What: Passive House Standards
Passive House applies to all building types and can fit any architectural style. (Don't be fooled by the "house" in the name...in the german Passivhaus, the “haus” connotes “building”.) A Passive House can be an apartment block, a school, a museum, a firehouse, a retail store, a hospital, an industrial facility, a high-rise office tower…pretty much any building type you can imagine.
The Passive House approach is perfect for larger buildings because they have inherently more efficient geometries: as a form gets larger, the ratio of its surface area to its volume decreases. For a larger building, that means that the ratio of its envelope (walls, roof, and foundation) to its interior (the spaces that need to be thermally conditioned) decreases. Because Passive House is an envelope-first approach to high performance building, this lower ratio of envelope to interior space makes it easier to achieve Passive House performance in larger buildings. Passive House Intro | Why: Passive House Benefits | How: Passive House Design Principles
In North America, two distinct and independent Passive House standards and certifications are available: one administered by Passive House Institute (PHI, based in Darmstadt, Germany) and the other administered by Phius (based in Chicago, Illinois). (The two organizations are not affiliated with one another.) Each group offers a basic Passive House certification, Passive House net zero options, and a retrofit certification.
The two standards differ in important ways, including Phius’ approach of adjusting a given project’s performance targets based on the climate of that project’s site. Nevertheless, the standards share important commonalities: both focus on three key performance metrics (see below); both standards are firmly grounded in building science and building physics; and both standards require practitioners to employ a common suite of Passive House design principles to achieve their performance targets. To learn more about certification details, please visit PHI and Phius.