Square Root Architecture + Design is a Chicago- and Springfield-based architecture and design firm specializing in high-performance and sustainable building design. The firm's initial C3Prefab was one of the first prefabricated sustainable residences in the Windy City and was a prototype of how residential construction can be simultaneously affordable and eco-friendly within an urban context. Their designs use prefab modular components including structural insulated panels (SIPs). This type of flat-pack system is more of a hybrid of onsite and prefabricated construction that both minimizes transportation and erection costs of the prefab units.