A data-driven framework for operational energy performance certification aligned with directive (EU) 2024/1275

In response to the evolving regulatory landscape defined by the recast of the Energy Performance of Buildings Directive (Directive (EU) 2010/31, as amended by Directive (EU) 2018/844 and subsequently recast by Directive (EU) 2024/1275), this work proposes a structured methodology for developing next-generation operational Energy Performance Certificates (NextGen EPCs). These dynamic certificates aim to complement traditional asset ratings by integrating real-time operational data streams into a comprehensive and performance-based evaluation framework. The methodology combines measured energy use, indoor environmental quality (IEQ), infection-risk potential (based on probabilistic airborne transmission models), and life-cycle cost (LCC) assessment into a unified operational profile. It establishes standardized procedures for data acquisition, temporal and climatic normalization, and quality assurance to enable cross-regional comparability. A weighted aggregation mechanism supports the synthesis of heterogeneous indicators into a singular operational rating, designed to be interoperable with Building Information Modelling (BIM) workflows and to feed directly into the Digital Building Logbook (DBL). The framework supports both single building and district level assessments through modular extensions, aligning with the objectives of the Renovation Wave and the EU Green Deal. By addressing the performance gap between design intent and actual operation, this methodology advances the implementation. This paper articulates the conceptual underpinnings framework, offering a forward-looking perspective on how operational data can reshape the next generation of building performance assessment.