Integrated in the construction management activity, the concept of performance has been applied to address the suitability for use of attributes of a building, where each specific characteristic must be assessed in terms of satisfying or not the intended performance. Related to technical and functional performance, emphasis should be placed on the international standard ISO 19,208, which establishes regulatory requirements at the level of the methodological framework, and on the international standards ISO 15,928 and ISO 11,863, which establish regulatory requirements at the building’s level. Regarding the end users technical and functional requirements, the European standard EN 15,643 has relevant contributions and should be considered. Based on this normative framework, the present research work defines a methodology for assessing the technical and functional performance of buildings. Its performance specifications are framed, to satisfy end-users’ requirements and society's expectations. Buildings behaviour in the use phase (e.g., health, safety, convenience, comfort, property protection, contributions to sustainable development) and changes in its performance throughout its life cycle are considered. To apply the developed methodology, a case study composed of a set of existing public buildings in existing in Portugal is used. Thus, demonstrated that the assessment of the technical and functional performance of these buildings (based on the identification of anomalies at various levels), helps in the decision-making process of interventions to be carried out throughout their useful life’s. This methodology also contributes to long-term economic sustainability, as it optimizes the costs of using buildings, as well as future investments in rehabilitation interventions.
