Uncovering the architectural DNA of Da Lat: a pattern language approach to urban heritage conservation

Heritage cities face increasing pressures from rapid urbanization, tourism growth, and climate risks, creating an urgent need for approaches that protect cultural and architectural values while supporting sustainable development. This study examines Da Lat, a heritage city in Vietnam’s Central Highlands, as a case to develop a pattern language for urban heritage conservation and development. Through focus group discussions, community validation, and a questionnaire survey using a Balanced Incomplete Block Design (BIBD) with mixed-effects analysis, the research identifies 55 sub-patterns that express Da Lat’s cultural, ecological, and architectural character across scales from the lakefront and public squares to neighborhood structures, pedestrian networks, and roof forms. Findings show that Da Lat’s urban identity is shaped by natural landscapes, colonial heritage, and contemporary socio-economic dynamics. Key patterns such as Access to the Waterfront, Small Public Squares, Pedestrian Streets, and Cascade Roofs illustrate how ecological corridors, community life, and architectural continuity can be preserved and adapted under tourism pressure, climate change, and rapid growth. The study demonstrates how a pattern-language approach can translate international frameworks, including Integrated Conservation, the Historic Urban Landscape (HUL), Community-based and Values-based Conservation, and provide a pathway for Adaptive Reuse and Living Heritage.