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see more details:
archdaily.com/inside-the-keret-house-the-worlds-skinniest-house-by-jakub-szczesny
dezeen.com/worlds-narrowest-house-by-jakub-szczesny
centrala.net.pl/our-work/keret

Polish architect Jakub Szczesny claims to have built the world’s narrowest house, just 122 centimetres across at its widest point. The Keret House is squeezed into a crevice between two buildings in the centre of Warsaw and will provide a temporary home for travelling writers.