Energy Efficiency, GHG Emissions  -  February 6, 2025

Boston Sets New Construction Emissions Rule

Boston announced it is the first city in the U.S. to require new buildings to achieve net zero carbon emissions standards upon opening.

Mayor Michelle Wu announced the approval of an amendment to the city’s zoning code by the Boston Zoning Commission to include Net Zero Carbon (NZC) Zoning. This new zoning will introduce decarbonization requirements for development projects that accelerate progress on the City’s goal of being carbon-neutral by 2050. 

Under NZC, most new large buildings permitted and delivered will emit net zero carbon emissions from the day they open. 

“Around the world and here at home, the dangers of climate change are clear and intensifying. To protect families across our neighborhoods and keep our city running, we need urgent action to ensure resiliency for the safety and well-being of all Bostonians,” said Mayor Michelle Wu in a statement. “By embedding sustainability into new projects, we set Boston on a direct path towards a cleaner and healthier future for generations to come.” 

Buildings account for nearly 71% of the community’s carbon emissions, and by adjusting operational performance requirements of new buildings, Boston can minimize emissions and its impact on climate. This includes reducing energy use, easing our reliance on fossil fuels, increasing electrification, and using renewable energy sources. 

NZC Zoning introduces a net zero emissions standard for new project filings after July 1, 2025, with 15 units or more, a minimum of 20,000 square feet, or additions of a minimum of 50,000 square feet or more to existing buildings. Projects will demonstrate compliance with this standard during Article 80 Development Review moving forward. 

Recognizing the energy and ventilation needs of labs and hospitals, new labs will be required to meet net zero emissions by 2035 and new hospitals and general manufacturing buildings must meet net zero emissions by 2045. 

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