Construction of a building imposes loads on the environment: resources depletion and contamination of air, soil and water, etc.
The environmental impacts of  building construction, partly caused by large consumption of energy, are imposed during the whole life cycle of a building.

Changes in construction, along with changes in design and selection of building materials, are essential to the success of national efforts to minimize environmental impacts and reduce overall energy use and greenhouse gas emissions (GHG).

The contractor has access to information regarding energy consumption during construction of the project to identify activities that consume most energy. The energy profile for a project is developed. Contactors focus on energy intensive activities and develop energy efficient means and methods to minimize energy consumption during construction.