Attached ADU

An attached ADU is an accessory dwelling unit built as an addition to the primary dwelling, sharing at least one wall with the main structure while providing its own self-contained living space with a kitchen, bathroom, sleeping area, and separate entrance. Because it shares a wall with the primary house, an attached ADU builds on the existing structure's foundation and framing, which can reduce the scope of new construction compared to a fully detached unit. The unit must be functionally independent from the primary dwelling — with its own entrance and complete living facilities — despite being physically connected to it.