A multi-criteria framework for decision process in retrofit optioneering through interactive data flow

Aim of this research is to deliver a system of procedures and instruments that allows comparing different scenarios of restoration
and retrofit of existing buildings applicable each time a relevant decision about the asset has to be made. The system developed
takes advantages of Building Information Modeling (BIM) and Analytical Hierarchy Process (AHP), thus to focus on main
clients’ needs. Decisions about real estate assets are frequently made by managers with incomplete and scattered data, not
sufficient to fully support the decision making process. Using a BIM model as a central repository of information could strongly
support to compare objectively different scenarios and consequently to decide the application of a multi-criteria matrix involving
management, energy, economic and social issues. BIM and BEM (Building Energy Modelling) techniques have a wide potential
and analysis capabilities; however, they are often adopted without an integrated framework, causing missing performances and
costs overrun. The result is a system enabling to analyze the asset, to produce BIM and BEM models ready to include life cycle
data, to evaluate feasible alternatives and scenarios and to extract relevant performance indicators for decision makers’ support.
An existing office building in Milan representing an awkward field for intervention is the case study for the system application.
While the tools and software adopted are commonly used, the system of procedures developed by the authors can be considered
as an ensemble of workflows otherwise typically used independently. Using them together enhance the decision process
providing data on which to set up a strategic plan of the refurbishment considering costs, continuity in occupancy and energy
efficiency.