Do the right thing when nobody will see it
Most of what decides how a building performs ends up buried behind finishes. Those are the details that matter most.
About us
We design, manufacture and build high-performance homes
Quantum Passivhaus is a family-run Canadian company. We make prefabricated wall, roof and floor panels in our own factory in Minden, Ontario, and we build complete homes with them — homes that use a fraction of the energy and stay comfortable through a Canadian winter.
Family-runOwned and operated by
Abby Xerri and Angie Horner
Abby Xerri and Angie Horner
Minden, OntarioDesigned, engineered and
manufactured on site
manufactured on site
Since 2017Building across Ontario
and beyond
and beyond
PHI certifiedComponents certified for
cold and cool climates
cold and cool climates
Our story
Why Abby and Angie started Quantum
Abby Xerri has been in construction since he was thirteen — forty-five years now. Angie Horner is an ecologist. They're married, and they still own and run the company.
Quantum began in 2017 with a shared conviction that the construction industry could do better. Better comfort. Better energy performance. Better durability. Better building science.
The knowledge to build this way already existed. Passive House had been proving it around the world for decades. What was missing was a practical way to bring that level of performance into everyday Canadian construction.
So Abby and Angie started Quantum.What began with a handful of high-performance homes in Haliburton County grew into a team of designers, builders, engineers, tradespeople and manufacturing professionals working together under one roof.
Since then we've built homes, developed our own prefabricated building systems, trained trades and taken on everything from new construction to complex retrofits.
But the reason behind it hasn't changed: we believe people deserve buildings that are comfortable, healthy, durable and built for the long term.
Everyone should be able to have this. That's always been the vision.
Abby Xerri, Founder
Family-run
Family-run means something to us
Quantum is still a family-run business. That shapes how we think about our company, our team and the buildings we put our name on.
We're building homes where other families will raise children, gather around kitchen tables, retire, weather storms and spend decades of their lives. That makes the work personal.
It means caring about details that will sit hidden behind a wall long after construction is finished. It means having the difficult conversation when something needs solving. And it means taking responsibility for the quality of what we leave behind.
We don't expect every project to be perfect. We do expect ourselves to be accountable.Say what you mean
Straight answers about cost, timeline and trade-offs — including the ones you'd rather not hear. That's how trust gets built.
Build for the next generation
A home shouldn't just outlast its warranty. It should be something worth keeping, and worth handing on.
Heritage recognition award
Recognised for adaptive reuse and sustainable design
Keeping an existing building standing and making it perform better than it ever has is harder than starting again from nothing. It's also the work we're proudest of.
Where we're from
Made in Minden, Ontario, Canada
Our roots, our people and our manufacturing are here. Building in Minden lets us employ and train people in our own community, keep direct oversight of what leaves the factory, and keep developing systems for the realities of Canadian construction.
Cold winters. Hot summers. Remote sites. Short building seasons. Long distances. We know those conditions because they're our conditions too.
Made in Canada. Proud to be Canadian.
Everything we ship is made here No imported building system. No overseas factory.
Our team
The people behind Quantum
Buildings don't get designed, engineered, manufactured or constructed by a logo. Quantum brings together backgrounds in design, building science, manufacturing, construction, project development, finance and operations. Different disciplines, different personalities, one shared responsibility: make the finished building better.
Abby Xerri
President & CEOAbby leads Quantum with 45 years of construction experience and a decade pioneering prefabricated Passive House systems. His “innovation always” philosophy drives smarter, faster building solutions. Guided by faith and family, he's committed to empowering people and creating opportunity.
Email Abby
Angie Horner
Vice President & COOAngie co-founded Quantum in 2017 and now orchestrates operations as Vice President. From strategy to team coordination, she connects every moving part while keeping the culture collaborative and client-focused.
Email Angie
Jon Tesar
Director of OperationsJon oversees daily operations and the strategies behind them. A background in mechanical engineering and accounting, plus over ten years in manufacturing and fabrication, fuels a real passion for Canadian manufacturing.
Corey Bohnert
On-Site Quality Assurance ManagerCorey makes sure every build meets Passive House standards — site inspections, testing and meticulous documentation. Twenty years in building, now focused entirely on quality.
Stephanie Arce Zavaleta
Senior DesignerStephanie leads the creative and technical development of prefab Passive House projects, concept through production. A BCIN-accredited designer with a strong background in sustainable architecture.
Paul Caldwell
VP of FinancePaul oversees every financial matter at Quantum, with years as an auditor and CMA across multiple industries behind him. Married 44 years and a proud grandfather of seven.
Sue Smith Lohrbach
Bookkeeper & Assistant to VP of FinanceSue manages bookkeeping, payroll and administrative support, with over ten years of experience keeping Quantum running accurately. Outside work she's hiking, gardening and outdoors.
Katie Riley
Executive AssistantWith over twenty years in administration, Katie keeps schedules, communication and project flow moving across Quantum's leadership and office operations.
What happens next
Let's talk about what you're building
Planning a project, trying to understand how the building system works, or just curious about Quantum — we're happy to have the conversation. No pressure, and no obligation to build anything.