A report stemming from the JustReno project provides a detailed overview of the data gaps that hinder a sound understanding and effective management of Poland’s building stock, with direct implications for energy efficiency planning and renovation strategies. It notes that, although registries such as the Central Register of Energy Performance of Buildings exist and collect energy performance certificates, their coverage is partial and data quality remains uneven. Not all buildings are required to hold a certificate — particularly those occupied by their owners — leaving significant segments of the stock without reliable information on energy consumption, emissions, or basic technical characteristics.

The article further underlines that data governance at the national and local levels lacks robust coordination and digitalisation mechanisms, making it difficult to build an accurate picture of the actual energy performance of the building stock and limiting the capacity to design outcome-oriented policies. Concepts such as energy poverty, vulnerable buildings, and the worst-performing properties are defined, yet their effective measurement remains constrained by the quality of available data.

Strengthening data systems through greater digitalisation, automation, and open access is presented as an essential step to ensure that renovation and energy efficiency strategies in Poland are grounded in solid evidence and enable credible policy monitoring, aligned with climate objectives and the implementation of the Energy Performance of Buildings Directive.