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Passive house
Passive house (Passivhaus) is a voluntary building performance standard for very high energy efficiency and thermal comfort that substantially reduces a building’s carbon footprint. Buildings certified to the standard are ultra-low energy and typically require very little energy for space heating or cooling. The approach is used for housing and for non-residential buildings such as offices, schools, kindergartens and healthcare facilities. Energy efficiency is integral to architectural design rather than an add-on. Although most common in new construction, the principles are also applied in deep renovations (see EnerPHit).
As of January 2025, projects certified by the Passive House Institute (PHI) comprise over 47,400 units with about 4.32 million m² of treated floor area (TFA) worldwide; the public PHI database lists nearly 6,000 projects. In North America, the Passive House Institute US (PHIUS) reported 500+ total certified projects and ~1.6 million ft² certified in 2024 alone, with 4.4 million ft² design-certified that year. While early adoption concentrated in German-speaking countries and Scandinavia, certified projects are now documented across diverse climate zones, including hot-humid and tropical regions.
The term passive house was used in the 1970s for buildings emphasizing passive solar strategies; since the 1990s it denotes meeting the quantified PHI certification criteria (space conditioning, primary energy, airtightness and comfort requirements). The standard originated from a 1988 discussion between Bo Adamson (Lund University) and Wolfgang Feist (then at the Institute for Housing and Environment, Darmstadt), followed by research supported by the state of Hesse.
North American “superinsulation” pioneers of the 1970s (e.g., the Saskatchewan Conservation House and the Leger House) provided important technical precursors, including heat-recovery ventilation and airtightness testing.
Four terraced houses in Darmstadt-Kranichstein (1990–1991) are widely cited as the first built to what became the Passive House standard.
The Passivhaus-Institut (PHI) was founded in 1996 in Darmstadt to develop, promote and certify to the standard. By 2010 an estimated 25,000+ Passive House buildings existed worldwide.
The concept has since been demonstrated at scale. Gaobeidian, China, hosts what is reported as the world’s largest Passive House development (Railway City), with several hundred thousand m² of certified area built in phases since 2019. The world’s tallest certified Passive House building is the 88 m Bolueta tower in Bilbao, Spain (2018).
In the United States, Katrin Klingenberg’s 2003 “Smith House” (Urbana, IL) catalyzed a movement that led to the creation of PHIUS (2007). PHIUS has since certified hundreds of projects; New York City’s Park Avenue Green (2019) was recognized as North America’s largest Passive House affordable housing project at the time.
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Passive house
Passive house (Passivhaus) is a voluntary building performance standard for very high energy efficiency and thermal comfort that substantially reduces a building’s carbon footprint. Buildings certified to the standard are ultra-low energy and typically require very little energy for space heating or cooling. The approach is used for housing and for non-residential buildings such as offices, schools, kindergartens and healthcare facilities. Energy efficiency is integral to architectural design rather than an add-on. Although most common in new construction, the principles are also applied in deep renovations (see EnerPHit).
As of January 2025, projects certified by the Passive House Institute (PHI) comprise over 47,400 units with about 4.32 million m² of treated floor area (TFA) worldwide; the public PHI database lists nearly 6,000 projects. In North America, the Passive House Institute US (PHIUS) reported 500+ total certified projects and ~1.6 million ft² certified in 2024 alone, with 4.4 million ft² design-certified that year. While early adoption concentrated in German-speaking countries and Scandinavia, certified projects are now documented across diverse climate zones, including hot-humid and tropical regions.
The term passive house was used in the 1970s for buildings emphasizing passive solar strategies; since the 1990s it denotes meeting the quantified PHI certification criteria (space conditioning, primary energy, airtightness and comfort requirements). The standard originated from a 1988 discussion between Bo Adamson (Lund University) and Wolfgang Feist (then at the Institute for Housing and Environment, Darmstadt), followed by research supported by the state of Hesse.
North American “superinsulation” pioneers of the 1970s (e.g., the Saskatchewan Conservation House and the Leger House) provided important technical precursors, including heat-recovery ventilation and airtightness testing.
Four terraced houses in Darmstadt-Kranichstein (1990–1991) are widely cited as the first built to what became the Passive House standard.
The Passivhaus-Institut (PHI) was founded in 1996 in Darmstadt to develop, promote and certify to the standard. By 2010 an estimated 25,000+ Passive House buildings existed worldwide.
The concept has since been demonstrated at scale. Gaobeidian, China, hosts what is reported as the world’s largest Passive House development (Railway City), with several hundred thousand m² of certified area built in phases since 2019. The world’s tallest certified Passive House building is the 88 m Bolueta tower in Bilbao, Spain (2018).
In the United States, Katrin Klingenberg’s 2003 “Smith House” (Urbana, IL) catalyzed a movement that led to the creation of PHIUS (2007). PHIUS has since certified hundreds of projects; New York City’s Park Avenue Green (2019) was recognized as North America’s largest Passive House affordable housing project at the time.