The session provides an overview of the legislative context and requirements for the deep renovation of the European building stock, which has been included in National Energy and Climate Plans and National Long-Term Renovation Strategies. It will also offer an overview of activities conducted in the framework of the project Concerted Action EPBD (CA EPBD). This project addresses various elements of EPBD and aims to contribute to the reduction of energy use in European buildings through the exchange of knowledge and best practices. 

Identifying and collecting relevant data from EPC databases is a crucial step in mapping the energy status of the building stock at various scales. This session will cover different types of data available in EPC databases and the techniques used for data extraction. The challenges and limitations associated with using EPC data to map the energy status of the building stock will also be addressed, including issues related to data quality, reliability, and the need for data standardization and harmonization to facilitate data collection and analysis to develop local, regional and national energy plans. 

This session provides participants with a comprehensive overview of the methods, including techniques and control measures, to assess the accuracy of EPCs. A quantitative procedure for checking the quality of EPC data developed in TIMEPAC will be presented, which focuses on customized rules and scores to evaluate data reliability. It involves comparing the assigned overall EPC score to a predetermined threshold value, beyond which the certificate is deemed unreliable. The methodology is based on standardized, harmonized, and adaptable rules that can accommodate country-specific variations, ensuring the reproducibility of the process.

In the process of assessing building energy and environmental performance in urban areas, clusters are typically formed by categorizing actual or theoretical residential and non-residential buildings based on common characteristics widely recognized by the scientific community. These characteristics encompass various factors such as climatic zones, usage categories, construction periods, size, shape, and key performance indicators. To compile the information to create these clusters, diverse data sources are utilized, including local, regional, or national databases, statistical surveys, and technical standards. The emphasis placed on EPC databases as the primary source of data for cluster formation is of particular importance.

This session will present some of the most recognized approaches to developing building stock energy models with a focus on the model adopted in TIMEPAC.  This model leverages the concept of building typology, which serves as a framework for analysing the energy balance at national or regional scales. This model exploits the EPC database as a supportive instrument to create archetypes to be used in identifying the energy performance of the building stock by means of a bottom-up  approach. A statistical analysis is performed to derive the archetypes after the processes of data quality checking and data clustering presented in the previous sessions.

The renovation roadmap aims at transforming a building towards a zero-emission building by 2050. Despite some challenges associated with the long-term horizon of the renovation passport (e.g. how to deal with the development of costs and technologies within the 2050 time horizon), there are potential benefits for national building renovation plans. This presentation explores the potential benefits of the building specific renovation roadmap as a data source for national building renovation plans. As not only plans but also reports on the evolution of the national building stock will be required, the aspect of tracking the implementation of renovation measures will be of great importance. Options in this regard in connection with the renovation passport are presented.

Accurate modelling of the current energy performance of the building stock is essential to unlock the significant potential for energy savings associated with its refurbishment. This session will provide a comprehensive overview of the entire process, which includes: 1. Establishing a knowledge base on the current state of the building stock through statistical analysis of  EPC databases; 2. Exploring various refurbishment scenarios, considering efficiency measures and retrofit rates, and 3. Comparing the potential CO2 reductions resulting from these scenarios with climate protection targets. The session will cover the processing of EPC data, which encompasses climate conditions, usage categories, geometric features, envelope thermal characteristics, types of HVAC systems, and energy performance indicators.