The New York State Tenement House Act of 1901 banned the construction of dark, poorly ventilated tenement buildings in the U.S. state of New York. Among other sanctions, the law required that new buildings must be built with outward-facing windows in every room, an open courtyard, proper ventilation systems, indoor toilets, and fire safeguards. One of the reforms of the Progressive Era, it was one of the first laws of its kind in the U.S.