The LEGO Home was designed by "Lydia Reyes, Blueprints for your Dreams" and built by " Castle Rock Homes/ICF Specialist". The exterior walls are Insulated Concrete Forms, known as ICF, and provide a higher quality construction. In addition, the thermal concrete walls help to trap heat and provide more safety to the residents. The exterior walls were installed in one day and the blocks were painted like the famous bricks.