{"data":{"id":"us-nyc/n.y.c.-admin.-code-ebc-d503","jurisdiction":"us-nyc","citation":"N.Y.C. Admin. Code § EBC D503","heading":"D503 Fireproof first floor (MDL 143, 150).","body":"Any existing fireproof first floor, and any existing fireproof second floor where the cellar below the first floor is less than one half the area of the first floor, shall be maintained as fireproof and shall not be pierced.\n\nExceptions:\n\n1. Firestopped penetrations in accordance with Chapter 7 of the New York City Building Code shall be permitted to pierce such floor.\n\n2. Elevator, refuse chute and dumbwaiter shafts meeting the enclosure requirements of Chapter 7 of the New York City Building Code shall be permitted to pierce such floor.\n\n3. Stairs located outside the dwelling that, if enclosed, shall be fireproof, and in a fireproof enclosure with fireproof doors and door assemblies, with the doors self-closing at all openings, shall be permitted to pierce such floor.\n\n4. Stairs extending not more than 1 story shall be permitted to pierce such floor, provided that such stairs are (i) enclosed from all other spaces in the dwelling by fire barriers and horizontal assemblies having a 3-hour fire resistive rating, (ii) provided with vestibules at the top and bottom of the stairs that are at least 50 square feet (4.6. m\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t2\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t) and no larger than 75 square feet (7 m\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t2\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t), and (iii) are provided with and separated by enclosures from all other spaces in the dwelling by fire barriers and horizontal assemblies having a 3-hour fire resistive rating.\n\n5. Stairs in dwellings 3 stories or less in height which are occupied by 2 families or fewer on every story and that are enclosed by fire barriers and horizontal assemblies having a 2-hour fire resistive rating shall be permitted to pierce such floor.\n\n6. No enclosures shall be required for stairs or vertical openings from such cellar or basement, other than exit enclosures, provided all of the following conditions are met:\n\n6.1. such resulting fire area is separated from every other stair accessing upper stories by fire barriers and horizontal assemblies having at least a 2-hour fire-resistive rating;\n\n6.2. a full system of automatic sprinklers is installed throughout the building with a water-flow alarm connected to a central supervising station;\n\n6.3. hard-wired smoke and carbon monoxide alarms or detectors are installed throughout the building as required for new construction in accordance with Chapter 9 of the New York City Building Code; and\n\n6.4. the building’s height and area comply with the height and area limitations of Chapter 5 of the New York City Building Code based on the type of construction.","path":["New York City Administrative Code","Title 28","Chapter 12: The New York City Existing Building Code (effective July 17, 2027)"],"source_url":"https://files.amlegal.com/pdffiles/NewYorkCity/Admin/XML.zip","current_through":"Local Law 2026/135 (enacted August 31, 2026)","vintage":"","retrieved_at":"2026-09-06T02:48:57Z","sha256":"0574ffa6e942ed705ff81daa038a6690d10629e11cc020837680f43cc342a35c","source_id":"us-nyc","stale":false,"prev":"us-nyc/n.y.c.-admin.-code-ebc-d502","next":"us-nyc/n.y.c.-admin.-code-ebc-d504"},"notice":"GroundRules: Original legal text. Not legal advice."}