Digital construction modelling is enabling life cycle carbon assessment, reshaping how buildings are designed and delivered.
New research demonstrates how integrating Building Information Modelling (BIM) with Life Cycle Assessment (LCA) allows carbon emissions to be quantified across a building’s entire life cycle, from early design decisions to demolition. The approach provides construction professionals and policymakers with detailed evidence to support low-carbon building strategies.
The construction sector remains one of the largest contributors to global carbon dioxide emissions, accounting for more than one-third of energy-related emissions worldwide. In China, emissions linked to construction activities have more than doubled in the past two decades. Despite this scale, assessing whole life carbon during the design stage has remained difficult, limiting the industry’s ability to intervene early and effectively.
New study
The new study addresses this challenge by embedding life cycle carbon analysis directly within a digital building model. Researchers developed an integrated BIM–LCA framework and tested it using a real three-storey reinforced concrete office building in China. The method enables designers to calculate embodied carbon and operational carbon using consistent, standardised data at a level of detail not previously available during early project stages.
“Our goal was to move carbon assessment upstream, into the design stage, where it can actually influence decisions,” said Yujing Yang, corresponding author of the study. “By integrating life cycle assessment directly into a digital building model, designers can see where emissions come from and how to reduce them before a building is constructed.”
Digital model
The digital model captured emissions across four key stages of the building life cycle: material production and transportation, construction, operation and maintenance, and demolition. The researchers aligned the assessment with international life cycle assessment standards and applied region-specific datasets for materials, energy consumption, and transport modes. This ensured that results reflected realistic construction conditions rather than generic assumptions.
Carbon emissions
Analysis of the results revealed that carbon emissions are unevenly distributed across the building life cycle. Embodied carbon from material production represented a substantial proportion of total emissions, with steel, concrete, and cement emerging as dominant sources. Steel alone accounted for nearly half of emissions associated with material production, highlighting its significance in structural design decisions.
Transportation emissions also proved more influential than often assumed. Heavy, bulk materials such as sand generated high emissions when transported over long distances, significantly increasing a project’s carbon footprint. “Our findings show that transportation distance can matter just as much as the material itself,” Yang said. “Sourcing materials locally has enormous potential to cut emissions, especially for heavy materials like sand.”
Operational life
Over the building’s operational life, energy use became the primary driver of emissions. Heating-related energy consumption accounted for almost two thirds of total operational carbon in the case study. This underlines the importance of energy-efficient building design, improved insulation, and low-carbon heating systems when targeting long-term emissions reductions in commercial buildings.
The research team conducted sensitivity analyses to test how changes in key variables affect total emissions. Adjustments to transportation distance, vehicle type, and material sourcing produced significant reductions in embodied carbon. In some scenarios, transportation-related emissions fell by more than 70 percent through the use of local suppliers and lower-emission transport options. These findings reinforce the value of data-driven decision-making enabled by digital construction platforms.
BIM
Importantly, the study’s BIM-based life cycle assessment framework is designed to be transferable. Because it relies on commonly used BIM software and established LCA methodologies, it can be applied to different building types, locations, and regulatory contexts. This scalability makes it relevant for architects, engineers, developers, and public authorities seeking consistent approaches to whole life carbon assessment.
“This study provides a practical roadmap for low carbon building design,” Yang said. “It shows that digital tools can turn climate goals into concrete design choices, helping the construction industry move toward a more sustainable future.”
Increasing pressure
As pressure increases to meet national and international carbon reduction targets, digital construction methods that link BIM and life cycle assessment are likely to play a growing role. By revealing where emissions truly originate, these tools support informed design, procurement, and policy decisions without compromising performance or cost control.
By integrating BIM and life cycle assessment, digital construction enables evidence-based carbon reduction, supporting informed design, procurement, and policy decisions across the full building life cycle.
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