Expert interview for features and demands of systematic retrofitting of urban residential buildings in hot summer and cold winter zone

The performance and functional problems of the old urban residential buildings (OURB) in the hot summer and cold winter zone are very complicated without comprehensive theoretical research considering both building features and retrofitting demands from residents. To clarify the features and demands of systematic retrofitting of OURB in this region, 12 experts with more than five years of experience in policymaking, technologies, engineering and design for the retrofitting of OURB are investigated by the semi-structured interview method to collect qualitative data on their experiences and opinions based on the systematic retrofitting theory of existing residential buildings. Consensus and disagreement analysis of the interview results indicates that the features of OURB include low indoor comfort level and living quality, various preferences from residents, and a lack of incentive policy for retrofitting. Demands of systematic retrofitting of OURB are revealed as improvement of building living comfort and functions, including lift installation, retrofitting of windows and roofs, and winter heating systems. Comparatively, energy conservation and low-carbon careers are not attractive to residents. This research can provide reliable information from authoritative experts to contribute to the future development of systematic retrofitting of OURB and relevant policymaking.