Stakeholder Perspectives on Policy, Social, and Organizational Challenges of Sustainable Residential, Multi-Storey Building Retrofitting in Germany

Retrofitting existing buildings is regarded as a main driver of decarbonization, yet retrofitting activities are lagging behind their ambitious goals. This study explores 86 German construction practitioners’ perceptions of organizational, policy, and social challenges to sustainable retrofitting and how those perceptions relate to age, attitude, and their interaction. The primary analyses used OLS moderation models with HC3-robust standard errors and ordered-logit models, which served as robustness checks. Across outcomes, more pro-environment attitudes were associated with fewer perceived challenges, and older practitioners (41–56+) reported higher barrier perception. The attitude × age interaction results indicate that the protective link of attitude was weaker among older respondents, which was significant for policy and social challenges but only marginal for organizational challenges. The model fit was reasonable, at an Adj. R2 between ≈0.56 and 0.72 with acceptable diagnostics. Our results suggest that even motivated professionals can feel constrained, especially among older, senior staff. Practical implications include early tenant engagement to enhance acceptance and foster internal organizational sustainability capacities. Policy instruments such as adult education programmes need to be leveraged to enhance sustainable construction capabilities and reinforce attitudes and behaviours toward sustainable retrofitting. More salient policy communications and guidance can contribute to increasing sustainability orientation and reducing perceived trade-offs with economic goals.