What is Life Cycle Assessment (LCA) and how is it used in architectural decision-making?

• A. A plan for estimating project budgets and cash flow.
• B. A metric for determining occupancy comfort indices in offices.
• C. A process for scheduling procurement deliveries.
• D. A method to assess environmental impacts across a product/building life cycle; informs material choices and design decisions.

Answer: (D)

Life Cycle Assessment looks at environmental impacts across the entire life of a building or its materials—from raw material extraction through manufacturing, construction, use, maintenance, and end of life. In architectural decision-making, it provides a common way to compare options on a like-for-like basis, highlighting embodied impacts such as energy, carbon, water use, and other pollutant emissions. This information helps designers choose materials and assemblies with lower overall environmental burden, favor durability, recyclability, and easier end-of-life options, and guides strategies that reduce both construction-related and operational impacts. It also supports meeting sustainability goals and certifications by making the environmental consequences of design choices explicit. Budgets, comfort indices, and procurement timing are important but not the focus of LCA, which centers on environmental performance across the building’s life cycle.