About

This owner-occupied, phius-certified duplex is the dream home of part-time developers Faith and Jim Kumon. Their development company, Heirloom Properties, LLC, is dedicated to building middle-scale housing, prioritizing straight-forward design, and building with long-term operating costs in mind.

Find more information about Heirloom Properties on this website.

Special thanks to our team!

Sustainability Consultant: Mags Hawley, Electric Housing

Architect: David Walbolt, 10 Below Architecture

Phius CPHC (lead): Janneke Schaap, Perma Studio

Phius Certified Verifier: Michael Boerst

Big Ideas, Real Impact.

We participate in some of the leading organizations in energy sustainability, low-carbon construction, and healthy living.

First stacked duplex to achieve Phius Design Certification

Pilot project for Habitable’s Informed™ product guidance

Reimagine Buildings Collective

Proud member of the Reimagine Buildings Collective

Additionally, we have partnered with the following peer-led organizations to educate on the techniques, materials, and strategies of our passive building projects!