Ask an Architect: What Does Sustainable Design Actually Mean?
Architect Wayne Turett explains what makes a home sustainable, why energy efficiency is only part of the equation, and how homeowners can approach sustainable design in ways that make sense for their homes and priorities.
When homeowners talk about sustainable design, they're usually thinking about energy efficiency. They want a home that uses less energy, costs less to operate, and has a smaller environmental footprint. Those are all important goals, but sustainability encompasses much more than that.
As an architect, I think about sustainability in a much broader sense. It includes the materials we use, how much waste we generate during construction, water conservation, indoor air quality, and even the landscaping surrounding a home. Ultimately, sustainable design is about making thoughtful decisions that reduce our impact on the environment while creating healthier, more comfortable places to live.
The Different Benefits of Sustainable Design
One of the most important things to understand about sustainable design is that not every decision serves the same purpose.
Some improvements have a direct financial benefit. Better insulation, high-performance windows, and more efficient heating and cooling systems can reduce energy consumption and lower utility bills over time.
Others primarily improve the experience of living in a home. In a Passive House or other low-energy building, for example, an energy recovery ventilator (ERV) can continuously introduce filtered fresh air without requiring homeowners to open their windows. Combined with a well-insulated building envelope and efficient mechanical systems, this can create a more comfortable and consistent indoor environment.
Then there are decisions whose benefits are primarily environmental. Choosing recycled materials, reducing construction waste, or selecting products with lower embodied carbon may not produce a measurable reduction in your monthly expenses, but those choices still have value.
I think there's also a personal benefit to knowing you're doing something positive for the environment. As people become more aware of climate change and our collective impact on the planet, that sense of responsibility becomes part of the motivation for building sustainably.
These different benefits all contribute to how we should think about the return on investment.
Some decisions offer ongoing financial savings, some improve comfort and well-being, and others reduce environmental impact. Many accomplish more than one of those goals.
Thinking About the Home as a Complete System
The greatest opportunities for improving energy efficiency often come from understanding how different parts of a building work together.
Insulation, windows, air sealing, heating and cooling, ventilation, and lighting all contribute to a home's overall performance. Improving the building envelope, for example, reduces heat loss in winter and unwanted heat gain in summer. That can reduce the amount of energy needed to maintain a comfortable temperature.
Modern mechanical systems can take advantage of those improvements. With efficient heat pumps and variable-output heating and cooling systems, homeowners may barely notice when the equipment is operating because the interior temperature remains so consistent.
Technology also makes it possible to coordinate lighting, shading, heating, and cooling through integrated controls, giving homeowners greater control over their indoor environment.
But not every sustainable decision has to be part of a comprehensive mechanical strategy. Selecting materials with lower embodied carbon, for instance, reduces environmental impact during construction. Unlike energy-efficient equipment, which continues providing benefits throughout its operation, much of the environmental benefit of material selection is realized when those materials are produced and installed.
Both approaches matter, even though they contribute to sustainability in different ways.
Different Homes, Different Opportunities
The opportunities for sustainable design depend considerably on the type of building you're working with.
When designing a new freestanding home, we have the greatest degree of control. We can consider solar orientation from the beginning, position windows to manage sunlight and heat gain, and design the building envelope to minimize energy loss.
Renovating an existing New York City townhouse presents different challenges. The building's orientation is already established, and its exposure is limited by neighboring structures. We have to work within those conditions, but there's still a great deal we can accomplish. Improving insulation and replacing inefficient windows can have an especially significant impact on energy performance.
The extent of these improvements often depends on the overall scope of the renovation, particularly whether the project involves a full gut renovation or more limited alterations.
In an apartment, there's even less control over the building as a whole. But homeowners can still make meaningful choices about lighting, mechanical equipment, interior materials, and products that contribute to healthier indoor air quality.
My philosophy is to do what you can. Not every project has the budget or the opportunity to pursue every sustainable strategy, and that's perfectly reasonable. Improving one aspect of a home is better than making no improvements at all.
Where Does Passive House Fit In?
Passive House is one of the more rigorous approaches to energy-efficient building design. It establishes specific performance standards intended to dramatically reduce the energy required to heat and cool a building.
But you don't necessarily need to pursue Passive House certification to benefit from its principles.
For my own home, I incorporated Passive House strategies without pursuing formal certification. The goal was to create a highly efficient, comfortable building, and those principles were valuable regardless of whether the house received an official designation.
Certification can be important in other circumstances. For a multifamily development, for example, independently verifying the building's performance can provide valuable assurance to prospective buyers.
The broader point is that high-performance design isn't an all-or-nothing proposition. You can apply many of the same ideas to an existing home without necessarily meeting every requirement of a particular certification program.
Does Sustainable Design Cost More?
In my experience, sustainable construction often does cost more upfront, although the difference may be smaller than people expect.
Part of that comes down to how buildings are constructed. Some high-performance methods are still less familiar to contractors, and introducing different materials or construction techniques can increase costs. As those practices become more widespread, I expect that gap to narrow.
There are also opportunities to recover some of that initial investment. A highly insulated, airtight building requires less energy for heating and cooling, which can reduce operating costs over the life of the home. In some cases, it can also allow for smaller mechanical systems.
But I wouldn't evaluate every sustainable decision strictly in terms of how quickly it pays for itself.
If you choose a recycled material or a product with a lower environmental footprint, the return may not appear on a utility bill. Similarly, the value of filtered fresh air, consistent indoor temperatures, or a healthier interior environment can be difficult to quantify financially.
I think homeowners should consider all of those benefits when deciding how much to invest. Energy efficiency can offer a measurable financial return, but comfort, well-being, and environmental responsibility are equally legitimate goals.
And as energy prices continue to rise, homes that require less energy to operate may be better positioned to manage those costs over time.
Sustainable Design Is a Process, Not a Product
One misconception about sustainable design is that it involves purchasing a particular collection of products or technologies. Install solar panels, buy efficient appliances, choose environmentally friendly materials, and suddenly you have a sustainable home.
In reality, it's much more involved than that.
Every building has its own conditions, limitations, and opportunities. Every homeowner has different priorities and a different budget. The right approach begins with understanding those factors and identifying where improvements will have the greatest impact.
That's why I encourage homeowners interested in sustainability to speak with an architect who has experience with high-performance design early in the process.
I've often said that sustainable design is a process, not a product. You're not simply selecting features from a catalog. You're making a series of interconnected decisions about how your home will function, how it will feel, and how it will affect the environment around it.
You don't have to do everything to make a difference. The important thing is to understand the opportunities available and make thoughtful choices about which ones matter most to you.
Read More About Wayne Turett's Passive House.
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Wayne Turett is the founder and principal of The Turett Collaborative, a New York–based architecture and interiors firm.
