The sustainable housing project on Stocletlaan in Duffel comprises 16 rental apartments. It combines a sober, contemporary architectural language with a compact building volume that closely aligns with the proposed scale and massing of the masterplan. The layout is organised around a central entrance zone, with external access galleries along the street side, creating a clear spatial structure and a distinct hierarchy between public, collective, and private domains. Ground-floor units benefit from direct access via small front gardens, while the upper apartments feature private terraces, adding refinement and liveliness to the façade. Accessibility is fully integrated into the design: all units are step-free and accessible via a lift and generous access galleries, in line with VMSW standards for adaptable housing. Sustainability, innovation, and affordability are achieved through rational architectural principles and well-considered technical choices. The building is conceived as a single, clear volume with simple, coordinated structures, executed in traditional masonry and precast slab systems, contributing to cost efficiency. The energy concept was particularly forward-thinking for its time, featuring heat pumps in a cascade system, supported by buffer tanks and solar panels. Thanks to this integrated approach, the project was selected for Social Housing Day 2019.