New York City has enacted new building codes aimed at promoting energy efficiency, reliability, and long-term cost savings, with mandatory air-leakage testing, enhanced requirements for backup electric heating, and simplified regulatory structures to promote resilience during extreme weather events. The codes, aligned with state codes, will be enforced starting in 2027, with compliance software available in March 2022, expected to provide significant energy savings and improve building envelope performance. The nonprofit Urban Green Council is focused on decarbonizing buildings in NYC through the NYCECC, which includes restrictions on electric resistance heating systems and backup systems, as well as energy efficiency measures beyond the statewide baseline. The NYC Department of Buildings is expected to develop code improvements through performance-based compliance pathways, with building owners already required to meet greenhouse gas emission limits through Local Law 97 and the All-Electric Buildings Law.