In a series first, the finalists must design the interior and exterior of an entire house — a "tiny house" of just 110 square feet. Each finalist must demonstrate ingenious creativity and savvy space-planning skills in order to execute an inspiring home design that is both comfortable and functional. As carpenters from other HGTV and DIY Network shows arrive to help the finalists complete their work, mentor David Bromstad will coach them as they interact with their crew on camera, just as they would in a real HGTV show.