A German-inspired energy efficiency standard known as Passive House, is gaining favor in the multifamily industry in Chicago, reports the Chicago Tribune.

Passive House design focuses on features such as triple-paned windows and wraparound insulation, as well as ventilation systems. The result is a reduced carbon footprint, improved air quality, and lower costs for tenants. The Passive House standard can lead to a 40%-60% reduction in energy, according to Phius, a Chicago-based nonprofit that certifies Passive House buildings.

Multifamily developers have begun to embrace Passive House amid industry changes and to comply with city and state building energy codes. There are seven Phius-certified multifamily developments underway or completed in the Chicago area, including the Fifth City Commons property.

Chicago’s building code was changed to accommodate the Passive House standard in 2022 with the adoption of the Chicago Energy Transformation Code, which allows Phius-certified buildings as an alternative method of compliance with building energy codes.