Last month, the U.S. Department of Energy (DOE) announced a National Definition of a Zero Emissions Building to advance public and private sector efforts to decarbonize the buildings sector, which is responsible for more than one-third of total U.S. greenhouse gas emissions. According to DOE, the definition is intended to provide industry guidance to support new and existing commercial and residential buildings to move towards zero emissions across the entire sector and help the nation cut home and business energy costs. A standardized definition for zero emissions buildings will help advance next-generation clean energy solutions, drive innovation and tackle the climate crisis, while supporting workforce development.

DOE reports that there are nearly 130 million existing buildings in the U.S., which collectively cost over $400 billion a year to heat, cool, light and power, with 40 million new homes and 60 billion square feet of commercial floorspace expected to be constructed between now and 2050. One in four American households — and 50% of low-income households — struggle to pay their energy bills. "Establishing a consistent definition for a zero-emissions building will accelerate climate progress while lowering home and business energy bills. Additionally, the zero-emissions definition provides market certainty and clarity to scale zero emissions new construction and retrofits," DOE said in its news release.

For mechanical and plumbing engineers, having a standardized national definition of zero-emissions building is not just beneficial — it is essential.

A national definition helps provide consistency in design and implementation. Without a clear, standardized definition, engineers across different states or regions might adopt varying criteria and benchmarks. This inconsistency can lead to discrepancies in design, performance, and sustainability outcomes. A national definition ensures that all professionals are working towards the same goals, using the same metrics and guidelines.

It can also streamline regulatory compliance. Engineers and builders must often navigate a complex web of local, state, and federal regulations. A single, national standard reduces confusion and streamlines the compliance process. This not only makes the engineering and construction process more efficient but also ensures that all buildings are held to the same high standards of sustainability.

And last but not least, achieving zero emissions in buildings requires collaboration across various disciplines, including architecture, structural engineering and environmental science. A national definition provides a common language and set of goals that all disciplines can work towards. This fosters better communication and collaboration, ensuring that all aspects of a building's design and operation contribute to its overall sustainability.

As the construction industry continues to evolve towards greater sustainability, having a clear, unified standard for zero emissions is not just important — it is indispensable. By embracing and advocating for a national definition of zero emissions buildings, mechanical and plumbing engineers can play a pivotal role in shaping a greener, more sustainable future.