Archello Awards 2026 · Enter your projects before 30 September 2026
Archello Awards 2026 · Enter your projects before 30 September 2026

Passive House Retrofit

Sonoma Farmhouse

This unlikely candidate for the Passive House standard of efficiency began as a 1960’s house with uninsulated concrete slab. The home now uses the amount of energy it takes to run a hair dryer to heat the entire house. 


Washed in clean white, with a welcoming front porch and metal standing seam roof, this intuitive redesign centers on a bright, open-air courtyard that suits morning coffee for one and cocktails for a crowd. Inside, a tapering axis removes private rooms from view and rolling doors both optimize the space and separate uses. 


A 16-foot wide, sliding glass door fills the kitchen with light and maintains absolute silence, a testament to the extreme performance of super-insulation. Solar water panels, triple pane windows and energy-recovering ventilation further boost the comfort and energy efficiency, yielding a sensible beauty certain to inspire. 


This home was the first Certified Passive House in California and the first Certified Passive House retrofit in North America.

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