This home was designed by the talented architecture firm Kaplan Thompson Architects of Portland, Maine, and conceived to perform at the highest level of residential construction—achieving Passive House certification.
The home is constructed as a true envelope house, utilizing a double-stud wall system with two independent exterior walls that create a 12-inch cavity for continuous, high-performance insulation. The roof assembly incorporates energy trusses, fully dense-packed for maximum thermal performance.
Extreme attention was given to airtightness, with meticulous taping at every penetration both inside and out. A vapor-open wall and roof assembly, triple-glazed windows, solar integration, and refined architectural detailing result in a home that is as beautiful as it is efficient.
The owners enjoy net-zero energy consumption, exceptional indoor air quality provided by a Zehnder ERV/HRV ventilation system, and a rooftop solar array that produces enough net-metered energy to eliminate utility bills entirely. The home achieved an outstanding 0.43 ACH, the lowest air exchange rate ever recorded by our certifier—well beyond the Passive House standard of 1.5 ACH.
This residence was recently honored with the 2025 PHIUS Passive Single Family Home of the Year award for the United States, making it one of our proudest and most meaningful projects to date.