About
The engineer, accountant, and real estate broker behind UnityHaus — and why I'm building a Passive House ADU in public.
I've spent my career looking at homes from the outside in. I started as an engineer in South Korea, moved to Canada for an MBA, earned my CPA, and spent years as a corporate accountant and financial advisor to high-net-worth families. Along the way I became a real estate broker in Durham Region. Each role gave me a different vantage point on the same problem: why so many homes quietly fail the people who live in them — drafty, expensive to run, loud, and uncomfortable in ways their owners learn to tolerate.
The deeper I looked, the more convinced I became that there's a better way to build — and that it isn't a secret. It's Passive House: a building-science standard that uses up to 90% less heating and cooling energy than a code-built home while delivering cleaner air, steadier temperatures, and near-total quiet. To move from admiring it to actually doing it, I earned my CPHT — Certified Passive House Tradesperson — so I could understand every assembly, junction, and number for myself rather than taking a contractor's word for it.
UnityHaus is where that conviction becomes a company. We design and build luxury, high-performance accessory dwelling units — homes that let families keep aging parents or adult children close without sacrificing privacy, comfort, or independence. Our first project, NamuHaus, is a real Passive House ADU now under construction in Oshawa, Ontario. It's built to the Passive House standard and verified by energy modelling and a blower-door test — a working proof of concept, not a brochure.
Where I'm headed is bigger than one backyard. My goal is a homebuilding company built on panelized prefabrication, complemented by 3D volumetric modules for kitchens and bathrooms — so high-performance homes can be built faster, more precisely, and with far less waste than conventional construction allows.
This journal is me building that future in the open — design decisions, permit timelines, construction notes, energy results, and the mistakes I'd rather you learn from than repeat. If you're thinking about a high-performance home of your own, follow along.