Informal learning space (ILS) has increasingly become important for higher education. Yet, most studies were conducted on a piecemeal basis, without considering the planning of the campus. This study adopts a systematic and data-driven approach in understanding the types of ILS, preferences and behaviors using a case study in Hong Kong, by first classifying ILS into user-defined types followed by usage behavior for each ILS types. A mixed-method approach was used by conducting qualitative interviews, focus groups, on-site fieldwork observations and large-scale quantitative survey (N = 999) with students. Five types of ILS with unique characteristics were identified. This applied research seeks to suggest development directions and design input for ILS types, with implications for master planning in ILS development, extending to any universities using the same procedure.