Construction classes.
NYC Admin. Code § 27-269
in effect§ 27-269 Construction classes.
Table 3-3 lists construction classes that shall be established for classifying buildings and spaces by construction in accordance with the provisions of articles fifteen, sixteen and seventeen of this subchapter.
TABLE 3.3
Construction Classes
Construction Group Class
I – Noncombustible I – A – (4-hr. protected)
I – B – (3-hr. protected)
I – C – (2-hr. protected)
I – D – (1-hr. protected)
I – E – (unprotected)
II – Combustible II – A – (heavy timber)
II – B – (protected wood joist)
II – C – (unprotected wood joist)
II – D – (protected wood frame)
II – E – (unprotected wood frame)
Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-48765Fetched: 10/24/2026