The Skinniest House in the World (10 Photos) Sandwiched between two buildings from two different time periods, Keret House in Warsaw, Poland measures 152 cm (60 in) at its widest point and 92 cm (36 in) at its narrowest. Built in 2012, the house was designed by architect Jakub Szczęsny. Click to see full answer. Furthermore, where is the narrowest house in the world?Designed by Polish architect Jakub Szczesny the Keret House in Warsaw is considered the narrowest house in the world. The house was built in a gap between two other buildings. It is a fully functional space in which one can live as well as create.Beside above, how wide is the world’s narrowest house? The Keret House in Warsaw, Poland, is the world’s narrowest house that is wedged between two buildings on either side and has a maximum width of 152 cm. The Keret House is the narrowest house in the world. Also to know, what is the smallest house in the world? As Becky Ferreira reports for Motherboard, nanorobotics researchers at the Femto-ST Institute in Besançon, France have built a house that measures just 20 micrometers long, making it the smallest house in the world.Why are Amsterdam Houses narrow?The other distinct feature of Amsterdam’s houses is that they are very narrow. One of the reasons the houses are so narrow is because back in the days taxes were charged based on the size of the building’s facade. So the wider facade, the more tax you pay. Despite that the houses are actually rather deep.