NYC 1901 Tenement House Act: Landmark Housing Reform

The Tenement House Act of 1901 (New York State Chapter 334) was a watershed law mandating minimum standards for the city's notoriously squalid tenements. Triggered by Jacob Riis's How the Other Half Lives (1890) and the 1900 Tenement House Commission.

Key Requirements

• Light & Air: Every room must have a window opening to the street, yard, or court (not just interior shaft). Minimum court sizes mandated.
• Sanitation: Indoor toilet required for every two families (replacing hall privies). Running water in each unit.
• Fire Safety: Fireproof stairwells, fire escapes, self-closing doors, enclosed elevator shafts.
• Structural: Minimum ceiling heights, foundation standards, basement/cellar habitability rules.
• Overcrowding Limits: Max occupants per room based on cubic feet (400 cu ft/adult, 200/child).
• Ventilation: Mechanical or natural for interior bathrooms.

Enforcement

Created the Tenement House Department (later Dept of Housing & Buildings) with inspection powers. Landlords had to register buildings. Violations = fines, orders to repair, or condemnation.

Impact

Forced "old law" (pre-1901) dumbbell tenements to retrofit or empty. Shaped "new law" tenements (courtyard buildings) still lining Lower East Side, Harlem, Bronx. Model for US urban housing codes. Amended repeatedly; core light/air/sanitation principles remain in NYC Housing Maintenance Code today.