Durabuilt Windows and Doors is leading in innovation, performance, and sustainability
As it approaches its 40th anniversary, Durabuilt Windows and Doors (Durabuilt)continues to set the standard for high-performance window and door manufacturing in Canada. Recognized as ENERGY STAR Manufacturer of the Year 2025 and a 14-time winner of Canada’s Best Managed Companies, Durabuilt has built its reputation on innovation, operational excellence, and a people-first culture that drives long-term performance.
Originally founded as a custom PVC window and door manufacturer, Durabuilt was among the first Canadian companies to introduce a uPVC window and door system in 1988. Since then, the company has evolved into a full-scope manufacturer serving residential, multi-family, commercial, and industrial markets across Western Canada.
CEO Harry Sunner, who took over the business with his father in 1995, has led Durabuilt’s growth from 12 employees to more than 800 today, while maintaining a strong focus on culture, accountability, and long-term partnerships.
“At the end of the day, this business has always been about the people behind it,” says Sunner. “We’ve built Durabuilt by surrounding ourselves with strong teams, trusted partners, and customers who expect us to show up and deliver, year after year. Our culture is grounded in accountability, innovation, and respect – for our employees, our partners, and the communities we operate in. That’s what allows us to keep raising the bar and evolving as a business.”
Durabuilt’s product offering has expanded significantly over the years and now includes PVC windows, aluminum-clad PVC systems, commercial aluminum glazing, and a comprehensive library of doors ranging from exterior and hollow metal to steel and specialty applications.
“We’ve always been a forward-thinking company,” Sunner explains. “Today, we’re in a position where we can provide a window or door solution for almost any project type – whether it’s new construction or replacement, single-family, multi-family, high-rise, or industrial. In the vast majority of cases, Durabuilt has a solution that meets both performance and design requirements.”
One of the company’s most recent innovations is its Delta Fiberglass Window System, a luxury fiberglass product line developed to meet growing demands for larger openings, increased structural performance, and superior energy efficiency.
“Fiberglass is the next leader in the window and door space,” Sunner says. “In certain project types, it’s becoming a requirement due to size, compliance, and performance standards. Delta is positioned as a premium solution, and we’re seeing strong market adoption and growth as designers and builders look for higher-performing, more durable products.”
Sustainability and energy performance remain central to Durabuilt’s innovation strategy. In 2025, the company was named ENERGY STAR Manufacturer of the Year, a recognition Sunner describes as a significant milestone.
“ENERGY STAR is a national benchmark, and the companies recognized are truly leading-edge manufacturers,” he says. “We’re also a long-standing member of Built Green Canada, which means sustainability is built into how we design products and how we operate day-to-day. When we develop something new, we’re always looking at energy savings, recyclability, and long-term environmental impact.”
Research and development play a critical role in supporting both sustainability and innovation at Durabuilt. The company maintains a dedicated R&D team focused on product performance, evolving building codes, and emerging technologies. 
“Our R&D efforts range from incremental improvements to major advancements in building envelope performance,” Sunner explains. “We’re constantly evaluating where energy codes and compliance requirements are headed and making sure we’re ahead of those trends.”
Technology, automation, and robotics are increasingly integrated into Durabuilt’s manufacturing operations, allowing the company to maintain quality while scaling efficiently.
“Manufacturing is extremely competitive, and cost pressures continue to rise,” Sunner says. “Automation allows us to maintain a high level of quality and efficiency while supporting the scale we operate at today. It’s a capital-intensive business, but continued investment in technology is essential to delivering consistency and reliability for our customers.”
With its forthcoming 40-year milestone, Sunner credits Durabuilt’s longevity to resilience, disciplined execution, and leadership as the company scaled.
“Personally, I always had a vision of creating a huge legacy brand that will carry on forever,” he reveals. “We had very audacious goals on where we wanted to be one day, and that sheer focus was our pathway. There have certainly been struggles, where you start to think your dreams and aspirations are too big – but we didn’t stop. When you’re an entrepreneur, you continue through the dark days to reach your end goals. Then we reached 800 people, and it was no longer just about us – we had to be transparent and empowering in leading everybody. At Durabuilt, nobody is a number, but rather everyone here is treated with respect and care.”
Looking ahead, Durabuilt remains focused on continuing to invest in its people, technology, and customer experience as the business moves into its next phase of growth.
“As a business, we want to ensure we’re keeping up with automation, robotics, technology and digital platforms, all of which have developed rapidly over the past 20 years,” Sunner concludes. “We’ll be focusing not only on building new products and enhancing customer experience, but also on how AI and automation can make us more efficient in 2026 and beyond.”