Across the European Union, buildings occupy a central role in environmental and climate policy. They account for roughly 40% of annual energy consumption and 36% of greenhouse gas emissions from the energy sector. While new construction techniques promise highly efficient future structures, more than 85% of the buildings standing today are expected to remain in use by 2050. This longevity makes the renovation of existing stock a critical lever for achieving climate neutrality.
The European Green Deal targets a net 55% reduction in greenhouse gas emissions by 2030 compared with 1990 levels. For buildings, this translates into a 60% cut in operational emissions. The EU’s “renovation wave” initiative aims to at least double the current 1% annual energy renovation rate by 2030, with deep energy retrofits capable of reducing energy use by 60% or more. These energy upgrades often coincide with routine renovations addressing structural wear, safety, and comfort issues.
However, focusing solely on operational efficiency overlooks the significant climate impact of embodied emissions—those generated during the extraction, processing, and manufacture of building materials. Estimates suggest that 20–25% of the life cycle emissions of the current EU building stock are embedded in materials. Circular economy principles, which emphasize extending material lifespans, maximizing reuse, and minimizing waste, offer a pathway to reduce these emissions while conserving resources.
The EU’s circular economy action plan identifies the built environment as a priority sector. Proposed revisions to the Construction Products Regulation will require products to be more durable, repairable, recyclable, and easier to remanufacture. This aligns with a growing recognition among industry stakeholders that a life cycle perspective is essential. As the World Green Building Council notes, “Knowledge of buildings’ life cycle greenhouse gas emissions is therefore important from both policy and industry perspectives.”
A recent modelling exercise examined ten circular renovation actions across diverse building types in EU Member States and Norway. These actions fall into three clusters: increasing lifespans, reducing material consumption, and using new-generation materials. Examples include converting underused office space to residential use, replacing short-lived components with longer-lasting alternatives, delaying demolition through structural repairs, and designing for disassembly so components can be reused.
Material efficiency measures feature prominently. Maximizing recycled content in renovation materials reduces demand for virgin resources, which are more greenhouse gas intensive to produce. Prefabricated facades can cut material use by around 25% compared with conventional methods. Reuse optimization—through decontamination and minor repairs—further displaces the need for new materials.
The modelling applied three scenarios: a baseline continuation of current renovation rates, a policy-compliant acceleration aligned with the renovation wave, and an ambitious scenario in which all buildings are renovated by 2050. Results indicate that actions extending building lifespans deliver the largest material and emissions savings, primarily by avoiding the need for new construction. Increasing the intensity of use—such as creating multipurpose spaces—also yields substantial reductions, reflecting the concept of energy sufficiency highlighted by the IPCC.
Some measures require trade-offs. Long-lasting materials may be heavier and more carbon-intensive to produce, resulting in short-term emission increases. Yet over extended periods, such as to 2070, they deliver net savings by reducing the frequency of future renovations. This underscores the strategic choice between rapid short-term reductions and maximizing long-term benefits.
Actions in the reduced material consumption cluster, particularly high-quality recycling, show strong potential in accelerated renovation scenarios. By contrast, bio-based materials and green roofs or facades, while renewable and offering co-benefits like cooling, biodiversity, and stormwater management, can have higher initial material mass and embodied emissions than conventional alternatives. Still, their broader environmental advantages make them attractive within a sustainability framework.
The findings suggest that a “circular renovation wave” could simultaneously minimize resource use and cut greenhouse gas emissions. With embodied emissions set to represent a larger share of total building emissions as operational efficiency improves, integrating circular principles into renovation strategies becomes increasingly important. The EU’s planned whole life cycle performance roadmap reflects this shift, aiming to reduce emissions from buildings by 2050 through both operational and embodied pathways.