The Keret House, designed by Jakub Szczęsny of Centrala, will be the narrowest house in Warsaw, Poland when it’s completed. Measuring just four feet across at its widest point, the house features designated rooms for sleeping, eating, and working, despite its ultra narrow dimensions. Fitting tightly between two existing buildings, it will have off-grid plumbing inspired by boat sewage technology and electricity lifted from a neighbor. As a way to save space, entry stairs will be able to fold up at the press of a button and become part of the first floor. Although the apartment won’t be winning over architecture lovers for its beauty, it does illustrate how much one could creatively cram into a small space.