The "Healthy and Affordable Construction for Tomorrow Act" mandates significant changes to the State Uniform Construction Code in New Jersey, specifically targeting the combustion of certain substances that contribute to greenhouse gas emissions. The bill defines "qualifying substance" as any material that emits 25 kilograms or more of carbon dioxide per million British thermal units when combusted. It prohibits the combustion of these substances in new buildings under seven stories starting 12 months after enactment, and in all new buildings regardless of height after 36 months. Exceptions are made for emergency power systems, emergency management facilities, and commercial food establishments, with stipulations that any area using qualifying substances must be "all-electric ready" where feasible.

Additionally, the bill emphasizes the importance of electrification for public health and environmental protection, citing the adverse health effects of indoor air pollutants from natural gas combustion. It aims to reduce reliance on fossil fuels, lower utility costs for residents, and mitigate climate change impacts. The Commissioner of Community Affairs is tasked with reviewing exemptions during major code updates and ensuring compliance with the new regulations, which will take effect three months post-enactment. A joint report from the Commissioner and the President of the New Jersey Board of Public Utilities will also be submitted to assess necessary changes to electric rate designs and related policies following the bill's enactment.