This paper provides an overview of a new generation of decision support software that has been developed in the framework of European projects over the past few years for the assessment of different scenarios during renovations or refurbishment of apartment, office, and hotel buildings. The software includes a structured methodology for performing a diagnosis of the existing building condition, modules for load calculations, the assessment of energy conservation potential resulting from different scenarios, including the use of renewable energy sources (RES), and a first cost estimate so that the user can set up the right priorities during the first stages of a building renovation or refurbishment project. In addition, the paper provides a brief overview of the results from pilot case studies from the application of some common RES systems and energy conservation techniques.

Units: SI