The large-scale management and monitoring of buildings is a complex issue for the heritage buildings holders. Decision Support Systems (DSS) are increasingly applied and studied in the field of building from the scientific and technical communities. Multiple-Criteria Decision Analysis (MCDA), such as Analytic Hierarchy Processes (AHP), are widely used in building performance analysis. On the other hand, AHP are difficult to apply in building field because of the complexity of the problem. This work presents an optimized approach to use AHP integrated in the DSS and applied in the field of the safety and monitoring of R.C. buildings.