125 Haus, Park City, Utah
Atelier Jörg Rügemer
Park City, Utah

In designing this test house, which is also his family home, architect Jörg Rügemer, Assoc. AIA, set the bar extremely high—and moderately low. “We wanted to achieve the highest possible energy-efficiency goals at market-rate cost,” he explains. Rügemer, who teaches sustainable architecture at the University of Utah, was on familiar ground. Combining Passive House guidelines, exhaustive performance modeling, and creative detailing, he produced an extraordinary house on the most ordinary of budgets.

R-values of 45, 60, and 80 (for the floor slab, walls, and roof, respectively) and a full wrap of rigid foam insulation to eliminate thermal bridging keep the house warm in winter, with minimal energy inputs beyond passive solar gain. Located in ski country at 7,000 feet above sea level, the house costs less than $300 per year to heat and cool. Spare interior detailing furthers both economic and aesthetic programs. “Cool,” is how one juror responded. “I’d live there.”

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Project Credits

Principal in charge/interior designer: Jörg Rügemer, Assoc. AIA, Atelier Jörg Rügemer, Park City, Utah
General contractor: Bryson Garbett, Garbett Homes, Salt Lake City, Utah
Project size: 2,400 square feet
Site size: 0.37 acre
Construction cost: $118 per square foot
Photography: Scot Zimmerman

Product Details

Bathroom cabinets: Duravit duravit.us; Sonia sonia-sa.com/en
Bathroom fittings: Grohe grohe.com/us
Bathroom fixtures: Duravit duravit.us; Sonia sonia-sa.com/en/
Cooktop: Bauknecht whirlpoolcorp.com/brands/bauknecht.aspx
Countertops: PaperStone paperstoneproducts.com
Dishwasher: Siemens usa.siemens.com/entry/en
Flooring (ceramic): Villeroy & Boch villeroy-boch.com/en/us
Flooring (other): Polished concrete, 3- and 4-inch wide red birch planks
Garage doors: Amarr amarr.com
Hardware: Inox Aurora unisonhardware.com
Gas fireplace: Montigo montigo.com
HVAC equipment: Navien navienamerica.com; Venmar USA venmarusa.com
Insulation: 11 inches of Fiberglass, 4 inches of EIFS with stucco
Kitchen cabinets and fixtures: Ikea ikea.com/us
Kitchen fittings: Grohe grohe.com/us
Oven: Bauknecht whirlpoolcorp.com/brands/bauknecht.aspx
Paints/stains/wall finishes: American Pride southerndiversifiedproducts.com/pride.html
Refrigerator: Siemens usa.siemens.com/entry/en
Windows: Cascadia cascadiawindows.com; Serious Windows seriouswindows.com