Urban development presents significant environmental and social challenges, particularly in cities experiencing demographic decline and population aging. In many urban areas, ongoing land consumption coexists with a large number of underutilized built surfaces. This situation underscores the need for strategies that enhance urban resilience without further spatial growth. This thesis explores the transformation of underused rooftops of low-rise buildings into design opportunities, investigating rooftop activation as a form of regeneration of the urban fabric. The research focuses on the city of Turin, particularly the San Paolo district, where low-rise buildings are interspersed among high-rise residential structures. Compact city theory is adopted as a theoretical framework to interpret density and proximity as qualitative spatial conditions, rather than quantitative measures of urban form.