Project One

The standard

What is a Passive House?

A Passive House is built to be ultra-efficient. A certified Passive House can be up to 85% more efficient than a typical home, and can be heated with about the energy of a single hair dryer.

Most homes put looks first and barely meet code. A Passive House does the opposite. It puts performance first, and you don't give up the luxury to get it. Project One is the proof.

Gallery

Inside Project One.

The world's largest, certified.

Completed in August 2025, Project One is the world's largest PHIUS-certified Passive House, nearly double the previous record holder. It's the first home Cross built to prove that passive performance and custom luxury belong in the same home.

Certification is rare and hard to earn. As of September 2023, only 224 single-family homes in the United States had earned PHIUS certification, and only ten in Utah.

By the numbers

Performance you can measure.

Performance comparison of a code-minimum house versus Project One: air infiltration under 0.6 ACH, BTU consumption under 4,755 per square foot annually, energy usage under 11.1 kWh per square foot — Code-minimum house versus Project One: air infiltration, BTU consumption, and energy usage.

Awards

Winner of six awards at the 2025 Salt Lake Parade of Homes.

People's Choice, Favorite Home
People's Choice, Best Kitchen
People's Choice, Best Primary Suite
People's Choice, Best Interior Design
Judges' Choice, Sustainability
Eagle Award, for the most SLHBA subcontractors on the build

Five 2025 Salt Lake Parade of Homes award medallions won by Project One

View the home on the Salt Lake Parade of Homes

The payoff

Why certification matters.

Efficiency.

Up to 85% more efficient than a conventional home.

Energy independence.

Already close to net zero. Add solar or geothermal and the home can power itself, and an EV with it.

Comfort.

Even temperatures throughout. Fewer hot and cold spots, warm in winter and cool in summer.

Health.

Continuously filtered, mechanically ventilated air. Pollen, smoke, and pollutants stay outside.

Safety and durability.

Certified through rigorous third-party testing, and proven more resilient to wildfire, extreme heat, and cold.

Key features

Built right, from the slab to the roof.

Walls

Continuous insulated, airtight envelope with thermal-bridge-free detailing.

Roof

Deep insulation and a sealed assembly engineered for Utah snow loads.

Windows

Triple-pane, high-performance glazing, tuned per elevation.

Ventilation

Balanced HRV/ERV — filtered fresh air, continuously.

HVAC

Right-sized, ultra-efficient system; tiny load thanks to the envelope.

Water heating

Heat-pump water heating for minimal energy use.

Solar

Solar-ready; pairs with the envelope to approach net zero.

Certified, not just claimed.

RESNET, Residential Energy Services Network, HERS Index

PHIUS CORE certificate for Project One, certified August 2025 — The PHIUS CORE certificate for Project One.

Films

See it in motion.

Project One — Full Animation

Project One — Walk Through

Project One partners.

Walker Home Design

Jamie Walker · Architect

A Utah Best of State home designer; drew the plans for Project One.

Brach Design

Dave Brach · Passive House consultant

Among Utah's first and most experienced Certified Passive House Consultants; guided Project One's passive design.

The future of home,
built in Utah.

Contact us

The world's largestPassive House.