A report about the environmental impacts involved in the use of recycled concrete waste as aggregates in new concrete. The environmental impacts were assessed based on a simple LCA using a prefabricated concrete producing company in Sweden as a case study. The results of the LCA revealed that major environmental impacts arised from the crushing and extraction processes as these were diesel fuel intensive. Comparatively, the use of recycled concrete as aggregates in new concrete saw a reduction in the environmental impacts as the need for extraction had reduced with the introduction of recycled aggregates.