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Abstract This paper exposes, through the case study of the city of Pamplona (Spain), the benefits of employ a system of urban utility tunnels (UUTs) for the smart and sustainable regeneration of historic centres. Governors and technicians of the city of Pamplona faced the challenge and responsibility to protect the historical and cultural heritage of the city and, in turn, to of adapt it to the needs of an ever changing society taking into account the new social and functional needs. This situation motivated the election of a system of UUTs as an optimal solution thinking about the future because it facilitates the maintenance, renewal or expansion of utility networks, while reduces inconvenience to residents and visitors by minimizing works in public space and visual pollution caused by aerial and fixed on facades wiring. This action allows the inhabitants of the historic city centre to have the same opportunities as citizens of new urban developments to enjoy the same quality, or more, of urban basic services and infrastructures. Likewise, in this paper will be presented the main difficulties encountered for the development of the project and the constructive solution finally executed. [ABSTRACT FROM AUTHOR]

Sustainable restoration process is one of the biggest challenges for public and private decision makers in the Cultural Heritage sector. Currently, sustainability assessment methods are well established tools to quantitatively determine their environmental (LCA), economic (LCC) and social (SLCA) impacts from products/service across the entire value chain. Nevertheless, while these life cycle methods are widely applied in many industries and service sectors, they still are at its infancy in the restoration work of Cultural Heritage. The main goal of this paper is to define and build a general framework including all impact indicators related to the restoration work processes to apply experimentally, and for the first time, all the sustainability assessment dimensions together within the Cultural Heritage sector. The ISO 14040 standard under guidelines published by the UNEP/SETAC Life Cycle Initiative has been used as an assessment tool. Then, a CH-LCM Model framework based on a previous work from the author is applied to the real case concerning the restoration of the fortress of Uncastillo (Spain). The data collected from the real case concerning the restoration of the fortress of Uncastillo (Spain) have allowed us to reach two objectives: firstly, to validate the model empirically and, secondly, to identify successful managerial practices for the decision makers. In this respect, the paper shows that the life cycle approach can be considered an effective method for improving innovative managerial practices towards the sustainability, preservation and restoration of Cultural Heritage by assessing the environmental impact, the financial and economic feasibility and the implementation of an engagement strategy for the stakeholders. Finally, we have pointed out a set of valuable recommendations for future actions. [ABSTRACT FROM AUTHOR]