ABSTRAK Perkembangan kota yang pesat mendorong kebutuhan hunian vertikal yang tidak hanya padat guna, tetapi juga layak huni dan berkelanjutan. Konsep Rusunami dengan pendekatan social welfare dan keberlanjutan lingkungan menjadi solusi strategis melalui perancangan yang memperhatikan penghawaan, pencahayaan, energi, air, material, serta ruang sosial. Strategi penghawaan alami diterapkan dengan ventilasi silang, void, balkon, dan monsoon window, sementara pencahayaan didukung skylight dan bukaan ganda. Orientasi bangunan disesuaikan arah angin dominan untuk memaksimalkan ventilasi dan mengurangi panas. Energi terbarukan diperoleh dari panel surya, sedangkan air hujan dimanfaatkan melalui rainwater harvesting. Desain berpanggung, green roof, green wall, serta taman dengan vegetasi penurun suhu mendukung kualitas lingkungan. Material lokal dan daur ulang dipilih untuk efisiensi energi dan kenyamanan termal. Selain hunian, tersedia fasilitas pendidikan, kesehatan, ekonomi, dan ruang bersama untuk memperkuat komunitas. Dengan demikian, Rusunami ini menghadirkan hunian yang fungsional, terjangkau, sehat, inklusif, dan berkelanjutan, sekaligus meningkatkan kualitas hidup masyarakat urban menengah ke bawah. Kata Kunci: Rusunami, kesejahteraan sosial, arsitektur berkelanjutan, kualitas hidup masyarakat urban.ABSTRACT The rapid growth of cities drives the need for vertical housing that is not only space-efficient but also livable and sustainable. The concept of low-cost condominium (Rusunami) with a social welfare and environmental sustainability approach offers a strategic solution through a design that considers ventilation, lighting, energy, water, materials, and social spaces. Natural ventilation is achieved through cross ventilation, voids, balconies, and monsoon windows, while natural lighting is enhanced with skylights and double openings. The building orientation follows the dominant wind direction to maximize airflow and reduce heat gain. Renewable energy is supplied by solar panels, and rainwater is harvested for secondary needs. The stilt-based design, green roofs, green walls, and gardens with temperature-reducing vegetation support environmental quality. Local and recycled materials are applied to improve energy efficiency and thermal comfort. Beyond housing, the Rusunami also provides educational, health, economic, and communal facilities to strengthen social interaction. Thus, this Rusunami presents a functional, affordable, healthy, inclusive, and sustainable living environment, while improving the quality of life for lower-middle-class urban communities. Keywords: Rusunami, social welfare, sustainable architecture, urban community quality of life.