NYC Admin Code › Chapter 2: Housing Maintenance Code › Subchapter 3: Physical and Occupancy Standards for Dwelling Units › Article 1: Lighting and Ventilation

§ 27-2057 Lighting and ventilation in multiple dwellings; general requirements

a. No multiple dwelling shall be so altered as to diminish the light and ventilation of any room in any way not approved by the department.

b. Every required window shall be so located as to light properly all portions of the room.

c. Any obstruction of required light and ventilation shall be unlawful.

Source: NYC Admin Code, as published by American Legal Publishing, the City's official publisher
Last amended: No amendment date in the official history
Checked: Matched the official code on October 1, 2026

Read it on the official site

Official text. How it applies depends on your facts; this is not legal advice.Other laws and court decisions can change how a section applies to you, so treat the text as a starting point.