This project was CO Adaptive’s first Passive House retrofit of an old Brooklyn townhouse. Conceived as a two-family house, it allows the primary owners to share the Passive House living experience with out-of-towners, alongside the flexibility to have additional space for family and friends when needed. The upper duplex has three bedrooms on the second floor, with their kitchen and living room on the parlor level, alongside a new stair that gives access to the rear yard from the kitchen and dining area. A new powder room and laundry closet was added into existing interstitial closet space on the parlor level, and the sole heating and cooling system for the duplex is housed above those utility spaces.
The design contrasts the reuse of many original elements of the house with clean maple-ply details at doors and windows throughout, and a bright color palette which brings a contemporary feeling to the old house. The envelope was substantially insulated on the interior of the building and new triple-pane windows were installed. Operable exterior shades were tucked behind the existing brownstone, allowing them to disappear from view when open and mitigate solar heat gain when closed. Together these interventions keep the building cool with minimal mechanical intervention, even during the ever-hotter summers of New York City.