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We can divide a building’s life-cycle into four different stages: production stage, construction stage, use stage, and end-of-life stage. In the end-of-service the materials can become an environmental burden or have positive impact by feeding them back to the production stage, reducing the extraction of raw materials.

During the production stage, raw materials are extracted, transported and converted into construction materials. The extraction of natural resources has a great impact on the availability of non-renewable resource and might lead to their depletion. Besides, a large amount of water and energy are related to this process. The manufacturing of construction products also requires a large amount of energy as it has been estimated that the construction materials production industry is one of the biggest energy consumer at a global level. Moreover, energy consumption leads to the release of air pollutants.

The construction stage is when the building takes its form. The construction stage of a building requires a considerable amount of energy and materials, and involves a high number of stakeholders.

The use stage is usually considered as the longest in the building life-cycle. This stage includes activities such as maintenance, and it is characterized by circular strategies such as reuse, repair and refurbish to extend the life span of the building. The use stage leads to environmental impact caused by the users and the physical characteristics of the building, i.e. energy and water use and waste generation.

The end-of-service stage in the context of the Circular Economy would mean that the buildings can be safely disassembled into different components, hence they can be reused, repaired, remanufactured or recycled. Since we live in a Linear Economy, the end-of-life of buildings is the demolition process. Demolition creates huge quantities of bulk waste which might be reused, recycled or simply landfilled. The environmental impact from this phase is related to the release of green gas emissions from machinery and transportation, as well as emissions related to landfill disposal.

Source: https://ocw.tudelft.nl/course-readings/3-1-2-life-cycle-of-a-building/