Seattle Energy Code

The Seattle Energy Code is a construction code that ensures new buildings are efficient from the start. Every three years, the City of Seattle updates the energy codes that govern commercial and multifamily buildings to make them even more effective and move us toward a clean energy future. 

In February 2021, Mayor Jenny Durkan signed into law new updates to make Seattle's commercial energy code one of the strongest on climate in the nation. These code updates will go into effect March 2021. 

Why Energy Codes Matter:

Greenhouse gas emissions from Seattle's buildings continue to increase in large part due to the growth in new construction heated by dirty fossil fuels such as fracked gas. Pollution from fossil fuels degrades the air we breathe both indoors and out, especially for children, seniors, and BIPOC communities. Robust energy codes governing new commercial and multifamily buildings will protect our health and move us into a clean energy future.  

Commercial and large multifamily buildings are built to last. If we continue building with gas, we are essentially "locked in" to dirty fossil fuels in our commercial and taller multifamily buildings for decades. Getting it right the first time is the most economical path to a clean energy future. 

Energy Code Updates

This year, the City of Seattle updated its commercial energy code, which governs how new commercial and large multifamily buildings use energy. The new code also applies when buildings are undergoing major renovations, or when space and water heating systems are being replaced. Key updates include: 

  • eliminating gas from most water heating and space heating systems
  • improving building exteriors to improve energy efficiency and comfort
  • creating more opportunities for solar power  


The benefits for building owners and tenants are higher performing buildings and lower utility costs. These codes will also drive innovation that leads to new, green jobs and eliminates key sources of climate pollution. Electrified buildings keep residents and tenants safe from gas line leaks and explosions, as well as eliminating pollution and environmental hazards that occur at the drill site and during transportation of fossil fuels. Given the urgency of avoiding the most catastrophic impacts of climate change, any new buildings constructed with fossil fuels will need to commit financial resources to removing those fossil fuel uses within the next 25 years.

The updated energy code eliminates most direct carbon emissions from new and renovated buildings, which is our most economical opportunity to transition to clean electricity. Marginally increased construction costs will be repaid through reduced utility bills, and any additional upfront costs will decrease as industry adapts. For more information about the energy code updates, including the new code language, visit the Seattle Department of Construction and Inspections energy code web page.

By strengthening our energy codes today, we're ensuring our buildings are efficient from the start and investing in a healthier tomorrow.

The Seattle Department of Construction and Inspections (SDCI) is responsible for managing amendments to the energy codes.