N.Y. Multiple Dwelling Law Section 151
Spaces under stairs

1.

It shall be unlawful to have a closet of any kind under any public stair.

2.

The space beneath every stair from the foot of the stair to a point where the soffit is four feet or more above the floor shall be entirely enclosed with unpierced fire-retarded partitions. Such enclosure beneath a flight of public stairs leading from the entrance story to the story next above shall be fireproof.

3.

Any unenclosed portion of the space beneath a flight of public stairs leading from the entrance story to the story next above shall be left entirely open and kept clear and free from encumbrance.

Source: Section 151 — Spaces under stairs, https://www.­nysenate.­gov/legislation/laws/MDW/151 (updated Sep. 22, 2014; accessed Nov. 29, 2025).

Green check means up to date. Up to date

Verified:
Nov. 29, 2025

Last modified:
Sep. 22, 2014

§ 151. Spaces under stairs's source at nysenate​.gov

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