Buildable Design Score Index (BS Index) / Constructability Score Index (CS Index)

Buildable-Design Score (BS) Index


  • The BS Index serves as an indicator for tracking the performance of design firms with respect to buildable design.
  • The BS Index is only applicable for firms in the design disciplines of Architecture and Civil & Structural Engineering.
  • A design firm’s BS Index is derived based on its as-built Buildable Design Scores for the latest 5 completed projects in the last 3 years.

Computation methodology

bs index

Constructability Score (CS) Index


The CS Index of each contractor is derived based on their C-Scores (Constructability Scores) of the latest 5 completed projects in the last 3 years. A contractor with a high CS Index will mean that the contractor has performed well in terms of adopting labour-saving construction methods and technologies in their projects.

Computation methodology



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