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This study aimed to design a user-participatory methodology to investigate the post-occupancy sustainability of reused historical buildings and to apply it to a case study.

This study was designed in four stages. In the first stage, the sustainability parameters and sub-parameters were determined in the reused historical buildings based on the literature. The second stage included a field study in which the current situation of the study area was analysed, and the users were reached using the survey technique. In the third stage, the data obtained from the user participation were analysed with importance performance analysis (IPA) and an IPA matrix was created. The fourth stage included an evaluation of the results of the analysis and the development of recommendations.

IPA is a supportive method for ensuring the sustainable use of historic buildings. According to the data obtained from the IPA, it was seen that the functional sustainability of the building was achieved to a great extent. At the same time, there were deficiencies in technical and environmental sustainability. In terms of aesthetic sustainability, it was observed that the importance and performance values given by the users were generally consistent with each other.

The originality of this study is that the performance of the reused historical buildings in the process of use was monitored with appropriate parameters, and a user-participated method was proposed that allows improvement suggestions to be developed in line with the results obtained.

The user-oriented reusing of historical heritages is a powerful planning strategy to increase sustainability and provide socioeconomic benefits for cities. The study aims to determine the post-occupancy sustainability of reused historical buildings.

A holistic model was designed by considering expert and user opinions to select the post-occupancy sustainability of reused historical buildings. The proposed model was developed concerning key sustainability indicators (KSI). This proposed model, which integrates expert and user views, is examined in an educational building with significant cultural value in Mardin.

The results of the KSI model indicate that the functional, technical and environmental sustainability of the building are at a medium level, while the aesthetic sustainability is rated as good. An analysis of the differences between importance and performance shows that the largest gap is in functional sustainability, with the smallest gap in technical sustainability. The environmental and aesthetic sustainability indicators show a smaller performance gap than the other two. The results suggest that functional sustainability requires immediate intervention, technical features should be improved based on user needs and aesthetic and environmental sustainability require monitoring but no urgent action.

The originality of the research is that it proposes a model that combines expert opinion and the opinions of building users to monitor the sustainability of the reused buildings throughout the usage process and enables them to be monitored with key sustainability criteria and to develop improvement suggestions in line with the results obtained.