Project CO+OP

09/25/2026

Happening now. Retrofitting existing buildings is essential to enjoy a more sustainable and resilient built environment.

05/11/2026

Passive House Site Tour! Join me in Cushing, Maine, tomorrow (May 12) from 2-4 pm ET for a presentation and site tour of the Winchenbach-Gray Residence: https://buff.ly/WVZaXr6

Still under construction, the home has ideal solar orientation, high-quality windows, and generous insulation.

As the CPHC on the project, I was thrilled to see preliminary airtightness tests coming back well below Passive House requirements, and my energy modeling projects it will have an Energy Use Intensity (EUI) of -11 (or less!).

05/07/2026

Want to see a Passive House in progress? Come on out to Cushing, Maine, on May 12 for a presentation and site tour: https://buff.ly/WVZaXr6

Join me, the owners, the project team, and passivhausMAINE for the ultimate peek under the hood of this exceptionally high-performing (0.04 cfm50/sf) Passive House—free for phME members and $10 for everyone else.

Because it’s still under construction, you get to see the double-stud walls, thermal bridge-free transitions, exterior taping strategy, mechanical systems, and more.

Hope to see you there!

04/23/2026

Set in the heart of White Mountain National Forest, Clay Brook Passive House is the first Phius-certified single-family Passive House home in New Hampshire. Plus, it currently holds the record for the lowest HERS score (without renewables) in the country at 17!

I recently sat down with Jay Fox, of the Passive House Accelerator, to talk about my journey as an architect and the work we did to bring Clay Brook Passive House to life.

You can read the full article here ⇒

How a Maine-based team including Project CO+OP and Maine Passive House came together to build this Granite State milestone.

04/16/2026

Want an insider's look at the best in sustainability and building science resources, plus passive house strategies that actually work in the field? You’re in luck: I just started a newsletter!

You can sign up here ⇒ https://project.coop/newsletter

Over the years, I've been lucky enough to work with incredibly talented builders, architects, developers, and visionary clients in the high-performance space.

And now, I want to share what I’ve learned and what I’m seeing in the market right now with a broader audience. New episodes monthly.

Hope you’ll join me on the journey!

Newsletter Signup + Past Editions

04/12/2026

What an inspiring day! Project CO+OP represented at the Cooperative Maine Business Alliance’s Principle 6 conference, where we connected with many like-minded people and businesses—all endeavoring for a sustainable and resilient future.

02/13/2026

Housing policy fireside chat at

12/31/2025

https://buff.ly/DhkQ23N
Just as we wrap up 2025 the Maine chapter of the American Institute of Architects has shared a profile of our principal architect and sustainability consultant, Hans Breaux. Follow the link to learn more about what brought him to this vital work.

06/27/2025

The Maine sustainable building brain trust is here now at ScaleUp, CarbonDown: Housing & the Climate Emergency. Many thanks to for hosting us in the first certified manufacturing facility on the planet.

04/26/2025

We've got a special 'out-of-state' site walk coming up next month.

Join us May 16 in Gorham, NH, as we explore the state's first Phius-certified project, Clay Brook Passive House. We'll take a look at the project, designed by our friends at Project CO+OP and built by MainePassiveHouse, with consulting from L&L Engineering and Michael Brown of Advanced Building Analysis, LLC. Then we'll head to Big Day Brewing in Gorham to connect. FREE for phME members!

Register now to save your space: https://go.fabri.cc/claybrook