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House Feature
A Century-Old Semi in Toronto Gets a Sustainable Makeover
Marianne and Luke Windisch take sustainability seriously. "We certainly both try to live sustainably," says Marianne Windisch. "We bike everywhere with the kids all year long. We do have a car, but it's electric. We generally try to minimize our environmental impact where we can. But we also believe in doing things well, once and for the long term."
With that last statement, she's referring to the family's home renovation, completed in 2018. Young and newly married, the couple purchased a circa-1920s semi-detached home in the Leslieville area of Toronto in 2012. They did enough repairs to live in the house comfortably for a while and had their first child. With their second child on the way, they knew it was time to get serious about adding insulation, fixing air leaks in the windows, and making sure they had adequate thermal comfort. The couple also realized they would soon need more space.
Since Marianne is a professor of building science and mechanical engineering at the University of Toronto, she knew what needed to get done. "While our design decisions made our home more sustainable, which aligned with our values, we also wanted to make sure we were making decisions that would suit our needs now and into the future," she says. "Particularly, as we start to see greater intensity and frequency of extreme heat events with climate change, we knew we needed systems that would minimize cooling energy use while still maintaining good thermal comfort when we needed it."
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By Camille LeFevre, Home Feature Editor
Mar 29, 2025 · 4 min read
They hired Greening Homes, a contractor specializing in sustainable renovations, also based in Toronto, to undertake the project.
Going Big for a New Old Home
To get the extra space they needed, Marianne and Luke decided to expand the third-floor attic. The couple got buy-in from the neighbors to retain the twinned appearance with the next-door semi (including the roof profile). They were able to increase not only the ceiling height but also the floor space.
Their new attic added 600 square feet to the home, for a total of 1,800 square feet. The third floor now includes an airy, open master bedroom with 14-foot ceilings and an ensuite bathroom, and a light-filled home office for Luke (general manager for a medical device company). The renovated second floor has two bedrooms and a bath for the kids.
How Did the Project Achieve Their High-Performance Envelope?
Because the new slightly higher peaked roofline in front, and a flat roof extending over the back, produced an increased heat-island effect, the flat roof and third floor were insulated with ROCKWOOL or other mineral wool products: Safe'n'Sound insulation on the party wall; Toprock DD on the roof and underlay for the vented roof; and Comfortboard 110 beneath the cladding. The contractors also installed vents and poured a reflective coating.
We figured we were only going to do this once, so we might as well do it properly.
Greening Homes installed fiberboard on the interior stud cavities, then insulated them with Densepack Cellulose. Cellulose is non-toxic as it's made from recycled material (paper products) and has low embodied energy. It also fills cavities that batt insulation cannot cover, as in behind electrical boxes.
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Decision-Making and Challenges
"I think the biggest challenge for Luke and I was trying to manage all of the decision-making alongside two full-time jobs," recalls Marianne. "It felt like every night we had to sit down and make what seemed like stressful decisions because they often involved spending more money. While we certainly spent more than we planned, we did so trying to take advantage of circumstances that would only present themselves during this renovation."
For example, she explains, "While the walls were open and the contractors were preparing to install insulation, we decided to fix awkward wiring or do a better job with the ductwork so the house was more air-tight and would perform better for us."
Home Feature Editor
Expert. Practical. Sustainable.
Article by
Camille LeFevre
Camille LeFevre is an architecture and design writer based in the Twin Cities.
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