Sufficiency in the building sector – for the EU Whole Life Carbon Roadmap

“Sufficiency in the building sector – for the EU Whole Life Carbon Roadmap” is a final report published by the European Commission (Directorate‑General for Environment) and prepared for the Commission by BPIE and Ramboll. It is part of the evidence base supporting the EU Roadmap for the Reduction of Whole Life Carbon (WLC) Emissions of Buildings and focuses on how “sufficiency” measures can reduce WLC by making better use of existing building stock.

The report frames sufficiency as policies and practices that avoid demand for energy, materials, land, and water while maintaining well‑being within planetary boundaries (drawing on the IPCC definition). In the building sector, it emphasises prioritising the existing stock before building new, and highlights three main directions: renovating instead of demolishing and rebuilding; increasing space‑use intensity (reducing under‑occupancy and unlocking “invisible space”); and designing/adapting buildings for more intensive use across time and future needs (flexibility, reversibility).

The report notes that research has identified new construction as a major emissions hotspot alongside operational emissions. It argues sufficiency can simultaneously address climate, environmental and housing crises by reducing material and energy demand, limiting land take, and easing housing shortages. Eurostat housing data (2018) is cited to show 38% of EU buildings are underoccupied, with some Member States exceeding 50–60%, indicating large potential for better use of existing floor area.

Five European initiatives are analysed to estimate how much new construction could be avoided by reusing or adapting existing space. Upscaling from these cases yields estimated avoidable floor area ranging from 19,220 m² (Belgium) to 20,197,763 m² (France) and 23,526,633 m² (Germany), with Poland’s potential estimated up to 12,106,468 m² and an Irish office‑to‑housing conversion saving 3,872–5,808 m² at building level. Compared with annual residential construction volumes, the report estimates that avoided construction could reach roughly 91–172% of one year of new residential floor area in France, 28–348% in Germany, 8–68% in Poland, and around 0.8–1.1% in Belgium.

Avoiding new buildings primarily reduces embodied carbon. Using reference values from technical work supporting the EU WLC roadmap, the report provides indicative ranges of avoided embodied emissions: about 10,763–15,015 tCO2e (Belgium), 5.1–9.6 million tCO2e (France), 0.9–11.2 million tCO2e (Germany), 0.7–5.8 million tCO2e (Poland), and around 1,839–2,759 tCO2e for the Irish office conversion. It also cautions that older vacant buildings can have higher operational emissions than new builds, making energy‑efficiency renovation important; one case scenario in Ireland suggests whole‑life carbon can be around 62% lower than a comparable new build after retrofit.

Beyond emissions, the initiatives are linked to social and economic goals such as affordability, revitalising town centres, reducing loneliness through intergenerational living, and lowering municipal infrastructure costs by limiting greenfield development. The report highlights enabling factors including better vacancy data, capacity in public administrations, advisory networks (e.g., “one‑stop shops”), and aligning sufficiency with other policies (housing, renovation, just transition). Key challenges include upfront renovation costs, disincentives from taxation and rent mechanisms, context‑specific building constraints, and the need for clearer definitions, tools, and monitoring approaches to scale sufficiency policies across Europe.