The adaptive reuse of cultural heritage can contribute to sustainable development and circular economy, preventing waste production and resource depletion by extending the heritage lifespan. This reuse is limited by challenges mostly identified at the case study level. However, further theorising these challenges could enrich the related body of knowledge and contribute to their mitigation. By defining a theoretical framework, this research builds on the cross-sectional analysis of adaptive reuse undertaken in three European cities: Amsterdam, Rijeka, and Salerno. The challenges were identified by representatives of the public, private, knowledge, and non-profit sectors through stakeholder engagement workshops. Examples of challenges common to the three cities are shortcomings in existing approaches; lack of awareness and capacity; cultural heritage interpretation and management; data management; costs; conflicting interests; lack of knowledge; lack of participatory processes; and compliance with regulations and policies. Being identified in diverse European cities, these challenges can be representative within the European region. Arguably, some of these challenges also apply to other regions since they were reported in case studies from Asia, North America, and Oceania. Addressing these challenges could contribute to sustainable development by potentially contributing towards efforts to achieve ten of the Sustainable Development Goals, as some challenges align with some of these goals.

The adaptive reuse of cultural heritage contributes to heritage conservation, leveraging on the heritage potential to enable sustainable development and enhance urban livability. Yet, it is seldom applied as intervention. This research furthers the knowledge on the challenges to the adaptive reuse of cultural heritage. Through the case study of Salerno (Italy) and a participatory methodology, this research organized a stakeholder engagement workshop, facilitating the interaction of stakeholders—representing the public, private, civic, and knowledge sectors, while using a theoretical framework based on the six steps of the UNESCO Historic Urban Landscape approach to adopt a multi-scale perspective. The content analysis of the data reveals 55 themes encompassing challenges and solutions. These themes are presented in a general overview, followed by an in-depth reporting of the five most discussed themes, i.e. knowledge production and management, participation, valorization, approaches, and cooperation. Besides the contribution to science, this research also offers an overview of challenges and possible solutions for prospective stakeholders in the adaptive reuse of cultural heritage, informing future decision- and policy-making activities towards greater sustainable development within the built environment.

Cultural heritage is recognized as a driver and enabler for sustainable development, and its role within the circular economy and circular cities is gaining attention. Its adaptive reuse plays a significant role in this while prolonging the heritage lifespan, preserving the values associated with heritage assets, and creating shared values. The adoption and implementation of the adaptive reuse of cultural heritage practices present challenges at multiple levels. This research aims to identify these challenges and propose solutions to overcome them, considering the post-industrial port city of Rijeka, Croatia, as a case study. The adaptive reuse of cultural heritage practices was assessed through a stakeholder engagement workshop performing a multi-scale analysis using the Historic Urban Landscape approach as an assessment framework. Forty-nine themes were identified by content analysis of the challenges and solutions identified by stakeholders involved in adaptive reuse practices and decision-making in the city. The five most mentioned themes refer to aspects relating to participation, capacity, regulatory systems, economics-finance, and knowledge. These findings provide evidence of challenges for policy-and decision-makers to be addressed in policy-making. Solutions are also suggested to facilitate the adaptive reuse of cultural heritage in the city of Rijeka and similar contexts, such as introducing policies to support participatory decision-making whose absence is a barrier.

Cultural heritage drives and enables sustainable urban development. The adaptive reuse of cultural heritage creates values while prolonging the lifespan of heritage. Similarly, circular economy creates value while extending the useful life of materials and elements through their reuse. Existing studies on adaptive reuse challenges seldom focus on cultural heritage properties, and they are often identified through the engagement of a limited variety of stakeholders, as compared to the actors normally involved in adaptive reuse. Filling this gap, this paper provides a preliminary baseline of challenges faced by the city of Amsterdam from the perspective of various involved stakeholders, and suggests solutions to address them. The participants represented the public, private, knowledge, and third sectors. The methods used were the following: for data collection, a multidisciplinary workshop using the steps of the Historic Urban Landscape approach as an assessment framework applied to multiple scales on adaptive reuse, and for data analysis, manifest content analysis. The results expanded the range of challenges and solutions reported by previous literature on the adaptive reuse of cultural heritage in content and scale by identifying 61 themes—e.g., knowledge and civic engagement. Tools and stakeholders were also identified. These findings provide a reference for future practice, policymaking, and decision-making, facilitating the adaptive reuse of cultural heritage to capitalize on its potential for sustainable development and circular economy.