greenBIM, a BIM-based LCA integration using a circular approach based on the example of the Swiss sustainability standard Minergie-ECO

University of Applied Sciences Northwestern Switzerland FHNW, School of Architecture, Civil Engineering and Geomatics, Institute Sustainability and Energy in Construction, Institute Digital Construction, 4132 Muttenz, Switzerland

^* Corresponding author: anita.naneva@fhnw.ch

Abstract

There exist hundreds of sustainability certifications for the built environment. The number is expected to rise as the focus on environmental issues increases. However, these certificates are usually carried further through linear-based approaches in a late building phase. They are disconnected from the design practice, while, as shown by the ‘MacLeamy Curve’, design decisions made earlier in the building process strongly affect positive outcomes. As a result, decision-making metrics are limited and the related improvements of the building concepts are minimized. There is an opportunity to bring forward sustainability certifications metrics and benchmarks in a digital built environment. Here, a proof-of-concept of such a circular approach is presented, using the Swiss sustainability standard Minergie-ECO as an example. Life-Cycle Assessment (LCA) calculations are implemented in a digital form, namely Building Information Modelling (BIM). The BIM-LCA integration demonstrates that current prevalent linear approaches can be further refined and turned into circular ones. Hence, the time and effort for their implementation are reduced, and decision-making information is brought in a structured and visual form. Moreover, architects and planners are enabled to apply sustainability metrics in their processes.