New York mechanical, plumbing, fuel gas & energy codes
New York State adopts the Uniform Fire Prevention and Building Code (Uniform Code) and the State Energy Conservation Construction Code. The 2025 editions, based on the 2024 I-Codes, took full effect December 31, 2025. New York City has its own construction codes.
Quick answer: New York currently uses the 2024 IMC for mechanical work and the 2024 IPC for plumbing (see sources and dates below). A2L status: Allowed: 2025 MCNYS (2024 IMC basis) Chapter 11
Adopted codes
Mechanical
2024
IMC
- Adopted as
- 2025 Mechanical Code of New York State
- Effective
- 2025-12-31
- Source
- NYS Department of State – Notice of Adoption
- Last checked
- 2026-10-27 verified
- Notes
- An optional transition period ran Oct 1 – Dec 30, 2025.
Plumbing
2024
IPC
- Adopted as
- 2025 Plumbing Code of New York State
- Effective
- 2025-12-31
- Source
- NYS Department of State – DBSC FAQ
- Last checked
- 2026-10-27 verified
Fuel Gas
2024
IFGC
- Adopted as
- 2025 Fuel Gas Code of New York State
- Effective
- 2025-12-31
- Source
- NYS Department of State – DBSC FAQ
- Last checked
- 2026-10-27 verified
Energy
Residential: 2024 IECC; Commercial: 2024 IECC & ASHRAE 90.1-2022 (DOE)
IECC / ASHRAE 90.1
- Adopted as
- 2025 ECCCNYS + NYS ASHRAE 90.1-2025
- Effective
- 2025-12-31
- Source
- NYS Department of State – DBSC FAQ
- Last checked
- 2026-10-27 verified
- Notes
- No transition period for the energy code.
A2L refrigerants in New York
The 2025 Mechanical Code of New York State (effective Dec 31, 2025) is based on the 2024 IMC, including its Chapter 11 A2L provisions. 19 NYCRR Part 1223 amends only Chapter 1 titles and some Chapter 15 references (for example ASHRAE 34-2022). It makes no Chapter 11 changes. NYC is separate (see below).
Source: https://dos.ny.gov/system/files/documents/2026/02/19-nycrr-part-1223-2025.pdf · Last checked 2026-10-29 verified
Local amendments & things to watch
- The 2025 code provisions banning fossil-fuel equipment in new buildings (19 NYCRR 1240.6 and Subpart 1229-2) are suspended by court order and cannot be enforced (DOS update, July 2, 2026). verified source
- New York City uses its own 2022 NYC Construction Codes (Plumbing, Mechanical, Fuel Gas and Building), enforced by NYC DOB, not the state code. verified source
- NYC A2L rule: DOB's 1 RCNY §7011-01 (effective May 15, 2026) applies ASHRAE 15-2022 to A2L systems installed after that date. It covers detection, shafts, ventilation and witnessed pressure tests. verified source