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 new 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 exposure to indoor air pollutants. It requires that areas where combustion of qualifying substances occurs be "all-electric ready" to facilitate future retrofitting. Financial considerations cannot be used to justify non-compliance with these requirements, and exemptions will be reviewed during major code updates. The bill also clarifies that 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 required to assess necessary changes to electric rate designs and related policies following the bill's enactment.