PurposeSustainability considerations are often treated as an add-on to building design, following ad-hoc processes for their implementation. The purpose of this study was to investigate, model and facilitate the early stages of building information modelling (BIM) enabled sustainable building design (SBD) by formalising the ad-hoc working relationships of the best practices in order to standardise the optimal collaboration workflows.Design/methodology/approachFour stages of data collection were conducted, including a total of 32 semi-structured interviews with industry experts from 17 organisations. Fourteen “best practice” case studies were identified, and roles and responsibilities, resources, information exchanges, interdependencies, timing and sequence of events and critical decisions were examined.FindingsThe research classified the critical components of SBD into a framework utilising content and thematic analyses. These components were coordinated explicitly into a systematic process, which followed concurrent engineering (CE) principles utilising Integrated DEFinition (IDEF) 3 structured diagramming technique. Then, Green BIM Box (GBB) workflow management prototype tool was developed to analyse communication and delivery of BIM-enabled SBD in a centralised system.Originality/valueThis study represents an improvement to previous attempts to systematically define the BIM-enabled SBD process for the early stages. The results support the idea that a transparent SBD process, which follows specified communication patterns, can assist in achieving sustainability efficiently in terms of time, cost and effort.

Integration of Building Information Modelling (BIM) and Life Cycle Assessment (LCA) is regarded as useful for making design decisions regarding the environmental and health impacts of building products and materials. This research aimed at studying the process of BIM-LCA integration to assist designers in making sustainable material and product selection decisions in Ghana. A guidance framework for implementation of BIM-LCA supported by energy analysis has been developed to aid optimisation of sustainable design solutions based on simulations using Autodesk Revit as a BIM authoring tool, Green Building Studio and Tally to perform energy and LCA simulations on a hypothetical two-bedroom single-family house. The research considers both operational and embodied carbon effects of the design solution. The framework aligns with the RIBA Plan of Work 2013 Stages 0–2 (i.e. Strategic definition, Preparation and briefing, and Concept design) and presents a systematic approach for BIM-based LCA estimation for the early design stages using the Business Process Modelling Notation. The paper proposes a generic approach which has the potential to incorporate LCA as an integral part to the BIM-enabled design development process. This assists designers in decision-making that consider environmental impacts of materials and energy consumption as part of sustainable building design considerations.

A common barrier to achieving design intent is the absence of information about operational performance during key design stages. This results in uninformed decision-making, which has negative impacts on actual building performance and Whole Life Cost (WLC). It is proposed that Building Information Modelling (BIM) has the potential to assist design decisions at initial stages, if the model can utilize reliable and robust cost and performance data from buildings in use. This paper describes the findings of a research project that has investigated the integration of WLC estimation into BIM processes. Firstly, the research attempts to gather tacit expert knowledge by reverse-engineering unstructured processes to clarify information requirements for WLC assessment. The Integrated DEFinition (IDEF) 3 structured diagramming modelling technique was utilised for process mapping of information flows. As a result, value adding information, and the chain of interdependencies, were determined. The model has informed the development of a decision-support tool that automates prescriptive tasks and streamlines information exchange procedures. The research findings support the idea that BIM can assist the accurate estimation of WLC of an asset, from the early design stages, through the implementation of a structured information exchange. However, source data is fragmented and in propriety formats and further work is needed to standardise and gather performance data and BIM model structures.

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