Retrofitting commercial office buildings for sustainability often involves a trade-off between environmental and economic goals. Hence, the integration of Life Cycle Assessment (LCA)and Life Cycle Cost (LCC) methodologies is essential for achieving a balance between environmental and economic performance in the retrofitting and refurbishment of commercial office buildings to assist decision maker to find the best solution. This study presents a comprehensive framework for harmonizing these two approaches to enhance sustainability in the building sector.

LCA evaluates the environmental impacts of retrofit materials, energy use, and waste across the building lifecycle. LCC examines the economic viability, considering upfront costs, operational savings, and long-term financial implications.

The proposed framework addresses challenges in aligning LCA and LCC, such as data inconsistencies, methodological differences, and conflicting objectives in sustainability metrics. It utilizes advanced tools like SimaPro and economic models to analyze environmental impacts and costs.

A case study of a commercial office building retrofit demonstrates the practical application of this framework. It assesses scenarios for material selection, energy efficiency upgrades, and operational changes, highlighting trade-offs between reducing carbon footprints and maintaining cost-effectiveness.

Key findings emphasize the need to balance immediate investment costs against long-term environmental paybacks. Sensitivity analyses play a crucial role in decision-making, as optimizing retrofit strategies requires careful consideration of these trade-offs.

Policy implications include the need for regulatory incentives and standardized practices for merging LCA and LCC. This research contributes to the growing body of knowledge on sustainable building practices, offering practical recommendations for architects, engineers, and policymakers.