This publication provides in-depth analyses of the four RESH case studies—Lille (France), Hannover (Germany), Munich (Germany), and Salzburg (Austria)—exploring their unique regional governance structures, housing market dynamics, and policy responses. Each case study examines local challenges like affordability, spatial mismatch, and cross-border cooperation, while highlighting innovative solutions such as Hannover’s integrated regional planning, Lille’s intercommunal housing mandates, and Salzburg’s greenbelt policies. Richly illustrated with maps, data visualisations, and interview insights, the report serves as a technical companion to the main RESH findings, offering detailed evidence for policymakers and researchers