The health of urban citizens is largely defined by how their living environments are planned, built, and operated, but scientific and policy discourse about sustainable building has often ignored this. Furthermore, while the complex relations between health and the characteristics of built environments require system-orientated thinking and interdisciplinary interventions, they have—until recently—mainly been addressed with conventionally narrow sector-based (mostly technocratic) approaches (e.g., in regard to energy efficiency or carbon reduction). This paper, however, investigates how health co-benefits are perceived by stakeholders in the field of sustainable building in Vietnam. It examines empirical insights collected from a large-scale household survey—with a focus on a green building-certified project case study—conducted in Ho Chi Minh City, Vietnam, six thematic webinars, and eleven expert interviews. Among other things, the paper points out a challenging mismatch between the high importance homebuyers place on green building health benefits, and the focus of stakeholders on energy-saving benefits, which are not necessarily the homebuyers’ most pressing concerns. Therefore, the paper concludes that improved health and well-being should be more strongly considered as co-benefits of green buildings. Equally important is that this paper also brings attention to the essential systemic approach in both academic and practical efforts toward the implementation of the SDG3, to “ensure healthy lives and promote wellbeing for all ages”, and SDG 11, “to make cities and human settlements inclusive, safe, resilient and sustainable”.