Embodied Carbon and Your Next Project: Why It Matters More Than You Think
The Part of Carbon We Used to Ignore
Operational carbon paved the way for embodied carbon to become a significant focus. For years, the green building industry concentrated almost entirely on post-occupancy factors like heat loss, blower door scores, and those exciting PV arrays. While these elements remain important—air sealing will likely always be a priority—the conversation has evolved.
If you've spent any time in the Lounge, you've likely heard us say that embodied carbon is the next frontier. We can no longer design as if it's still 2010, with the HERS score as the sole metric of importance.
What We Mean by Embodied Carbon
Embodied carbon refers to all the greenhouse gas emissions associated with your building materials before anyone adjusts a thermostat. It's the carbon narrative that unfolds long before a house becomes warm, cool, or comfortable.
Consider the emissions from:
Extracting raw materials
Manufacturing and processing those materials
Shipping everything to the job site
Installing products and eventually dismantling them
This impact is embedded in every concrete footing, steel beam, spray foam application, and cladding choice, whether we acknowledge it or not. You can't measure it like electrical usage, but it remains a constant factor in every design decision.
Why Embodied Carbon Matters Right Now
Here's the uncomfortable truth: even the most net-zero, Passive House-certified, gadget-filled marvel has made its largest carbon impact the moment the ribbon is cut and the photos hit Instagram. While ongoing energy efficiency is crucial, a significant portion of the environmental impact has already occurred by then.
Buildings contribute significantly to global emissions, and for efficient homes, a large share of that impact comes from materials, not just operations over time. We don't have sixty years to wait for operational savings to offset a substantial carbon debt incurred on day one.
As Chris often says, "You can't solar panel your way out of poor material choices." It gets a laugh in a live room, but it resonates because we know it's true.
So What Do We Actually Do?
We frequently hear this question from clients and colleagues, often after a long pause and a deep breath. The solution isn't to stop building or to remain in perpetual analysis paralysis. Instead, it's about gradually steering projects in a better direction, one at a time.
Here's how we approach embodied carbon in our work and discussions in the Lounge.
Keep It Simple and Lean
Every additional material layer incurs costs in both money and carbon. When structures and assemblies are clean and simple, projects tend to become lighter in every sense.
We seek ways for one element to perform multiple functions, avoid unnecessary ornamental steel, and value-engineer with carbon in mind rather than focusing solely on cost.
Renovate When It Makes Sense
The greenest foundation is often the one that already exists. When a building has solid bones, there's usually a way to reimagine, retrofit, and reuse rather than demolishing everything.
Renovation introduces its own complexities and isn't always the right answer, but it deserves serious consideration before rushing to build anew.
Choose Lower Carbon Materials Where You Can
This is where specifications start to evolve. We look for opportunities to shift from concrete to wood or from high-impact products to lower-impact alternatives without sacrificing performance or durability.
It can be as simple as questioning the default spray foam note, requesting Environmental Product Declarations, and persistently inquiring with reps until you know what you're purchasing. Some days, the inquiries are less gentle, to be honest.
Design with the End in Mind
No matter how proud you are of a building on opening day, it will eventually be dismantled. When that happens, it can either become a future material bank or a significant landfill contribution.
Details that allow disassembly, products that can be reused or recycled, and assemblies that avoid unnecessary adhesives and mystery substances all help steer the project toward the first category.
Use the Tools You Have
Tools like BEAM, EC3, and Tally aren't perfect, but they're far better than guessing or ignoring the issue. They provide a way to identify carbon hotspots, adjust designs, and learn for future projects.
The Part Where It Gets Real
We understand. This is complex. Clients often care more about countertop finishes than carbon life cycle diagrams, and most days, you're juggling cost, aesthetics, spans, codes, and a looming deadline.
The temptation to dismiss one more variable is very real, and we've felt it ourselves. However, the carbon is present whether we acknowledge it or not, so choosing to ignore it is still a choice.
For us, this isn't about guilt or designing a mythical perfect building. It's about striving to improve with each project, through smarter detailing, more honest conversations, and material choices that make atmospheric sense.
It's rarely glamorous work. It's the quiet note on a spec, the extra call to a supplier, or the awkward moment when you explain to a client why a beloved product might not be suitable for their project.
That's the job now.
A Final Pour
Embodied carbon is invisible on day one, but its consequences will last for a long time. Performance doesn't truly begin at occupancy; it starts at the specification stage when the team decides what the building will be made of and how much carbon that decision will lock into place.
We created the Green Architects’ Lounge and this blog series, "Don't Be An Air Hole," because we're grappling with the same questions. Every time we swap a product, rethink a wall, or discuss a challenging trade-off on the podcast, we're trying to make a difference.
So here's to building lighter, one project at a time, one product swap at a time, and yes, one cocktail at a time.
