Founded in 2013, KOS Architecture and Interiors is a dynamic and evolving practice based in a bayside suburb of Melbourne, Australia. Our journey began with a single visionary, architect Yimmy Kosasih, whose extensive experience, creative vision, and technical expertise established the firm with a vision to create architecture that is for everyone.

At KOS, we specialize in creating architecture that resonates with people and their environments. Our portfolio spans private residences, multi-residential developments, warehouses, commercial spaces, and adaptive reuse projects. Guided by a collaborative and flexible design process, we thoughtfully balance site context, surroundings, client aspirations, and materials to craft spaces that are innovative, functional, and timeless.

Our work embraces locally sourced conventional materials to achieve distinctive and enduring aesthetics. We are passionate advocates of adaptive reuse, blending the charm of the old with the innovation of the new, transforming existing buildings and materials into renewed design statements.

As a boutique practice, we take pride in our personalized approach, fostering close client relationships and delivering tailored solutions. From initial concepts to flawless finishes, small spaces to large-scale developments, we offer comprehensive, cost-effective, and turnkey services that bring dream projects to life.

With creativity, empathy, and a commitment to excellence, KOS Architecture and Interiors continues to design spaces that inspire, connect, and endure.