Two Berlin-based architects are experimenting with a new design for tiny houses that will fill some of the German city's unused roof space, says Fast Company writer Adele Peters. The city, which has climbing rents and low vacancy rates, has around 55,000 unused roofs. The Cabin Spacey design is around 250 square feet and is designed to be quickly installed on a rooftop.

The cabin is topped with solar panels for energy and can run fully off the grid, but can also be hooked up to the utilities of the building.

In other underused niches in a city—parking lots, gaps between other buildings—the cabin could help provide even more housing. "We want to let Cabin Spacey rain like Tetris on the city and fill all these small spaces," says Simon Becker, who designed the house with fellow architect Andreas Rauch.

In Berlin, where tens of thousands of people move each year (and where 50,000 refugees arrived in 2015), the city estimates that it will need 20,000 new homes every year, until 2020, to house everyone. It's currently 120,000 apartments and houses short of demand.

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