The Design Duo 'Twin Off' Series in Somerton Park, South Australia, follows Alisa and Lysandra as they build their family homes side by side. Each week, identical rooms in both houses are revealed, showcasing their creative designs. The series revolves around their friendly competition to outdo each other's innovative choices. As the rooms are unveiled, viewers are left guessing which sister's design will stand out. The series captures the excitement of sibling rivalry, creativity, and the journey of crafting dream homes!