A detached accessory dwelling unit (DADU), also known as an ADU, is a secondary housing unit on a single-family lot, often built as a guest house or rental space. Using innovative solutions like Ground Frame Foundations allows for faster construction by skipping excavation, pouring, and backfill, while minimizing environmental impact by preserving soils, water flows, and vegetation. Proven and adaptable, these systems are engineered for diverse projects and tested by IAS-accredited third-party agencies.