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The World's Largest Single-family, PHIUS-certified, Passive House Home
An energy-efficient, luxury home with a picturesque view
Project One
Project One is the largest single-family, PHIUS-certified, Passive House home in the world, setting a new standard for sustainable luxury living. Designed and built by Cross Construction, this 14,953 sq. ft. (1390 sq. m.) residence in Bluffdale, Utah integrates advanced building science with refined aesthetics. Achieving PHIUS CORE 2021, DOE Zero Energy Ready Home, and EPA Indoor airPLUS certifications, the home demonstrates that ultra-efficiency and high-end design can coexist. Through a tightly coordinated system of insulation, geothermal heating, solar energy, and high-performance ventilation, Project One achieved a HERS score of 30 and net-zero readiness.
14,953 sq. ft.
Interior Conditioned Floor Area
5,375 kWh/person.yr
Annual Energy Consumption (with renewables)
6 HRVs
Integrated with geothermal loops, the HERO 250H-EC provides occupants with balanced, whole-house ventilation
Maximum Thermal Efficiency
Project One’s envelope is engineered for maximum thermal efficiency. The roof achieves R-60 insulation, below-grade walls reach R-32, and Alpen triple-pane windows offer U-values as low as 0.14. These components work together to minimize energy loss and maintain comfort year-round.
Solar + Geothermal Synergy
A 25 kW solar PV system offsets the home’s low energy use intensity (EUI) of 6.35 kBTU/ft²·yr, generating nearly 20,000 kWh/year. Combined with a geothermal heating and cooling system and a CO₂-based heat pump water heater, the home is electrification-ready and net-zero capable.
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Learn more about the world's largest Passive House!
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HERO
ERV/HRV for balanced ventilation in single- and multi-family homes