Big Win for Passive House: Washington State Passes HB 1183

HB 1183: A Key Step for Passive House in Washington

Washington State has recently passed HB 1183, a landmark bill aimed at supporting Passive House construction. This bill addresses major challenges in building energy-efficient homes by reducing barriers in local zoning and building codes. By making it easier to implement Passive House standards, Washington is paving the way for more affordable and sustainable housing.

With HB 1183, Washington becomes a leader in promoting green building practices and energy-efficient homes. These homes, built to Passive House standards, use up to 90% less energy for heating and cooling. As a result, they provide significant savings on utility bills while helping reduce carbon emissions statewide.

Key Features of HB 1183 for Passive House Construction

HB 1183 includes several important revisions that make it easier and more affordable to build Passive House projects. By addressing obstacles such as building height limits and setback requirements, the bill supports energy-efficient designs. Additionally, it helps developers and architects streamline their projects.

The changes are essential for making Passive House construction feasible in urban areas. They simplify the design process and reduce unnecessary costs, which makes it easier to prioritize energy performance without sacrificing affordable housing goals.

Key Changes in HB 1183

HB 1183 introduces several major changes to building regulations, aimed at supporting Passive House development:

• Wall Projections: Insulated walls can now extend 8 inches into setbacks, even for non-conforming buildings.
• Roof Height Increases: Buildings can exceed height limits by 8 inches to accommodate insulation; 4 feet for solar panels.
• Parking Requirements: Onsite parking is no longer mandatory for permit approval, making development more affordable.
• Facade Modulation: Facade modulation and upper-level setbacks are no longer required, reducing unnecessary costs.
• Floor Area Measurement: Floor area is now measured from the inside of drywall, making thicker walls acceptable.

These changes directly address the barriers that often make Passive House construction impractical, especially in densely populated cities. By relaxing restrictions, Washington State is taking an essential step toward energy-efficient, sustainable housing.

To find out more about how these changes impact building efficiency, find out more on Emu’s Building Science Blog.

Collaborative Efforts Behind the Bill

The passage of HB 1183 is the result of collaboration between various stakeholders, including Rep. Davina Duerr and experts like Rob Harrison, a Passive House consultant. Their combined efforts, along with input from Dan Bertolet and David Neiman, have made this bill a reality. As a result, Washington is now well-positioned to lead in sustainable housing.

By reducing regulatory hurdles and streamlining the process, HB 1183 is a major step forward in building a more energy-efficient and affordable future for Washington’s residents. This bill not only addresses the current needs but sets a precedent for future legislation in other states.