REGENSOILL will create a network of five transdisciplinary Living Labs in Birmingham (UK), Budapest (HU), Lille Metropole (FR), Upper Silesia (PL), and a Baltic cluster (EE–LV–LT) to support the clean-up and sustainable redevelopment of brownfields across Europe. Brownfields are areas of land that were previously used for industrial, commercial, or other activities and are now abandoned, underused, or degraded. Their soils are often polluted or damaged by past activities, affecting ecosystems, human health, and opportunities for sustainable urban development. REGENSOILL will contribute directly to the EU Soil Mission goal of achieving healthy soils by 2030 by developing, testing, and replicating solutions together with local stakeholders.