)

Type(s) of Tool

Rating SystemsProvide quantifiable sustainability ratings and / or certification for projects or assets.



Lifecycle Phase(s)

Project PlanningGeneral strategy for a project’s delivery is developed., Concept DesignTechnical experts broadly outline the project’s basic characteristics., Detailed DesignTechnical experts further elaborate the Concept Design., ConstructionThe asset is constructed in line with design, budget and timeline., Operation and MaintenanceInfrastructure assets are managed and maintained during their use time.

Open Source


Language Availability

English, Japanese

Country of Origin


Date of Development



The Comprehensive Assessment System for Built Environment Efficiency (CASBEE) helps to understand sustainability conditions of cities across environmental, social and economic aspects. It measures the sustainability of buildings across diverse quality criteria against the environmental load defined as CO2 emissions per capita per year. The resulting sustainability qualification supports the development of effective sustainability measures. The CASBEE tool family for building scale offers a broad range of assessments for single buildings, including new constructions (CASBEE-NC), existing buildings (CASBEE-EB), renovation (CASBEE-RN) and temporary construction (CASBEE-TC), among others.

Tool Outcome

Depending on the outcome of the measurement of quality criteria against the environmental load, the evaluation process results in one out of five ratings: Superior (S), Very Good (A), Good (B+), Fairly Poor (B-) and Poor (C), with each grade represented by a certain BEE value. Besides the certification, the application of CASBEE can also help in understanding the actual conditions of buildings and their progress toward more sustainable development.

Sustainability Criteria

The tool measures the sustainability of cities across the following criteria:
– Nature conservation
– Local environment quality
– Resource recycling
– CO2 sinks
– Living environment
– Social services
– Social, industrial & financial vitality
– Emission trading

Contact Information