Adaptation in the state budget

Climate adaptation, preparedness and solidarity features prominently in the Political Guidelines for the new EU mandate, unveiled by Commission President Ursula von der Leyen in July. And with good reason: infrastructures, access to water, food production, life in European cities – to name but a few – are increasingly impacted by the effects of climate change. Europe urgently needs to prepare better for the impact of climate change, was the message in the European Climate Risk Assessment published by the European Environment Agency earlier this year.

To address the growing impacts of heatwaves on economic activities and populations, the adaptation of the building sector is becoming a new imperative. While the question of “how” to adapt has been the subject of numerous studies, the question of “how much” has so far received little attention. To move forward on this issue, we present in this report: an overview of current knowledge regarding the costs of adapting the building sector to heatwaves and the methodology we used to estimate the additional costs of adapting to heatwaves, based on available information and discussions with experts.

Assessing the economic implications of climate policies is essential for steering public action. Sig­nificant progress has been achieved in assessing the costs of mitigation, particularly with the publication in 2023 of the report on the economic implications of climate action. However, as the Cour des Comptes noted in its 2024 annual public report, numerous issues surrounding adaptation continue to emerge. Our recent work has nev­ertheless enabled us to draw five initial conclusions on the subject.