Graphic indication system of the rating results

BEE chart

Built Environment Efficiency (BEE), which is calculated from the assessment results of Q (Built Environment Quality) and L (Built Environment Load), is shown here. The values for Q and L are derived from SQ (the total score for the Q categories) and SLR (the total score for the LR categories). First, the numerator Q is defined as Q = 25(SQ-1) to convert the SQ (from 1 to 5) for the built environment quality into the Q scale of 0 to 100. Then the denominator L is defined as L = 25(5-SLR) to convert the SLR (from 1 to 5) for load reduction into the L scale of 0 to 100.

CASBEE labels buildings with an overall environmental performance assessment rating ranging from C through B-, B+, A and S, corresponding to areas divided according to the line gradient. The ranks correspond to the assessment expressions shown in the figure, using a number of stars for clarity.

Fig7. BEE chart and ranking according to the BEE value in CASBEE

LCCO2 emission bar chart (for housing and building scale)

Lifecycle CO2 is presented as a global warming impact chart in CASBEE for housing and buildings.

Since 2008, CASBEE has included LCCO2 assessment, which evaluates CO2 emissions during the entire building life cycle from construction and operation to demolition and disposal. A new "Standard Calculation" method automatically provides a simplified estimation of LCCO2 based on data already entered in a CASBEE spreadsheet. The feature is especially beneficial to assessors who are not familiar with the LCCO2 evaluation. Additionally, the "Individual Calculation" method can be selected for buildings with more extensive CO2 reduction measures.

LCCO2 performance is indicated by awarding 1 to 5 green stars based on LCCO2 emissions together with the existing BEE assessment (for example, S: 5 red stars). Specifically, the emissions rate (%) for the assessment target is evaluated relative to the LCCO2 emission level of a reference building (one that satisfies evaluation standards for building owners according to the Energy Conservation Law).

The reference values and LCCO2 for the evaluated building are indicated on a bar chart. The emission rate (%) for the assessment subject is displayed, relative to the reference value of LCCO2 emissions as 100%.

  1. Reference value (LCCO2 emissions of a standard building that satisfies the standard for building owners as referred to in the Energy Conservation Law)
  2. LCCO2 emissions of subject building: assessment of building-related initiatives (for example, energy efficiency improvement, use of ecological materials and extended building lifespan)
  3. Assessment of above initiatives + other on-site measures (for example, on-site solar power generation)
  4. Assessment of above initiatives + off-site measures (for example, procurement of green power certificates and carbon credits)

Fig8. LCCO2 emissions bar chart

Bar charts of credits

Assessment results for Q (Environmental quality) are presented as a bar chart per medium-level categories on the upper column for each major category. And the assessment results for LR (Environmental load reduction) are presented likewise.

The figure below shows an assessment result for CASBEE-Building presenting assessment results of Q1 Indoor Environment, Q2 Quality of Service and Q3 Outdoor Environment in the upper column, and LR1 Energy, LR2 Resources and Materials and LR3 Offsite Environment in the lower column.

Fig9. Bar charts of credits

CASBEE Information desk

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Japan Sustainable Building Database(JSBD)