Prefab homes are become more and more popular nowadays. They started from the small and simple ones and became contemporary houses with everything that need inside. Cottage in a Day is the next generation of factory-built, energy-efficient, green homes based on a 14 foot square module. The cottages are built using structural insulated panels for floor, walls and roof, creating an extremely energy efficient building envelope. It comes in different variations with different additional modules. It takes about 5 hours to assemble the modules and get ready to live house. The project is designed by Michael Fitzhugh.