This research investigates residential thresholds: where building meets landscape, and private interior meets public space. It contributes a visual taxonomy of threshold design tactics that simultaneously engage with the environmental and the social dimensions of sustainability. Following a literature review, LCA tools and certification-based sociocultural criteria are cross-referenced via a design case study in Rissne, Sweden. The research increases knowledge in how to balance ‘thickness’ – rich social life – and ‘leanness’ – minimised energy use and emissions – in sustainable housing.
