Retrofitting an old house into a Passive House is a challenging feat to say the least, but when done right, it can be amazing. When Bo and Itzy decided to turn their old Victorian home in Brooklyn into a passive home, they took on the ambitious project with help from NYC-based firm ZH Architects. The result is  powerhouse of energy-efficiency, redesigned and revamped for healthy living.

Continue reading below
Our Featured Videos

home interior with white walls and hardwood floors

Although the number of new passive home projects continues to grow, retrofitting old structures to fit Passive House requirements is still a massive undertaking rife with complications. In an interview with the architects, Bo explained that one of the biggest hurdles of their home renovation was making the space airtight.

Related: The United States’ first Passive Plus House generates nearly all the energy it needs

“Most passive houses have been either newly built or brownstone/townhouse conversions,” Bo said. “It’s a lot easier to get this right when dealing with a rectangular box or only two exposed walls with a flat roof. With an old Victorian home like ours, there are nooks and crannies everywhere. The hardest part is really getting the house airtight, so you need to work both from the inside and the out taking great care that you don’t have any air infiltration or gaps. We used an Intello vapor barrier on the inside of the attic and a Zip System on the exterior.” The home currently has an air tightness of about 0.29 ACH (air changes per hour) which, according to the architects, is a world record for a retro-fit building.

kitchen and dining area

Insulation was a big factor in creating an energy-efficient living space. The architects wrapped the home in extra layers of thick, eco-friendly insulation and installed high-performance windows to create a sealed envelope. Despite New York’s bitterly cold winters and severe summer heat, the interior will sustain a comfortable temperature throughout the year. To complement this level of comfort, the interior design is light and airy, with white walls and hardwood flooring to create an inviting space.

kitchen and dining area

For Bo and Itzy, having a passive home was not only about monetary and energy savings, but also to focus on creating a healthy living atmosphere. Along with the home’s many efficient features, the renovation avoided all VOC paints and harmful chemicals. Instead of using polyurethane for the flooring, they went with a natural Scandinavian lye treatment which includes using a natural mixture of oil and soap. The home was also installed with Energy Star-rated appliances, solar roof tiles and LED lighting.

attic sitting room with window

Of course, the process did mean making quite a few tough decisions about the home’s original features. For Itzy, the idea of getting rid of the large chimney was daunting, but by doing so, they were able to create an extra room in the attic. As another perk, they were able to install a wine cellar in the basement that uses an innovative concept for cooling. The heat pump water heater in the basement, which draws in warm air and blows out cool air, was redesigned to blow that cooler air into the wine cellar to keep the bottles cool. With this Passive House project complete, the residents and the architects hope to inspire others to take the time to retrofit old buildings for energy efficiency.

+ ZH Architects

Images via ZH Architects

Graphic chart of the home with information