The architectural design project for a new detached Accessory Dwelling Unit (ADU) to a duplex residence focuses on creating an independent living space that complements the existing structures while providing additional functionality and versatility. This project involves designing a self-contained unit that includes essential amenities such as a kitchen, bathroom, living area, and bedroom. The ADU is crafted to blend aesthetically with the architectural style of the duplex, ensuring a cohesive look across the property. Emphasis is placed on maximizing space efficiency within the ADU, using innovative design solutions to create a comfortable and livable environment in a compact footprint. This new detached ADU offers a flexible housing option, suitable for use as a rental unit, guest house, or private living space for extended family, thereby enhancing the overall value and utility of the duplex residence.