Building whole life cycle carbon reduction refers to reducing or offsetting the carbon emissions of the entire life cycle of a building from construction to demolition. The life cycle of a building includes several stages, including the extraction, production, and transportation of building materials (A1-A3 stages), building construction (A4-A5), building operation (B1-B7), and building demolition (C1-C4). The above stages generate carbon emissions through the use of fossil fuels, electricity consumption, and transportation.

To achieve building lifecycle carbon reduction or even neutrality, it is necessary to minimize carbon emissions associated with each stage of the building's life cycle. This can be achieved through measures such as using sustainable building materials, implementing energy-efficient building design, using renewable energy, and implementing waste reduction and recycling plans.

In addition to reducing carbon emissions, it may also be necessary to offset any remaining emissions by investing in carbon offset projects such as reforestation, renewable energy, or energy efficiency programs. The ultimate goal is to achieve net-zero carbon emissions over the entire lifecycle of the building.