The "Healthy and Affordable Construction for Tomorrow Act" mandates the Commissioner of Community Affairs to amend the State Uniform Construction Code to prohibit the combustion of certain high-emission substances in new buildings. Specifically, the bill defines "qualifying substance" as any material that emits 25 kilograms or more of carbon dioxide per million British thermal units when combusted. The prohibition will take effect for buildings under seven stories 12 months after enactment, and for all new buildings regardless of height 36 months after enactment. The bill also stipulates that no certificate of occupancy can be issued for non-compliant structures and outlines specific exemptions for emergency power systems, emergency management facilities, and commercial food establishments.

Additionally, the bill emphasizes the importance of electrification in reducing greenhouse gas emissions and improving public health by minimizing indoor air pollutants associated with natural gas combustion. It requires that areas where qualifying substances are combusted be "all-electric ready" to the fullest extent feasible, and financial considerations cannot justify non-compliance. Municipalities retain the authority to impose stricter regulations regarding fossil fuel use. A joint report from the Commissioner and the President of the New Jersey Board of Public Utilities is also mandated to assess necessary changes to electric rate designs and subsidy programs following the bill's enactment. The act is set to take effect three months after its passage, with provisions for anticipatory actions by the commissioner.