A historic area situated within contemporary urban space must adapt to modern lifestyles and aesthetic sensibilities to sustain its vitality and facilitate effective heritage transmission. A key criterion for evaluating adaptation is its ability to fulfill people’s ‘demands’ for it. This paper focuses on people’s demands as its core, employing the post-occupancy evaluation theory and the scene theory to develop a subjective evaluation framework for scenes within urban historic conservation areas. An application case study uses the typical historical area of Foshan, China, as an evaluation framework. The discussion encompasses spatial vitality, extraction of scene elements, construction of an indicator set, satisfaction evaluation, and differences in evaluations across areas and individual indicators. The research findings reveal several key points: (1) People’s attention and demands regarding scene elements in urban historic conservation areas are multifaceted. (2) There is a high degree of tolerance among people towards urban historic conservation areas, with varying preferences for different areas. (3) The approach to area protection and development needs diversification. (4) People’s overall perception of an area is influenced by various elements within the scenes. The application of this evaluation framework can aid in understanding people’s “demands” and their underlying reasons while also providing assistance for future optimization efforts related to urban historic conservation areas. Furthermore, the subjective evaluation framework has potential applicability for research into other historical cultural street areas.