Passive House (Passivhaus)
A voluntary building performance standard originating in Germany that achieves ultra-low energy consumption - typically reducing heating and cooling demand by up to 90% - through superinsulation, airtight construction, high-performance glazing, thermal-bridge-free design, and mechanical ventilation with heat recovery.
Building & ConstructionThe Passive House concept was developed in the late 1980s by Dr. Wolfgang Feist (Germany) and Professor Bo Adamson (Sweden). The first Passive House was built in Darmstadt, Germany in 1991 and has been continuously monitored since, consistently confirming the standard’s performance. The concept is managed by the Passive House Institute (PHI) in Darmstadt.
The term “passive” refers to the reliance on passive design strategies - insulation, orientation, solar gain, heat retention - rather than active mechanical systems.
The Five Principles
- Superinsulation: Walls, roofs, and floors insulated far beyond conventional standards (U-values of 0.10–0.15 W/m2K), dramatically reducing heat loss
- Airtight construction: Air leakage not exceeding 0.6 air changes per hour at 50 Pa of pressure, verified by blower door testing
- High-performance windows: Triple or quadruple-glazed with low-emissivity coatings, inert gas fills, and thermally broken frames (whole-window U-values of 0.80 W/m2K or better)
- Thermal-bridge-free design: All junctions designed to eliminate points where heat can bypass insulation
- Mechanical ventilation with heat recovery (MVHR): Continuous fresh air supply while recovering 75%+ of heat from exhaust air
Performance Criteria
- Space heating demand: no more than 15 kWh/m2 per year
- Total primary energy demand: no more than 120 kWh/m2 per year
- Airtightness: n50 of 0.6 ACH or less
Applications
The standard works for all building types - residential, commercial, educational, healthcare, and industrial - and in all climate zones, from subarctic Scandinavia to subtropical Asia, with parameters adjusted for local conditions.
Why It Matters
Buildings are responsible for approximately 40% of energy consumption and 36% of CO2 emissions in the EU. Passive House demonstrates that it is technically possible to reduce building energy demand by up to 90% using established construction methods. As the EU tightens energy performance requirements through the Energy Performance of Buildings Directive (EPBD), Passive House principles are increasingly reflected in regulatory standards. For green building professionals, energy auditors, and architects, Passive House represents the gold standard in energy-efficient design.