The Grass Isn’t Always Greener (Especially If It’s Astroturf In A New Development)

New builds vs. fixer-uppers: which is actually better for the planet?

I’m not in the market for a new house, but I spend an inordinate amount of time on Zillow like it’s my part-time job. I follow Zillow Gone Wild religiously and have mentally renovated approximately 47 kitchens I do not own.

On one hand: the shiny new build with the quartz countertops, induction stove, and suspiciously perfect fiddle leaf fig.

On the other: the slightly haunted 1960s ranch with “good bones,” one functioning bathroom, and the kind of charm that makes you think, I could fix her.

Naturally, I assumed sustainability would provide a clean tiebreaker here. Surely one option is obviously better for the planet?

Reader, unfortunately for both of us: not the case. 

The conversation around sustainable homes usually focuses on what’s inside the home: solar panels, Energy Star appliances, triple-pane windows, low-flow showerheads that make you question your life choices. But before you ever flip on a single light switch, the house itself has already racked up a pretty massive carbon tab. Depending on which path you choose, that tab can look very different.

THE BIG CONCEPT

Embodied Carbon: The Debt You Don’t See

Here’s the term you need to know: embodied carbon. It’s the carbon emitted during the extraction, manufacturing, and transportation of all the materials that go into building or renovating a home. Steel, concrete, lumber, drywall, insulation. Every 2x4 and bag of cement has a carbon cost before it ever becomes your kitchen wall.

Buildings and construction account for roughly 37% of global energy-related carbon emissions worldwide. Most climate conversations around housing have historically focused on operational carbon — the emissions from heating, cooling, and powering your home day-to-day. But as homes become more energy efficient, embodied carbon is becoming a much bigger piece of the puzzle. The World Green Building Council estimates that upfront embodied carbon could account for nearly half of a new building’s total carbon footprint between now and 2050. So what does that actually mean when you’re standing at the new build / fixer-upper crossroads?

NEW BUILDS

The Case For New Construction

New homes aren’t automatically the villain they’re sometimes made out to be. There are a few things they genuinely get right.

Energy efficiency at the point of construction is real and significant. New builds can be designed with superior insulation, heat pumps, induction cooking, EV charging, and smart energy systems baked in from the start. A well-designed new home can dramatically reduce operational emissions over its lifetime, especially if it runs on renewable electricity or includes rooftop solar.

Green building certifications like LEED and Passive House are also doing actual work here. LEED v5, launched last year, now requires that half its credits directly address decarbonization. That means more builders are incorporating lower-carbon concrete, sustainably sourced lumber, and longer-lasting materials instead of just tossing a recycling bin in the lobby and calling it “green.”

Location matters too.n A new mixed-use apartment building in a walkable neighborhood can have a far lower per-person carbon footprint than a beautifully renovated farmhouse 45 minutes from everything, requiring a car every time you forget lemons at the grocery store.

Bottom line: A thoughtfully-built new home in a dense, transit-accessible area can absolutely be the more sustainable option. The problem is that not enough new homes are actually built that way.

FIXER-UPPERS

Why Existing Homes Usually Win

A 2024 study analyzing more than one million Chicago buildings found that demolishing an existing structure in favor of a new one almost always creates more emissions overall.

The embodied carbon already locked into that old house is basically a sunk cost. The avocado bathroom tile may be emotionally challenging, but environmentally speaking, it’s already been paid for.

Renovation reuses the foundation, framing, walls, and infrastructure that already exist. That’s a huge carbon advantage before you even factor in the emissions from manufacturing entirely new materials.

Estimates vary widely, but building a new single-family home can generate tens of tons of embodied CO2 before anyone even moves in. Carbon accounting in construction is messy and imperfect, but the scale is real.

There’s also the issue of timing. Climate scientists keep reminding us that emissions reductions now matter more than hypothetical reductions decades from now. Retrofitting an existing home with better insulation, heat pumps, and solar can cut emissions immediately without the upfront carbon hit of starting from scratch.

The renovation path also tends to preserve something we don’t talk about enough: neighborhoods that already work. Older homes are often located in areas with mature trees, established infrastructure, public transit, and walkable streets. Greenfield suburban development, even when the homes themselves are efficient, usually comes with a much larger transportation footprint.

Bottom line: If the house already exists, the most sustainable version of it is usually the one that’s improved thoughtfully instead of bulldozed. 

THE NUANCE

It Depends (And Anyone Who Says Otherwise Hasn’t Done The Math)

Unfortunately, there’s no universal answer here. The variables matter a lot.

Here’s what actually moves the needle:

• Location and density: A new efficient apartment in a city will usually beat a renovated farmhouse 40 miles from anything.
• What you’re renovating: A gut renovation can still carry significant embodied carbon, especially if you’re replacing everything down to the studs. Strategic upgrades are often more climate-friendly than a teardown disguised as a “renovation.”
• The materials used: A LEED Platinum or Passive House project using mass timber and lower-carbon concrete is very different from a standard spec home with gray vinyl floors and six shades of greige.
• Your energy grid: Operational emissions depend heavily on where your electricity comes from. A super-efficient home on a coal-heavy grid may underperform a less-efficient home powered by cleaner electricity.
• Timeline: Embodied carbon is front-loaded. If you only plan to stay in a home for five years, a new build may never “earn back” its carbon debt. If it’s your forever home, the math changes.

There’s one more thing worth flagging: climate risk is quietly reshaping real estate values whether the housing market wants to talk about it or not.

Before buying anything, it’s worth understanding what risks the property itself faces over the next 30 years — flooding, wildfire, extreme heat, drought, all of it. We broke that down more in-depth in a companion piece here:

Read: Before You Buy: Understanding Climate Risk in Real Estate

WHAT YOU CAN DO

Practical Starting Points

If you’re buying a new build:

Ask annoyingly specific questions. Look for LEED, Passive House, or at minimum Energy Star certification. Ask about insulation, HVAC systems, window performance, and whether the home is all-electric. This is your permission slip.

If you’re buying a fixer-upper:

Start with air sealing and insulation first — these are often the highest ROI upgrades both financially and environmentally. Then move to heating/cooling systems and appliances. Many utility companies offer free or low-cost energy audits that will tell you exactly where your home is leaking money and energy.

For both:

Check climate risk data. Zillow and Redfin now surface flood, fire, heat, and climate-risk information directly on listings. An efficient home in a floodplain is still a floodplain.

And finally:

Ask about embodied carbon. Most builders still aren’t tracking it, but some are starting to. The more buyers ask, the harder it becomes for the industry to ignore.

At the end of the day, the “greenest” home is the one that minimizes emissions and supports a lifestyle less dependent on constant energy, driving, and consumption.

Which, unfortunately for my Zillow addiction, is not always the one with the waterfall connected to a lazy river and industrial-sized refrigerator.